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Observations of anthropogenic global warming

Archive for the ‘Global warming effects’ Category

New research, October 9, 2015

Posted by Ari Jokimäki on October 9, 2015

Some new papers from last few days:

Feedbacks on climate in the Earth system: introduction (open access)

The impact of parametrized convection on cloud feedback

Insights into low-latitude cloud feedbacks from high-resolution models

What does global mean temperature tell us about local climate? (open access)

The inconstancy of the transient climate response parameter under increasing CO2 (open access)

A simplified, data-constrained approach to estimate the permafrost carbon–climate feedback (open access)

Weighting climate model projections using observational constraints (open access)

Carbon cycle feedbacks and future climate change

Can cirrus cloud seeding be used for geoengineering?

Anticipating the Anthropocene (open access)

Foehn winds link climate-driven warming to ice shelf evolution in Antarctica

Relationship Between Sunshine Duration and Temperature Trends Across Europe Since the Second Half of the 20th Century

Long term cloud change imprinted in seasonal cloud variation: more evidence of high climate sensitivity

Blocking variability: Arctic Amplification versus Arctic Oscillation

Decadal variability in seawater pH in the West Pacific: Evidence from coral δ11B records

Effect of sea-ice melt on inherent optical properties and vertical distribution of solar radiant heating in Arctic surface waters

Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming

Connecting climate model projections of global temperature change with the real world

A minimum standard for publishing computational results in the weather and climate sciences

Sea level budget over 2005–2013: missing contributions and data errors (open access)

Parallelisms between sea surface temperature changes in the western tropical Atlantic (Guiana Basin) and high latitude climate signals over the last 140 000 years (open access)

Surface temperature dataset for North America obtained by application of optimal interpolation algorithm merging tree-ring chronologies and climate model output

Assessing the vulnerability of rare plants using climate change velocity, habitat connectivity, and dispersal ability: a case study in Alberta, Canada

Shallowness of tropical low clouds as a predictor of climate models’ response to warming

The thermal seasons variability in Poland, 1951–2010 (open access)

Daily gridded meteorological variables in Brazil (1980–2013)

Does climate directly influence NPP globally?

Direct radiative feedback due to biogenic secondary organic aerosol estimated from boreal forest site observations (open access)

Focus on high energy particles and atmospheric processes (open access)

Biogas: Clean Energy Access with Low-Cost Mitigation of Climate Change

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New research, October 5, 2015

Posted by Ari Jokimäki on October 5, 2015

Some new papers from last few days:

Russian anthropogenic black carbon: Emission reconstruction and Arctic black carbon simulation

Seasonality of tropical Pacific decadal trends associated with the 21st century global warming hiatus

North Atlantic meridional overturning circulation variations from GRACE ocean bottom pressure anomalies

Carbon isotope ratios suggest no additional methane from boreal wetlands during the rapid Greenland Interstadial 21.2

Using single-forcing GCM simulations to reconstruct and interpret Quaternary climate change

Identifying climatic drivers of tropical forest dynamics (open access)

A statistical analysis of three ensembles of crop model responses to temperature and CO2 concentration

Transition into a Hothouse World at the Permian–Triassic boundary—A model study

Climate change with elevation and its potential impact on water resources in the tianshan mountains, central Asia

Projected robust shift of climate zones over West Africa in response to anthropogenic climate change for the late 21st century

The North Atlantic Oscillation system and plant phenology

Recent climatological trend of the Saharan heat low and its impact on the West African climate (open access)

Impacts of urbanization on future climate in China

Velocity of temperature and flowering time in wheat – Assisting breeders to keep pace with climate change

Rapid warming in the Tibetan Plateau from observations and CMIP5 models in recent decades

Observed trend of diurnal temperature range in the Tibetan Plateau in recent decades

High spatial and temporal organization of changes in precipitation over Germany for 1951–2006

Loss of thermal refugia near equatorial range limits

A Third Wave in the Economics of Climate Change

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New research, September 30, 2015

Posted by Ari Jokimäki on September 30, 2015

Some new papers from last few days:

Southern Ocean buoyancy forcing of ocean ventilation and glacial atmospheric CO2

Projected changes to Tasman Sea eddies in a future climate

Organic carbon remobilized from thawing permafrost is re-sequestered by reactive iron on the Eurasian Arctic Shelf

Sensitivity of Soil Water Availability to Changing Snowmelt Timing in the Western U.S.

Contribution of increased Agulhas leakage to tropical Atlantic warming

Simulation of black carbon in snow and its climate impact in the Canadian Global Climate Model (open access)

CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps (open access)

To what extent could functional diversity be a useful tool in inferring ecosystem responses to past climate changes?

The impact of Indonesian peatland degradation on downstream marine ecosystems and the global carbon cycle

The complementarity and comparability of climate change adaptation and mitigation

Forest Biogeochemistry in Response to Drought

Reframing adaptation: The political nature of climate change adaptation

China’s air pollution reduction efforts may result in an increase in surface ozone levels in highly polluted areas

Ensemble flood risk assessment in Europe under high end climate scenarios

Power to change: Analysis of household participation in a renewable energy and energy efficiency programme in Central Australia

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New research, September 25, 2015

Posted by Ari Jokimäki on September 25, 2015

Some new papers from last few days:

The climate change consensus extends beyond climate scientists (open access)

Ice-core records of biomass burning

Recent decadal trends in global phytoplankton composition

Measuring glacier surface temperatures with ground-based thermal infrared imaging

Direct aerosol effects during periods of solar dimming and brightening hidden in the regression residuals: evidence from Potsdam measurements

Satellite observations of changes in snow-covered land surface albedo during spring in the Northern Hemisphere (open access)

Astronomical calibration of the geological timescale: closing the middle Eocene gap (open access)

Ice sheet mass loss caused by dust and black carbon accumulation (open access)

Avoided climate impacts of urban and rural heat and cold waves over the U.S. using large climate model ensembles for RCP8.5 and RCP4.5

Recent climatic changes in Romania from observational data (1961–2013)

Cyclones and their possible changes in the Arctic by the end of the twenty first century from regional climate model simulations

Communicating climate change: conduits, content, and consensus

Is supplementary feeding in gardens a driver of evolutionary change in a migratory bird species? (open access)

Agriculture and the threat to biodiversity in sub-saharan africa (open access)

The uncertainty of climate sensitivity and its implication for the Paris negotiation

Summertime atmosphere–ocean preconditionings for the Bering Sea ice retreat and the following severe winters in North America (open access)

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New research, September 22, 2015

Posted by Ari Jokimäki on September 22, 2015

Some new papers from last few days:

Modern glacier velocities across the Icefield Ranges, St Elias Mountains, and variability at selected glaciers from 1959 to 2012

Historically unprecedented global glacier decline in the early 21st century

Ice thickness measurements and volume estimates for glaciers in Norway

Direct measurements of World Ocean tidal currents with surface drifters

Observational evidence of strengthening of the Brewer-Dobson circulation since 1980

Abrupt shifts in phenology and vegetation productivity under climate extremes

The Influence of Sea Ice Dynamics on the Climate Sensitivity and Memory to Increased Antarctic Sea Ice

ENSO-like Variability: 1900-2013

Coordinated Global and Regional Climate Modelling

Coupled Northern Hemisphere permafrost–ice-sheet evolution over the last glacial cycle (open access)

Building a sustained climate assessment process

Relationships between maximum temperature and heat-related illness across North Carolina, USA

The effect of temperature on arson incidence in Toronto, Ontario, Canada

The influence of historical climate changes on Southern Ocean marine predator populations: a comparative analysis

Warmer, deeper and greener mixed layers in the north Atlantic subpolar gyre over the last 50 years

Ships’ logbooks from the Arctic in the pre-instrumental period (open access)

Summertime atmosphere–ocean preconditionings for the Bering Sea ice retreat and the following severe winters in North America (open access)

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New research, September 18, 2015

Posted by Ari Jokimäki on September 18, 2015

Some new papers from last few days:

Impact of aerosol emission controls on future Arctic sea ice cover

The “Pause” in Global Warming: Turning a Routine Fluctuation into a Problem for Science (open access)

Re-examining the relationship between climate sensitivity and the Southern Hemisphere radiation budget in CMIP models

Trends and Spatial Variability in Dry Spells Across the South-Central United States

A millennial summer temperature reconstruction for northeastern Canada using oxygen isotopes in subfossil trees (open access)

Changes in extreme temperature and precipitation events in the Loess Plateau (China) during 1960–2013 under global warming

Evidence of Atlantic Multidecadal Oscillation in the magnetic properties of Alpine lakes during the last 2500 years

Debunking the climate hiatus (open access)

Private diaries as information sources in climate research

Rapid warming and drought negatively impact population size and reproductive dynamics of an avian predator in the arid southwest

Response of the endangered tropical dry forests to climate change and the role of Mexican Protected Areas for their conservation

Limits to the quantification of local climate change (open access)

Environmental implications of perfluorotributylamine—a potent greenhouse gas

Disjunct populations of European vascular plant species keep the same climatic niches

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New research, September 14, 2015

Posted by Ari Jokimäki on September 14, 2015

Some new papers from last few days:

Eurasian winter cooling in the warming hiatus of 1998–2012

Noble gases trace Greenland’s surface and submarine melt in the ocean

Observations of the Summer Breakup of an Arctic Sea Ice Cover

Sea ice convergence along the Arctic coasts of Greenland and the Canadian Arctic Archipelago: Variability and extremes (1992–2014)

Climatic consequences of a Pine Island Glacier collapse

Fatalities in the United States Indirectly Associated with Atlantic Tropical Cyclones

Atmospheric impact of Arctic sea ice loss in a coupled ocean-atmosphere simulation

Drought Adaptation and Climate Change Beliefs Amongst Working Ranchers in Montana

Linear trends and closures of 10-year observations of AIRS stratospheric channels

Impact of Holocene climate variability on Arctic vegetation

Why does precipitation in northwest China show a significant increasing trend from 1960 to 2010?

Adapting to climate change in shifting landscapes of belief

Climatology and trend of wind power resources in China and its surrounding regions: a revisit using Climate Forecast System Reanalysis data

The timing of anthropogenic emergence in simulated climate extremes (open access)

The effectiveness of net negative carbon dioxide emissions in reversing anthropogenic climate change (open access)

How you talk about climate change matters: A communication network perspective on epistemic skepticism and belief strength

Biomass sustainability criteria: Greenhouse gas accounting issues for biogas and biomethane facilities

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New research, September 9, 2015

Posted by Ari Jokimäki on September 9, 2015

Some new papers from last few days:

Processes controlling surface, bottom and lateral melt of Arctic sea ice in a state of the art sea ice model

How well must climate models agree with observations? (open access)

Environment and Climate of Early Human Evolution

Global Monsoon Dynamics and Climate Change

Oceanic Forcing of Ice-Sheet Retreat: West Antarctica and More

Disentangling the contribution of multiple land covers to fires-mediated carbon emissions in Amazonia during the 2010 drought

Anomalous carbon uptake in Australia as seen by GOSAT

A Theory for Bjerknes Compensation: The Role of Climate Feedback

XBT Science: assessment of instrumental biases and errors

Black carbon concentrations and mixing state in the Finnish Arctic (open access)

Evolution of Ossoue Glacier (French Pyrenees) since the end of the Little Ice Age (open access)

Past changes in the vertical distribution of ozone – Part 3: Analysis and interpretation of trends (open access)

Controls on terrestrial carbon feedbacks by productivity versus turnover in the CMIP5 Earth System Models (open access)

Modeling climate change impact on potato crop phenology, and risk of frost damage and heat stress in northern Europe

How well do integrated assessment models represent non-CO2 radiative forcing? (open access)

Global and regional surface cooling in a warming climate: a multi-model analysis (open access)

A model based investigation of the relative importance of CO2-fertilization, climate warming, nitrogen deposition and land use change on the global terrestrial carbon uptake in the historical period

Causes of drying trends in northern hemispheric land areas in reconstructed soil moisture data (open access)

Sustainable domestic lighting options for poor people—an empirical study

Climate constraints on the carbon intensity of economic growth (open access)

Permafrost thaw and resulting soil moisture changes regulate projected high-latitude CO2 and CH4 emissions (open access)

Disentangling climatic and anthropogenic controls on global terrestrial evapotranspiration trends (open access)

Decelerating Atlantic meridional overturning circulation main cause of future west European summer atmospheric circulation changes (open access)

Diversity enhances carbon storage in tropical forests

Effects of ocean acidification on Posidonia oceanica epiphytic community and shoot productivity

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Papers on anthropogenic global warming and next glaciation

Posted by Ari Jokimäki on February 18, 2014

This is a list of papers on anthropogenic global warming and next glaciation. List also contains some papers that discuss next glaciation more generally. The list is not complete, and will most likely be updated in future in order to make it more thorough and more representative.

Impact of anthropogenic CO2 on the next glacial cycle – Herrero et al. (2013) “The model of Paillard and Parrenin (Earth Planet Sci Lett 227(3–4):263–271, 2004) has been recently optimized for the last eight glacial cycles, leading to two different relaxation models with model-data correlations between 0.8 and 0.9 (García-Olivares and Herrero (Clim Dyn 1–25, 2012b)). These two models are here used to predict the effect of an anthropogenic CO2 pulse on the evolution of atmospheric CO2, global ice volume and Antarctic ice cover during the next 300 kyr. The initial atmospheric CO2 condition is obtained after a critical data analysis that sets 1300 Gt as the most realistic carbon Ultimate Recoverable Resources (URR), with the help of a global compartmental model to determine the carbon transfer function to the atmosphere. The next 20 kyr will have an abnormally high greenhouse effect which, according to the CO2 values, will lengthen the present interglacial by some 25 to 33 kyr. This is because the perturbation of the current interglacial will lead to a delay in the future advance of the ice sheet on the Antarctic shelf, causing that the relative maximum of boreal insolation found 65 kyr after present (AP) will not affect the developing glaciation. Instead, it will be the following insolation peak, about 110 kyr AP, which will find an appropriate climatic state to trigger the next deglaciation.” Carmen Herrero, Antonio García-Olivares, Josep L. Pelegrí, Climatic Change, December 2013, DOI: 10.1007/s10584-013-1012-0.

Determining the natural length of the current interglacial – Tzedakis et al. (2012) “No glacial inception is projected to occur at the current atmospheric CO2 concentrations of 390 ppmv (ref. 1). Indeed, model experiments suggest that in the current orbital configuration—which is characterized by a weak minimum in summer insolation—glacial inception would require CO2 concentrations below preindustrial levels of 280 ppmv (refs 2, 3, 4). However, the precise CO2 threshold4, 5, 6 as well as the timing of the hypothetical next glaciation7 remain unclear. Past interglacials can be used to draw analogies with the present, provided their duration is known. Here we propose that the minimum age of a glacial inception is constrained by the onset of bipolar-seesaw climate variability, which requires ice-sheets large enough to produce iceberg discharges that disrupt the ocean circulation. We identify the bipolar seesaw in ice-core and North Atlantic marine records by the appearance of a distinct phasing of interhemispheric climate and hydrographic changes and ice-rafted debris. The glacial inception during Marine Isotope sub-Stage 19c, a close analogue for the present interglacial, occurred near the summer insolation minimum, suggesting that the interglacial was not prolonged by subdued radiative forcing7. Assuming that ice growth mainly responds to insolation and CO2 forcing, this analogy suggests that the end of the current interglacial would occur within the next 1500 years, if atmospheric CO2 concentrations did not exceed 240±5 ppmv.” P. C. Tzedakis, J. E. T. Channell, D. A. Hodell, H. F. Kleiven & L. C. Skinner, Nature Geoscience 5, 138–141(2012), doi:10.1038/ngeo1358. [Full text]

How can a glacial inception be predicted? – Crucifix (2011) “The Early Anthropogenic Hypothesis considers that greenhouse gas concentrations should have declined during the Holocene in absence of humankind activity, leading to glacial inception around the present. It partly relies on the fact that present levels of northern summer incoming solar radiation are close to those that, in the past, preceded a glacial inception phenomenon, associated with declines in greenhouse gas concentrations. However, experiments with various numerical models of glacial cycles show that next glacial inception may still be delayed by several tens of thousands of years, even with the assumption of a decline in greenhouse gas concentrations during the Holocene. Furthermore, as we show here, conceptual models designed to capture the gross dynamics of the climate system as a whole suggest also that small disturbances may sometimes cause substantial delays in glacial events, causing a fair level of unpredictability on ice age dynamics. This suggests the need for a validated mathematical description of climate system dynamics that allows us to quantify uncertainties on predictions. Here, it is proposed to organise our knowledge about the physics and dynamics of glacial cycles through a Bayesian inference network. Constraints on the physics and dynamics of climate can be encapsulated into a stochastic dynamical system. These constraints include, in particular, estimates of the sensitivity of the components of climate to external forcings, inferred from plans of experiments with large simulators of the atmosphere, oceans and ice sheets. On the other hand, palaeoclimate observations are accounted for through a process of parameter calibration. We discuss promises and challenges raised by this programme.” Michel Crucifix, The Holocene August 2011 vol. 21 no. 5 831-842, doi: 10.1177/0959683610394883. [Full text]

The impact of insolation, greenhouse gas forcing and ocean circulation changes on glacial inception – Vettoretti & Peltier (2011) “In this study we employ the NCAR CCSM3 coupled model to investigate the onset of high northern latitude perennial snow cover. Two periods of Earth’s insolation history, that of the pre-industrial period and that of 116 ka before present (BP), are used as benchmarks in an investigation of the influences of interglacial greenhouse gas (GHG) concentration and insolation upon the occurrence of permanent summer snow cover. An additional two experiments at 10 ka and 51 ka into the future (AP) using a typical interglacial GHG level are used to investigate the length of the current interglacial. Results from this set of multicentury sensitivity experiments demonstrate the relative importance of forcings due to insolation and atmospheric greenhouse gases at the millennial scale, and of Atlantic ocean overturning strength (AMOC) at the century scale. We find that while areas of perennial snow cover are sensitive to GHG concentrations, they are much more sensitive to the contemporaneous insolation regime. The goodness of fit of the climatology of the control model to the modern observed climatology is found to influence the modeling results. While there is a strong correlation between AMOC decadal variability and high latitude surface temperature in our control climates, we find little change in AMOC strength during our simulations of 116 ka BP climate nor do we find significant correlation between high latitude snow accumulation and the AMOC. Both the 10 ka AP and 51 ka AP future simulations produce inception events which are much stronger than that of the equivalent pre-industrial simulation. The simulation of inception at 10 ka into the future suggests a maximum duration of the current interglacial of approximately 20 ka in the absence of modern anthropogenic forcing.” G. Vettoretti, W.R. Peltier, The Holocene August 2011 vol. 21 no. 5 803-817, doi: 10.1177/0959683610394885.

A movable trigger: Fossil fuel CO2 and the onset of the next glaciation – Archer & Ganopolski (2005) “The initiation of northern hemisphere ice sheets in the last 800 kyr appears to be closely controlled by minima in summer insolation forcing at 65°N. Beginning from an initial typical interglacial pCO2 of 280 ppm, the CLIMBER-2 model initiates an ice sheet in the Northern Hemisphere when insolation drops 0.7 σ (standard deviation) or 15 W/m2 below the mean. This same value is required to explain the history of climate using an orbitally driven conceptual model based on insolation and ice volume thresholds (Paillard, 1998). When the initial baseline pCO2 is raised in CLIMBER-2, a deeper minimum in summertime insolation is required to nucleate an ice sheet. Carbon cycle models indicate that ∼25% of CO2 from fossil fuel combustion will remain in the atmosphere for thousands of years, and ∼7% will remain beyond one hundred thousand years (Archer, 2005). We predict that a carbon release from fossil fuels or methane hydrate deposits of 5000 Gton C could prevent glaciation for the next 500,000 years, until after not one but two 400 kyr cycle eccentricity minima. The duration and intensity of the projected interglacial period are longer than have been seen in the last 2.6 million years.” David Archer, Andrey Ganopolski, Geochemistry, Geophysics, Geosystems, Volume 6, Issue 5, May 2005, DOI: 10.1029/2004GC000891. [Full text]

The Earth’s Climate in the Next Hundred Thousand years (100 kyr) – Berger et al. (2003) “One of the most striking features of the Quaternary paleoclimate records remains the so-called 100-kyr cycle which is undoubtedly linked to the future of our climate. Such a 100-kyr cycle is indeed characterised by long glacial periods followed by a short-interglacial (∼10–15 kyr long). As we are now in an interglacial, the Holocene, the previous one (the Eemian, which corresponds quite well to Marine Isotope Stage 5e, peaking at ∼125 kyr before present, BP) was assumed to be a good analogue for our present-day climate. In addition, as the Holocene is 10 kyr long, paleoclimatologists were naturally inclined to predict that we are quite close to the next ice age. Simulations using the 2-D climate model of Louvain-la-Neuve show, however, that the current interglacial will most probably last much longer than any previous ones. It is suggested here that this is related to the shape of the Earth’s orbit around the Sun, which will be almost circular over the next tens of thousands of years. As this is primarily related to the 400-kyr cycle of eccentricity, the best and closest analogue for such a forcing is definitely Marine Isotopic Stage 11 (MIS-11), some 400 kyr ago, not MIS-5e. Because the CO2 concentration in the atmosphere also plays an important role in shaping long-term climatic variations – especially its phase with respect to insolation – a detailed reconstruction of this previous interglacial from deep sea and ice records is urgently needed. Such a study is particularly important in the context of the already exceptional present-day CO2 concentrations (unprecedented over the past million years) and, even more so, because of even larger values predicted to occur during the 21st century due to human activities.” A. Berger, M. F. Loutre, M. Crucifix, Surveys in Geophysics, March 2003, Volume 24, Issue 2, pp 117-138. [Full text]

An Exceptionally Long Interglacial Ahead? – Berger & Loutre (2002) “Today’s comparatively warm climate has been the exception more than the rule during the last 500,000 years or more. If recent warm periods (or interglacials) are a guide, then we may soon slip into another glacial period. But Berger and Loutre argue in their Perspective that with or without human perturbations, the current warm climate may last another 50,000 years. The reason is a minimum in the eccentricity of Earth’s orbit around the Sun.” A. Berger, M. F. Loutre, Science 23 August 2002: Vol. 297 no. 5585 pp. 1287-1288, DOI: 10.1126/science.1076120. [Full text]

Future Climatic Changes: Are We Entering an Exceptionally Long Interglacial? – Loutre & Berger (2000) “Various experiments have been conducted using the Louvain-la-Neuve two-dimensional Northern Hemisphere climate model (LLN 2-D NH) to simulate climate for the next 130 kyr into the future. Simulations start with values representing the present-day Northern Hemisphere ice sheet, using different scenarios for future CO2 concentrations. The sensitivity of the model to the initial size of the Greenland ice sheet, and to possible impacts of human activities, has also been tested. Most of the natural scenarios indicate that: (i) the climate is likely to experience a longlasting (∼50 kyr) interglacial; (ii) the next glacial maximum is expected to be most intense at around 100 kyr after present (AP), with a likely interstadial at ∼60 kyr AP; and (iii) after 100 kyr AP continental ice rapidly melts, leading to an ice volume minimum 20 kyr later. However, the amplitude and, to a lesser extent, the timing of future climatic changes depend on the CO2 scenario and on the initial conditions related to the assumed present-day ice volume. According to our modelling experiments, man’s activities over the next centuries may significantly affect the ice-sheet’s behaviour for approximately the next 50 kyr. Finally, the existence of thresholds in CO2 and insolation, earlier shown to be significant for the past, is confirmed to be also important for the future.” M. F. Loutre, A. Berger, Climatic Change, July 2000, Volume 46, Issue 1-2, pp 61-90, DOI 10.1023/A:1005559827189. [Full text]

The end of the present interglacial: how and when? – Broecker (1998) “Despite the large decline in Northern Hemisphere summer insolation during the last 8000 years, neither sea level nor polar temperatures have as yet undergone any significant downturn. This behavior is consistent with the prediction by Kukla and Matthews (1972) that the Holocene interglacial will terminate suddenly with a jump to another of the climate system’s modes of operation. This is what happened at the end of the last period of peak interglaciation. However, complicating the situation is evidence that ice sheet growth during the transition from marine stage 5e to 5d preceded the shut down of the Atlantic’s conveyor circulation which is thought to have brought Europe’s Eemian to a close. If so, then in the natural course of events, the end of the present interglaciation awaits the onset of icecap growth. However, it must be kept in mind that the ongoing buildup of greenhouse gases may alter the natural course of events. In particular, the warming and wetting of the planet will gradually reduce the density of surface waters in the regions where deep waters form. As this reduction is not likely to be symmetrical between the northern Atlantic and the margin of the Antarctic continent, the current near balance between deep water production in the north and south may be disrupted causing an abrupt reorganization of the ocean’s thermohaline circulation. Based on the paleoclimatic record, such a reorganization would have had a profound impact on the planet’s climate.” Broecker, W.S., Quaternary Science Reviews, Volume 17, Number 8, 1 August 1998 , pp. 689-694(6), DOI: [Full text]

Summer solstice solar radiation, the 100 kyr Ice Age cycle, and the next Ice Age – Ledley (1995) “Modeling studies suggest that the summer solstice solar radiation is more important than the caloric half-year solar radiation in producing glacial/interglacial cycles because it is more representative of the energy available to melt ice during the short melt season. Here it is shown that the correlation between the summer solstice solar radiation and the rate of change of the oxygen isotope record is generally greater than that between the caloric half-year radiation and the rate of change of the oxygen isotope record. These results also suggest that the sawtoothed nature of the 100 kyr cycle may be produced by periods of relatively slow changes in ice volume, punctuated by periods of rapid growth that are initiated at times of extremely low summer solstice radiation; and that it is unlikely that an ice age will begin in the next 70 kyr.” Tamara Shapiro Ledley, Geophysical Research Letters, Volume 22, Issue 20, pages 2745–2748, 15 October 1995, DOI: 10.1029/95GL03027.

Possible effects of anthropogenically-increased CO2 on the dynamics of climate: Implications for ice age cycles – Saltzman et al. (1993) “A dynamical model, developed to account for the observed major variations of global ice mass and atmospheric CO2 during the late Cenozoic, is used to provide a quantitative demonstration of the possibility that the anthropogenically-forced increase of atmospheric CO2, if maintained over a long period of time (perhaps by tectonic forcing), could displace the climatic system from an unstable regime of oscillating ice ages into a more stable regime representative of the pre-Pleistocene. This stable regime is characterized by orbitally-forced oscillations that are of much weaker amplitude than prevailed during the Pleistocene.” Barry Saltzman, Kirk A. Maasch, Mikhail Ya. Verbitsky, Geophysical Research Letters, Volume 20, Issue 11, pages 1051–1054, 7 June 1993, DOI: 10.1029/93GL01015.

Quaternary Research special issue: The end of the present interglacial – several authors, 24 papers (1972) Only abstracts are available for individual papers. Quaternary Research, Volume 2, Issue 3, Pages 261-445 (November 1972).

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Papers on health effects of increased CO2

Posted by Ari Jokimäki on November 4, 2011

This is a list of papers dealing with different aspects of the health effects of increased carbon dioxide. The list contains subsections for general studies, increasing atmospheric CO2 and allergies, and extreme carbon dioxide events. The list is not complete, and will most likely be updated in the future in order to make it more thorough and more representative.

UPDATE (April 11, 2013): New section for atmospheric carbon dioxide and allergies added including 10 papers.
UPDATE (November 9, 2011): Robertson (2006) added.

General studies

High carbon dioxide concentrations in the classroom: the need for research on the effects of children’s exposure to poor indoor air quality at school – Miller et al. (2010) “Air quality and its effect on health have received recent attention from the House of Commons Environmental Audit Committee. 1 While outdoor air pollution is clearly important and contributes to indoor air quality, indoor air pollution sources and the time spent in indoor environments are key to understanding exposure.” Janice Miller, Sean Semple, Stephen Turner, Occup Environ Med 2010;67:799 doi:10.1136/oem.2010.057471.

Occupational hazards of carbon dioxide exposure – Scott et al. (2009) “This paper is an overview of the occupational hazards that result from exposure to carbon dioxide. It details the main uses, characteristics, and problems that have been identified when carbon dioxide is utilized in various working environments. Carbon dioxide is always a danger when present in enclosed spaces at elevated concentrations. Situations resulting from acute and chronic exposures involving the gaseous and dry ice forms of carbon dioxide are discussed in detail. Current rationale concerning exposure limits and monitoring recommendations are highlighted.” Jonathan L. Scott, David G. Kraemer, Randal J. Keller, Journal of Chemical Health and Safety, Volume 16, Issue 2, March-April 2009, Pages 18-22, doi:10.1016/j.jchas.2008.06.003.

Effects of carbon dioxide inhalation on psychomotor and mental performance during exercise and recovery – Vercruyssen et al. (2007) “On separate days, 6 highly trained participants performed psychomotor tests while breathing for 60 min 3 carbon dioxide (CO(2)) mixtures (room air, 3% CO(2), or 4% CO(2)) prior to, between, and following two 15-min treadmill exercise bouts (70% VO(2)(max)). Each individual was extensively practiced (at least 4 days) before testing began, and both gas conditions and order of tasks were counterbalanced. Results showed physiological reactions and work-related psychomotor effects, but no effects of gas concentration on addition, multiplication, grammatical reasoning, or dynamic postural balance. These findings help define behavioral toxicity levels and support a re-evaluation of existing standards for the maximum allowable concentrations (also emergency and continuous exposure guidance levels) of CO(2). This research explored the selection of psychometric instruments of sufficient sensitivity and reliability to detect subtle changes in performance caused by exposure to low levels of environmental stress, in this case differential levels of CO(2) in the inspired air.” Vercruyssen M, Kamon E, Hancock PA., Int J Occup Saf Ergon. 2007;13(1):15-27. [Full text]

Health effects of increase in concentration of carbon dioxide in the atmosphere – Robertson (2006) “The toxic effects, to humans and other mammals, of concentrations of carbon dioxide in the atmosphere which are below the safe working level but above the present level are described. The likely physiological effects of the predicted increase in concentration of carbon dioxide in the atmosphere over the next 50 years are detailed.” A quote from the article: “At a carbon dioxide concentration of 600 ppm in an indoor atmosphere, the occupants become aware of deterioration in the atmosphere. At and above this level, some occupants began to display one or more of the classic symptoms of carbon dioxide poisoning, e.g. difficulty in breathing, rapid pulse rate, headache, hearing loss, hyperventilation, sweating and fatigue. At 1000 ppm, nearly all the occupants were affected. […] In the event that the atmospheric concentration of carbon dioxide reaches 600 ppm, the planet will have a permanent outdoor atmosphere exactly like that of a stuffy room. The conditions indoors in buildings of the type now available will become even more unpleasant and could easily reach 1000 ppm permanently with the results outlined above.” D. S. Robertson, Current science, 2006, vol. 90, no12, pp. 1607-1609. [Full text]

Carbon Dioxide Poisoning – Langford (2005) “Carbon dioxide is a physiologically important gas, produced by the body as a result of cellular metabolism. It is widely used in the food industry in the carbonation of beverages, in fire extinguishers as an `inerting’ agent and in the chemical industry. Its main mode of action is as an asphyxiant, although it also exerts toxic effects at cellular level. At low concentrations, gaseous carbon dioxide appears to have little toxicological effect. At higher concentrations it leads to an increased respiratory rate, tachycardia, cardiac arrhythmias and impaired consciousness. Concentrations >10% may cause convulsions, coma and death. Solid carbon dioxide may cause burns following direct contact. If it is warmed rapidly, large amounts of carbon dioxide are generated, which can be dangerous, particularly within confined areas. The management of carbon dioxide poisoning requires the immediate removal of the casualty from the toxic environment, the administration of oxygen and appropriate supportive care. In severe cases, assisted ventilation may be required. Dry ice burns are treated similarly to other cryogenic burns, requiring thawing of the tissue and suitable analgesia. Healing may be delayed and surgical intervention may be required in severe cases.” Langford, Nigel J., Toxicological Reviews, Volume 24, Number 4, 2005 , pp. 229-235(7).

Association of Ventilation Rates and CO2 Concentrations with Health andOther Responses in Commercial and Institutional Buildings – Seppänen et al. (1999) “This paper reviews current literature on the associations of ventilation rates and carbon dioxide concentrations in non-residential and non-industrial buildings (primarily offices) with health and other human outcomes. Twenty studies, with close to 30,000 subjects, investigated the association of ventilation rates with human responses, and 21 studies, with over 30,000 subjects, investigated the association of carbon dioxide concentration with these responses. Almost all studies found that ventilation rates below 10 Ls-1 per person in all building types were associated with statistically significant worsening in one or more health or perceived air quality outcomes. Some studies determined that increases in ventilation rates above 10 Ls-1 per person, up to approximately 20 Ls-1 per person, were associated with further significant decreases in the prevalence of sick building syndrome (SBS) symptoms or with further significant improvements in perceived air quality. The carbon dioxide studies support these findings. About half of the carbon dioxide studies suggest that the risk of sick building syndrome symptoms continued to decrease significantly with decreasing carbon dioxide concentrations below 800 ppm. The ventilation studies reported relative risks of 1.5–2 for respiratory illnesses and 1.1–6 for sick building syndrome symptoms for low compared to high low ventilation rates.” O. A. Seppänen, W. J. Fisk, M. J. Mendell, Indoor Air, Volume 9, Issue 4, pages 226–252, December 1999, DOI: 10.1111/j.1600-0668.1999.00003.x. [Full text]

Indoor Air Quality Investigations at Five Classrooms – Lee & Chang (1999) “Five classrooms, air-conditioned or naturally ventilated, at five different schools were chosen for comparison of indoor and outdoor air quality. Temperature, relative humidity (RH), carbon dioxide (CO2), sulphur dioxide (SO2), nitric oxide (NO), nitrogen dioxide (NO2), particulate matter with diameter less than 10 mm (PM10), formaldehyde (HCHO), and total bacteria counts were monitored at indoor and outdoor locations simultaneously. Respirable particulate matter was found to be the worst among parameters measured in this study. The indoor and outdoor average PM10 concentrations exceeded the Hong Kong standards, and the maximum indoor PM10 level was even at 472 μ;g/m3. Air cleaners could be used in classrooms to reduce the high PM10 concentration. Indoor CO2 concentrations often exceeded 1,000 μl/l indicating inadequate ventilation. Lowering the occupancy and increasing breaks between classes could alleviate the high CO2 concentrations. Though the maximum indoor CO2 level reached 5,900 μl/l during class at one of the sites, CO2 concentrations were still at levels that pose no health threats.” S. C. Lee, Maureen Chang, Indoor Air, Volume 9, Issue 2, pages 134–138, June 1999, DOI: 10.1111/j.1600-0668.1999.t01-2-00008.x.

Effects of sustained low-level elevations of carbon dioxide on cerebral blood flow and autoregulation of the intracerebral arteries in humans – Sliwka et al. (1998) “Cerebral blood flow velocity (CBFv) was measured by insonating the middle cerebral arteries of four subjects using a 2 Mhz transcranial Doppler. Ambient CO2 was elevated to 0.7% for 23 d in the first study and to 1.2% for 23 d in the same subjects in the second study. By non-parametric testing CBFv was elevated significantly by +35% above pre-exposure levels during the first 1-3 d at both exposure levels, after which CBFv progressively readjusted to pre-exposure levels. Despite similar CBFv responses, headache was only reported during the initial phase of exposure to 1.2% CO2. Vascular reactivity to CO2 assessed by rebreathing showed a similar pattern with the CBFv increases early in the exposures being greater than those elicited later. An increase in metabolic rate of the visual cortex was evoked by having the subjects open and close their eyes during a visual stimulus. Evoked CBFv responses measured in the posterior cerebral artery were also elevated in the first 1-3 d of both studies returning to pre-exposure levels as hypercapnia continued. Cerebral vascular autoregulation assessed by raising head pressure during 10 degrees head-down tilt both during the low-level exposures and during rebreathing was unaltered. There were no changes in the retinal microcirculation during serial fundoscopy studies. The time-dependent changes in CO2 vascular reactivity might be due either to retention of bicarbonate in brain extracellular fluid or to progressive increases in ventilation, or both. Cerebral vascular autoregulation appears preserved during chronic exposure to these low levels of ambient CO2.” Sliwka U, Krasney JA, Simon SG, Schmidt P, Noth J., Aviat Space Environ Med. 1998 Mar;69(3):299-306.

Sick Building Syndrome Symptoms among the Staff in Schools and Kindergartens: are the Levels of Volatile Organic Compounds and Carbon Dioxide Responsible? – Willers et al. (1996) “From a large questionnaire-based survey investigating the indoor air quality (IAQ) in 48 schools and 74 kindergartens, 21 schools were selected for mea surements of volatile organic compounds (VOC) and carbon dioxide (CO2) based on the prevalence of sick building syndrome (SBS) symptoms reported by the staff. The 10 schools with the lowest prevalence of SBS symptoms ‘healthy’) were compared to 11 schools with the highest prevalence (‘sick’; median value showing twice as many SBS symptoms reported). The concen trations of total VOCs (TVOC) in schools and kindergartens were low and within suggested guidelines. The levels of CO2 were higher than suggested guidelines in several cases. However, neither TVOC nor CO2 concentrations were associated with SBS symptoms. Thus, TVOC and CO2 concentrations do not seem to be useful as SBS risk indicators.” Stefan Willers, Sven Andersson, Rolf Andersson, Jörgen Grantén, Christina Sverdrup, Lars Rosell, Indoor and Built Environment July 1996 vol. 5 no. 4 232-235, doi: 10.1177/1420326X9600500406.

Effects of carbon dioxide inhalation on psychomotor and mental performance during exercise and recovery – Sheehy et al. (1982) “Psychomotor and mental tests involving reaction time, rotor pursuit, short-term memory for digits and letters, and reasoning ability were administered to subjects inhaling up to 5% CO2 in air and in gas mixtures containing 50% O2. The psychomotor and mental tests were given during the 6 min of recovery following 10 min of treadmill running at 80% of aerobic capacity. Although the subjects inhaled the CO2 during the entire exercise and recovery period there was no difference in performance between the CO2 inhalation condition and the control condition for any of the performance measures.” Sheehy, J B; Kamon, E; Kiser, D., Human Factors. Vol. 24, pp. 581-588. Oct. 1982.

Effects on man of high concentrations of carbon dioxide in relation to various oxygen pressures during exposures as long as 72 hours – Consolazio et al. (1947) No abstract. W. V. Consolazio, M. B. Fisher, N. Pace, I. J. Pecora, G. C. Pitts, A. R. Behnke, American Journal of Physiology, November 1947 vol. 151 no. 2 479-503.

Increasing atmospheric CO2 and allergies

Changes in Atmospheric CO2 Influence the Allergenicity of Aspergillus fumigatus – Lang-Yona et al. (2013) “Increased susceptibility to allergies has been documented in the Western world in recent decades. However, a comprehensive understanding of its causes is not yet available. It is therefore essential to understand trends and mechanisms of allergy-inducing agents, such as fungal conidia. In this study we investigated the hypothesis that environmental conditions linked to global atmospheric changes can affect the allergenicity of Aspergillus fumigatus, a common allergenic fungal species in indoor and outdoor environments and in airborne particulate matter. We show that fungi grown under present day CO2 levels (392 ppm) exhibit 8.5 and 3.5 fold higher allergenicity compared to fungi grown at preindustrial (280 ppm) and double (560 ppm) CO2 levels, respectively. A corresponding trend is observed in the expression of genes encoding for known allergenic proteins and in the major allergen Asp f1 concentrations, possibly due to physiological changes such as respiration rates and the nitrogen content of the fungus, influenced by the CO2 concentrations. Increased carbon and nitrogen levels in the growth medium also lead to a significant increase in the allergenicity. We propose that climatic changes such as increasing atmospheric CO2 levels and changes in the fungal growth medium may impact the ability of allergenic fungi such as Aspergillus fumigatus to induce allergies.” Naama Lang-Yona, Yishai Levin, Karen C. Dannemiller, Oded Yarden, Jordan Peccia, Yinon Rudich, Global Change Biology, DOI: 10.1111/gcb.12219.

Anthropogenic climate change and allergen exposure: The role of plant biology – Ziska & Beggs (2012) “Accumulation of anthropogenic gases, particularly CO2, is likely to have 2 fundamental effects on plant biology. The first is an indirect effect through Earth’s increasing average surface temperatures, with subsequent effects on other aspects of climate, such as rainfall and extreme weather events. The second is a direct effect caused by CO2-induced stimulation of photosynthesis and plant growth. Both effects are likely to alter a number of fundamental aspects of plant biology and human health, including aerobiology and allergic diseases, respectively. This review highlights the current and projected effect of increasing CO2 and climate change in the context of plants and allergen exposure, emphasizing direct effects on plant physiologic parameters (eg, pollen production) and indirect effects (eg, fungal sporulation) related to diverse biotic and abiotic interactions. Overall, the review assumes that future global mitigation efforts will be limited and suggests a number of key research areas that will assist in adapting to the ongoing challenges to public health associated with increased allergen exposure.” Lewis H. Ziska, Paul J. Beggs, Journal of Allergy and Clinical Immunology, Volume 129, Issue 1, January 2012, Pages 27–32,

Elevated atmospheric carbon dioxide concentrations amplify Alternaria alternata sporulation and total antigen production – Wolf et al. (2010) “BACKGROUND: Although the effect of elevated carbon dioxide (CO2) concentration on pollen production has been established in some plant species, impacts on fungal sporulation and antigen production have not been elucidated. OBJECTIVE: Our purpose was to examine the effects of rising atmospheric CO2 concentrations on the quantity and quality of fungal spores produced on timothy (Phleum pratense) leaves. METHODS: Timothy plants were grown at four CO2 concentrations (300, 400, 500, and 600 micromol/mol). Leaves were used as growth substrate for Alternaria alternata and Cladosporium phlei. The spore abundance produced by both fungi, as well as the size (microscopy) and antigenic protein content (ELISA) of A. alternata, were quantified. RESULTS: Leaf carbon-to-nitrogen ratio was greater at 500 and 600 micromol/mol, and leaf biomass was greater at 600 micromol/mol than at the lower CO2 concentrations. Leaf carbon-to-nitrogen ratio was positively correlated with A. alternata spore production per gram of leaf but negatively correlated with antigenic protein content per spore. At 500 and 600 micromol/mol CO2 concentrations, A. alternata produced nearly three times the number of spores and more than twice the total antigenic protein per plant than at lower concentrations. C. phlei spore production was positively correlated with leaf carbon-to-nitrogen ratio, but overall spore production was much lower than in A. alternata, and total per-plant production did not vary among CO2 concentrations. CONCLUSIONS: Elevated CO2 concentrations often increase plant leaf biomass and carbon-to-nitrogen ratio. Here we demonstrate for the first time that these leaf changes are associated with increased spore production by A. alternata, a ubiquitous allergenic fungus. This response may contribute to the increasing prevalence of allergies and asthma.” Wolf J, O’Neill NR, Rogers CA, Muilenberg ML, Ziska LH., Environ Health Perspect. 2010 Sep;118(9):1223-8. doi: 10.1289/ehp.0901867. [Full text]

Impacts of climate change on plant food allergens: a previously unrecognized threat to human health – Beggs & Walczyk (2008) “Global climate change has had, and will continue to have, many significant impacts on biological and human systems. There are now many studies of climate change impacts on aeroallergens, particularly pollen, including a study demonstrating significant increases in the major allergen content of ragweed pollen as a function of rising atmospheric carbon dioxide concentration ([CO2]). Recent research has also demonstrated more allergenic poison ivy in response to elevated [CO2]. Here, we suggest, for the first time, the potential for global climate change, and, in particular, increased [CO2] and temperature, to have an impact on the allergenicity of plant food allergens such as peanut. Such impacts could have significant impacts on associated allergic diseases, and pose a previously unrecognized threat to human health. There is an urgent need for research on the impacts of climate change on plant food allergens.” Paul John Beggs, Nicole Ewa Walczyk, Air Quality, Atmosphere & Health, October 2008, Volume 1, Issue 2, pp 119-123, DOI: 10.1007/s11869-008-0013-z. [Full text]

Pollen production by Pinus taeda growing in elevated atmospheric CO2 – Ladeau & Clark (2006) “Rising concentrations of atmospheric CO2 may have important consequences for reproductive allocation in forest trees. Changes in pollen production could influence population dynamics and is likely to have important consequences for human health. This is the first study to evaluate pollen production by forest trees in response to rising atmospheric CO2. Our research objective was to quantify pollen production by Loblolly Pine (Pinus taeda L.) trees growing in elevated CO2 (ambient + 200 µl l−1) since 1996. Trees grown in high-CO2 plots first began producing pollen while younger and at smaller sizes relative to ambient-grown trees. Pollen cone and airborne pollen grain abundances were significantly greater in the fumigated stands. We conclude that the greater number of mature trees in high-CO2 plots resulted in greater pollen production at the stand level. Precocious pollen production has important implications for fertilization and pollen dispersal from young, dense stands. Increasing levels of airborne pollen raise concerns for escalating rates of human respiratory disease.” S. L. Ladeau, J. S. Clark, Functional Ecology, Volume 20, Issue 3, pages 541–547, June 2006, DOI: 10.1111/j.1365-2435.2006.01133.x. [Full text]

Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 – Mohan et al. (2006) “Contact with poison ivy (Toxicodendron radicans) is one of the most widely reported ailments at poison centers in the United States, and this plant has been introduced throughout the world, where it occurs with other allergenic members of the cashew family (Anacardiaceae). Approximately 80% of humans develop dermatitis upon exposure to the carbon-based active compound, urushiol. It is not known how poison ivy might respond to increasing concentrations of atmospheric carbon dioxide (CO2), but previous work done in controlled growth chambers shows that other vines exhibit large growth enhancement from elevated CO2. Rising CO2 is potentially responsible for the increased vine abundance that is inhibiting forest regeneration and increasing tree mortality around the world. In this 6-year study at the Duke University Free-Air CO2 Enrichment experiment, we show that elevated atmospheric CO2 in an intact forest ecosystem increases photosynthesis, water use efficiency, growth, and population biomass of poison ivy. The CO2 growth stimulation exceeds that of most other woody species. Furthermore, high-CO2 plants produce a more allergenic form of urushiol. Our results indicate that Toxicodendron taxa will become more abundant and more “toxic” in the future, potentially affecting global forest dynamics and human health.” Jacqueline E. Mohan, Lewis H. Ziska, William H. Schlesinger, Richard B. Thomas, Richard C. Sicher, Kate George, and James S. Clark, PNAS June 13, 2006 vol. 103 no. 24 9086-9089, doi: 10.1073/pnas.0602392103. [Full text]

Increasing Amb a 1 content in common ragweed (Ambrosia artemisiifolia) pollen as a function of rising atmospheric CO2 concentration – Singer et al. (2005) “Although the impact of increasing atmospheric carbon dioxide concentration ([CO2]) on production of common ragweed (Ambrosia artemisiifolia L.) pollen has been examined in both indoor and outdoor experiments, the relationship between allergen expression and [CO2] is not known. An enzyme-linked immunosorbent assay (ELISA) was used to quantify Amb a 1, ragweed’s major allergen, in protein extracted from pollen of A. artemisiifolia grown at different [CO2] values in a previous experiment. The concentrations used approximated atmospheric pre-industrial conditions (i.e. at the end of the 19th century), current conditions, and the CO2 concentration projected for the middle of the 21st century (280, 370 and 600 μmol mol–1 CO2, respectively). Although total pollen protein remained unchanged, significant increases in Amb a 1 allergen were observed between pre-industrial and projected future [CO2] and between current and projected future [CO2] (1.8 and 1.6 times, respectively). These data suggest that recent and projected increases in [CO2] could directly increase the allergenicity of ragweed pollen and consequently the prevalence and / or severity of seasonal allergic disease. However, genetic and abiotic factors governing allergen expression will need to be better established to fully understand these data and their implications for public health.” Ben D. Singer A C, Lewis H. Ziska B D, David A. Frenz C, Dennis E. Gebhard C, James G. Straka, Functional Plant Biology 32(7) 667–670, [Full text]

Production of allergenic pollen by ragweed (Ambrosia artemisiifolia L.) is increased in CO2-enriched atmospheres – Wayne et al. (2002) “Background: The potential effects of global climate change on allergenic pollen production are still poorly understood. Objective: To study the direct impact of rising atmospheric CO2 concentrations on ragweed (Ambrosia artemisiifolia L.) pollen production and growth. Methods: In environmentally controlled greenhouses, stands of ragweed plants were grown from seed through flowering stages at both ambient and twice-ambient CO2 levels (350 vs 700 μL L−1). Outcome measures included stand-level total pollen production and end-of-season measures of plant mass, height, and seed production. Results: A doubling of the atmospheric CO2 concentration stimulated ragweed-pollen production by 61% (P = 0.005). Conclusions: These results suggest that there may be significant increases in exposure to allergenic pollen under the present scenarios of global warming. Further studies may enable public health groups to more accurately evaluate the future risks of hay fever and respiratory diseases (eg, asthma) exacerbated by allergenic pollen, and to develop strategies to mitigate them.” Peter Wayne, Susannah Foster, John Connolly, Fakhri Bazzaz, Paul Epstein, Annals of Allergy, Asthma & Immunology, Volume 88, Issue 3, March 2002, Pages 279–282, [Full text]

Rising CO2 and pollen production of common ragweed (Ambrosia artemisiifolia L.), a known allergy-inducing species: implications for public health – Ziska & Caulfield (2000) “Although environmental factors such as precipitation and temperature are recognized as influencing pollen production, the impact of rising atmospheric carbon dioxide concentration ([CO2]) on the potential growth and pollen production of hay-fever-inducing plants is unknown. Here we present measurements of growth and pollen production of common ragweed (Ambrosia artemisiifolia L.) from pre-industrial [CO2] (280 mol mol–1) to current concentrations (370 mol mol–1) to a projected 21st century concentration (600 mol mol–1). We found that exposure to current and elevated [CO2] increased ragweed pollen production by 131 and 320%, respectively, compared to plants grown at pre-industrial [CO2]. The observed stimulations of pollen production from the pre-industrial [CO2] were due to an increase in the number (at 370 mol mol–1) and number and size (at 600 mol mol–1) of floral spikes. Overall, floral weight as a percentage of total plant weight decreased (from 21% to 13%), while investment in pollen increased (from 3.6 to 6%) between 280 and 600 mol mol–1 CO2. Our results suggest that the continuing increase in atmospheric [CO2] could directly influence public health by stimulating the growth and pollen production of allergy-inducing species such as ragweed.” Lewis H. Ziska and Frances A. Caulfield, Australian Journal of Plant Physiology 27(10) 893 – 898, doi:10.1071/PP00032. [Full text]

Increased levels of airborne fungal spores in response to Populus tremuloides grown under elevated atmospheric CO2 – Klironomos et al. (1997) “Soil fungi are important components of terrestrial ecosystems. They function as decomposers, pathogens, parasites, and mutualistic symbionts. Their main mode of dispersal is to liberate spores into the atmosphere. In this study we tested the hypothesis that a higher atmospheric CO2 concentration will induce greater sporulation in common soil fungi, leading to higher concentrations of fungal propagules in the atmosphere. In our field experiment, the concentration of airborne fungal propagules, mostly spores, increased fourfold under twice-ambient CO2 concentrations. Analysis of decomposing leaf litter (likely the main source of airborne fungal propagules) indicated that the fungi produced fivefold more spores under elevated CO2. Our results provide evidence that elevations in atmospheric CO2 concentration can directly affect microbial function, which may have important implications for litter decay, fungal dispersal, and human respiratory health. Key words: atmospheric CO2, fungal spores, global change, Populus tremuloides.” John N. Klironomos, Matthias C. Rillig, Michael F. Allen, Donald R. Zak, Kurt S. Pregitzer, Mark E. Kubiske, Canadian Journal of Botany, 1997, 75(10): 1670-1673, 10.1139/b97-880.

Extreme carbon dioxide events

This section lists papers on some extreme events where carbon dioxide has caused deaths or serious harm. It should be noted that this is not very relevant to the carbon dioxide levels associated with current global warming. However, for some carbon capture and storage scenarios these events serve as practical examples to what happens during high local carbon dioxide levels.

Non-volcanic CO2 Earth degassing: Case of Mefite d’Ansanto (southern Apennines), Italy – Chiodini et al. (2010) “Mefite d’Ansanto, southern Apennines, Italy is the largest natural emission of low temperature CO2 rich gases, from non-volcanic environment, ever measured in the Earth. The emission is fed by a buried reservoir, made up of permeable limestones and covered by clayey sediments. We estimated a total gas flux of ~2000 tons per day. Under low wind conditions, the gas flows along a narrow natural channel producing a persistent gas river which has killed over a period of time people and animals. The application of a physical numerical model allowed us to define the zones which potentially can be affected by dangerous CO2 concentration at breathing height for humans.” Chiodini, G., D. Granieri, R. Avino, S. Caliro, A. Costa, C. Minopoli, and G. Vilardo (2010), Geophys. Res. Lett., 37, L11303, doi:10.1029/2010GL042858.

Asphyxiation Due to Dry Ice in a Walk-in Freezer – Dunford et al. (2009) “Background: Exposure to a high concentration of environmental carbon dioxide (CO2) can result in poisoning through direct toxicity and by displacing atmospheric oxygen (O2). Dry ice undergoes sublimation to a gaseous state at −78.5°C (−109.3°F), which is heavier than air and can accumulate in dependent areas. Case Report: We report the case of a 59-year-old man found in cardiac arrest shortly after entering a recently repaired walk-in freezer that contained dry ice. First responders and bystanders did not recognize the proximate hazardous environment but were fortunately uninjured. A careful Emergency Department history coupled with rapid case investigation by the Medical Examiner’s Office led to the determination of the cause of death and the elimination of the ongoing hazard. Conclusion: This case illustrates the lethal consequences of improper storage of dry ice and the need to consider toxic environmental exposure as a cause of sudden cardiac arrest.” James V. Dunford, Jon Lucas, Nick Vent, Richard F. Clark, F. Lee Cantrell, The Journal of Emergency Medicine, Volume 36, Issue 4, May 2009, Pages 353-356, doi:10.1016/j.jemermed.2008.02.051.

A Carbon Dioxide Fatality from Dry Ice – Srisont et al. (2009) “This report documents a rare case of carbon dioxide intoxication in a young healthy male. The deceased hid in a small plastic container, size 1.5 × 1 × 1 m, and within 5 min he was located suffering convulsions and was reported as dead within minutes. Scene investigation revealed dry ice in the container. Autopsy findings were unremarkable. The probable cause of the convulsions was carbon dioxide intoxication due to both the dry ice sublimation and the small confined space in which he was hiding. This report emphasizes the significance of scene investigation in establishing the cause of the death.” Smith Srisont, Thamrong Chirachariyavej, A. V. M. Vichan Peonim, Journal of Forensic Sciences, Volume 54, Issue 4, pages 961–962, July 2009, DOI: 10.1111/j.1556-4029.2009.01057.x. [Full text]

A shallow-layer model for heavy gas dispersion from natural sources: Application and hazard assessment at Caldara di Manziana, Italy – Costa et al. (2008) “Several nonvolcanic sources in central Italy emit a large amount of carbon dioxide (CO2). Under stable atmospheric conditions and/or in the presence of topographic depressions, the concentration of CO2, which has a molecular mass greater than that of air, can reach high values that are lethal to humans or animals. Several episodes of this phenomenon were recorded in central Italy and elsewhere. In order to validate a model for the dispersion of a heavy gas and to assess the consequent hazard, we applied and tested the code TWODEE-2, an improved version of the established TWODEE model, which is based on a shallow-layer approach that uses depth-averaged variables to describe the flow behavior of dense gas over complex topography. We present results for a vented CO2 release at Caldara di Manziana in central Italy. We find that the model gives reliable results when the input quantity can be properly defined. Moreover, we show that the model can be a useful tool for gas hazard assessment by evaluating where and when lethal concentrations for humans and animals are reached.” Costa, A., G. Chiodini, D. Granieri, A. Folch, R. K. S. Hankin, S. Caliro, R. Avino, and C. Cardellini (2008), Geochem. Geophys. Geosyst., 9, Q03002, doi:10.1029/2007GC001762. [Full text]

Degassing Lakes Nyos and Monoun: Defusing certain disaster – Kling et al. (2005) “Since the catastrophic releases of CO2 in the 1980s, Lakes Nyos and Monoun in Cameroon experienced CO2 recharge at alarming rates of up to 80 mol/m2 per yr. Total gas pressures reached 8.3 and 15.6 bar in Monoun (2003) and Nyos (2001), respectively, resulting in gas saturation levels up to 97%. These natural hazards are distinguished by the potential for mitigation to prevent future disasters. Controlled degassing was initiated at Nyos (2001) and Monoun (2003) amid speculation it could inadvertently destabilize the lakes and trigger another gas burst. Our measurements indicate that water column structure has not been compromised by the degassing and local stability is increasing in the zones of degassing. Furthermore, gas content has been reduced in the lakes ≈12-14%. However, as gas is removed, the pressure at pipe inlets is reduced, and the removal rate will decrease over time. Based on 12 years of limnological measurements we developed a model of future removal rates and gas inventory, which predicts that in Monoun the current pipe will remove ≈30% of the gas remaining before the natural gas recharge balances the removal rate. In Nyos the single pipe will remove ≈25% of the gas remaining by 2015; this slow removal extends the present risk to local populations. More pipes and continued vigilance are required to reduce the risk of repeat disasters. Our model indicates that 75-99% of the gas remaining would be removed by 2010 with two pipes in Monoun and five pipes in Nyos, substantially reducing the risks.” George W. Kling, William C. Evans, Greg Tanyileke, Minoru Kusakabe, Takeshi Ohba, Yutaka Yoshida, and Joseph V. Hell, PNAS October 4, 2005 vol. 102 no. 40 14185-14190, doi: 10.1073/pnas.0502274102. [Full text]

Recent pH and CO2 profiles at Lakes Nyos and Monoun, Cameroon: implications for the degassing strategy and its numerical simulation – Kusakabe et al. (2000) “In situ pH profiles are reported for the first time for Lakes Nyos and Monoun. The pH profiles were converted to CO2 profiles using HCO3− profiles calculated from conductivity data. Recent observations (1993–1996) at Lake Nyos indicates that CO2 still accumulates below 180 m depth at a rate of 125 Mmol year−1. At Lake Monoun, the majority of CO2 is present below a depth of 60 m, only 25 m below the saturation depth. Consequently, a potential danger of gas explosion is high at both lakes, and artificial degassing of the lakes should be performed as soon as possible. A system for industrial degassing of the lakes is proposed. The system, based on the self-sustained gas lift principle, consists of multiple pipes (14 cm in diameter) with different intake depths; 12 pipes for Lake Nyos (four each at 185, 195 and 205 m) and three pipes for Lake Monoun (at 70, 80 and 90 m). The stepped degassing at different depths is intended to keep the maximum stability of the lakes. The proposed degassing operation was simulated using the dyresm code for both lakes. In 5 years, approximately 50% of currently dissolved CO2 in Lake Nyos and 90% in Lake Monoun will be removed. The expected changes in the thermal and chemical structures of the lakes as degassing proceeds will be most easily monitored with a carefully calibrated CTD equipped with a pH sensor. The simulation indicates that the discharged degassed water will sink to a level of neutral buoyancy, i.e. to a maximum of 70 m at Lake Nyos and 35 m at Lake Monoun. There would be no possibility of triggering a gas explosion by this plunge of discharged water because the water present there would have already been replaced by water at lower CO2 concentration, during the degassing from shallower pipes.” M Kusakabe, G.Z Tanyileke, S.A McCord, S.G Schladow, Journal of Volcanology and Geothermal Research, Volume 97, Issues 1-4, April 2000, Pages 241-260, doi:10.1016/S0377-0273(99)00170-5.

Possible asphyxiation from carbon dioxide of a cross-country skier in eastern California: a deadly volcanic hazard – Hill (2000) “This report describes an incident in which exceedingly high levels of carbon dioxide may have contributed to the death of a skier in eastern California. A cross-country skier was found dead inside a large, mostly covered snow cave, 1 day after he was reported missing. The autopsy report suggests that the skier died of acute pulmonary edema consistent with asphyxiation; carbon dioxide measurements inside the hole in which he was found reached 70%. This area is known for having a high carbon dioxide flux attributed to degassing of a large body of magma (molten rock) 10 to 20 km beneath the ski area. The literature describes many incidents of fatal carbon dioxide exposures associated with volcanic systems in other parts of the world. We believe this case represents the first reported death associated with volcanically produced carbon dioxide in the United States. Disaster and wilderness medicine specialists should be aware of and plan for this potential health hazard associated with active volcanoes.” Peter M. Hill, Wilderness & Environmental Medicine, Volume 11, Issue 3, September 2000, Pages 192-195, doi:10.1580/1080-6032(2000)011[0192:PAFCDO]2.3.CO;2.

Fatal intoxication due to an unexpected presence of carbon dioxide – Guillemin & Horisberger (1994) “A fatal accident which occurred in a tank containing a sludge made of wine and activated charcoal is described. Similar accidents in the wine industry seem to have never been reported before. Initially, the cause of death was not obvious and became clear only after the autopsy confirmed the presence of a very high concentration of carbon dioxide in blood. It is shown in this paper how the concentration of carbon dioxide in the tank could be estimated from its solubility in water, assuming a realistic content of this gas in the wine remaining in the sludge. Moreover the accident was analysed by the fault tree method which revealed that, as well as the deficiencies in risk management of such companies, the unsuspected presence of carbon dioxide played a significant role.” Michel P. Guillemin and B. Horisberger, Ann Occup Hyg (1994) 38 (6): 951-957. doi: 10.1093/annhyg/38.6.951.

CO2-rich gases from Lakes Nyos and Monoun, Cameroon; Laacher See, Germany; Dieng, Indonesia, and Mt. Gambier, Australia—variations on a common theme – Giggenbach et al. (1991) “Helium (RA = 3.0 to 5.6) and carbon (δ13C from −7.2 to −3.4‰) isotopic compositions, and relative CO2, CH4, N2, He and Ar contents of CO2-rich gases from Lakes Nyos and Monoun, Cameroon; Laacher See, Germany; Dieng Volcanic Plateau, Indonesia, and a well at Mt. Gambier, Australia, point to a common, essentially magmatic origin. … Otherwise, gas may accumulate to form a stable pocket (Mt. Gambier). Minor leakage from such pockets may lead to surface discharges of CO2-rich gases as at Laacher See, re-absorption into shallow groundwater to the formation of the low-salinity, CO2-charged waters encountered at Lakes Nyos and Monoun. The occurrence of these high-CO2, low-temperature systems is likely to be favored in tectonically active regions, allowing deep, possibly mantle gases to rise, but with sufficiently low regional heat flows to prevent the establishment of large-scale geothermal activity.” W.F. Giggenbach, Y. Sano, H.U. Schmincke, Journal of Volcanology and Geothermal Research, Volume 45, Issues 3-4, April 1991, Pages 311-323, doi:10.1016/0377-0273(91)90065-8.

Water and gas chemistry of Lake Nyos and its bearing on the eruptive process – W.F. Giggenbach (1990) “The isotopic and chemical composition of water samples collected from Lake Nyos some two and eight weeks after the eruption of August 21, 1986 point to the existence of three distinct mixing regimes involving three water components. An essentially homogeneous, unmixed body of water at depths > 100 m, overlain by water increasingly affected by surface evaporation and a 5–10-m layer containing recent, but pre-eruption rain water. The cationic constituents (Na, K, Mg, Ca, Mn, Fe) of the lake water correspond to the dissolution of around 0.1 g of local rock, the waters are close to saturation with respect to siderite. The composition of the gas dissolved in the deep lake waters (0.65% b.w. of CO2, PCO2 = 4.4b) corresponds (in mmol mol−1) to 996 CO2, 2.0 CH4, 2.0 N2, 0.05 Ar, 0.004 He, 0.0002 H2, 0.0001 Ne, < 0.01 O2, < 0.004 H2S, < 0.001 CO. The isotopic compositions of CO213C = -3.4‰) and of He (Rair = 5.5) suggest deep magmatic origins, the 13C and 2H content of CH4 organic sedimentary origin, the presence of aromatic hydrocarbons indicates very high temperatures of hydrocarbon formation. Exsolution of gas will first lead to the precipitation of siderite then iron hydroxide. The chemistry of the lake waters points to a loss of some 240,000 t of CO2 from the upper 100 m of the lake, their isotopic composition is consistent with the assumption that the eruption was triggered by the accumulation of cold rain waters at the lake surface prior to the eruption inducing partial convective overturn. There is no need to invoke addition of chemical or isotopic constituents from deeper levels during the eruption.” W.F. Giggenbach, Journal of Volcanology and Geothermal Research, Volume 42, Issue 4, 15 August 1990, Pages 337-362, doi:10.1016/0377-0273(90)90031-A.

The Lake Nyos gas disaster: chemical and isotopic evidence in waters and dissolved gases from three Cameroonian crater lakes, Nyos, Monoun and Wum – Kusakabe et al. (1989) “To better understand the cause of the Nyos gas disaster of August 21, 1986, we conducted geochemical and limnological surveys in October 1986, of three lakes (Nyos, Monoun and Wum) which are located in the Cameroon volcanic zone that is characterized by a prevalence of young alkaline basalts and basanitoids. … The August 1986 gas bursts from Lake Nyos were most likely caused by rapid exsolution of dissolved CO2 within the lake; an explosive process such as a phreatic eruption or a CO2 gas-jetting from beneath the bottom is unlikely because of low concentrations of Cl and SO42−, no oxygen isotopic shift, low turbidity, and no reported perturbation of the bottom sediments. Exsolution of CO2 bubbles could occur if CO2-saturated bottom water was displaced upwards by an increased influx of high salinity water from the bottom during the rainy season. Exsolution of CO2 at the upper layers was possibly accelerated by upwelling of a two-phase fluid (CO2 bubbles and solution), a mechanism known as a pneumatic lift pump, resulting in discharge of a large amount of CO2 gas. The H2S concentration in the gas cloud must have been kept far below the lethal level because of a high Fe2+ concentration of the lake water.” Minoru Kusakabe, Takashi Ohsumi, Shigeo Aramaki, Journal of Volcanology and Geothermal Research, Volume 39, Issues 2-3, November 1989, Pages 167-185, doi:10.1016/0377-0273(89)90056-5.

The gas cloud of Lake Nyos (Cameroon, 1986): Results of the Italian technical mission – Barberi et al. (1989) “On August 21, 1986, a gas cloud issued from Lake Nyos in Cameroon killed over 1700 people. An Italian technical mission reached the area seven days later and obtained the first field evidences of the catastrophe. On the basis of observations and measurements in the field and of samples collected, the origin of the gas outburst is attributed to a phreatic explosion from beneath the bed of the lake. This interpretation appears to fit well the observed and reported phenomena, and seems perfectly consistent with the geological-geothermal conditions of the area.” F. Barberi, W. Chelini, G. Marinelli, M. Martini, Journal of Volcanology and Geothermal Research, Volume 39, Issues 2-3, November 1989, Pages 125-134, doi:10.1016/0377-0273(89)90053-X.

Lake Nyos disaster, Cameroon, 1986: the medical effects of large scale emission of carbon dioxide? – Baxter et al. (1989) “Carbon dioxide was blamed for the deaths of around 1700 people in Cameroon, west Africa, in 1986 when a massive release of gas occurred from Lake Nyos, a volcanic crater lake. The clinical findings in 845 survivors seen at or admitted to hospital were compatible with exposure to an asphyxiant gas. Rescuers noted cutaneous erythema and bullae on an unknown proportion of corpses and 161 (19%) survivors treated in hospital; though these lesions were initially believed to be burns from acidic gases, further investigation suggested that they were associated with coma states caused by exposure to carbon dioxide in air. The disaster at Lake Nyos and a similar event at Lake Monoun, Cameroon, two years previously provide new information on the possible medical effects of large scale emissions of carbon dioxide, though the presence of other toxic factors in these gas releases cannot be excluded.” P. J. Baxter, M. Kapila, D. Mfonfu, BMJ 298 : 1437 doi: 10.1136/bmj.298.6685.1437 (Published 27 May 1989). [Full text]

Mechanisms of the Nyos carbon dioxide disaster and of so-called phreatic steam eruptions – Tazieff (1989) “During the night of August 21, 1986, a huge volume of concentrated CO2 was emitted by the crater (maar) of Nyos, Cameroon. It killed more than 1700 people and all animal life as far as 14 km away. Two hypotheses have been put forward to account for this disaster. The chronologically first one imputes it to have been a phreatic eruption, exceptionally CO2-rich, as had been the case in February 1979 on the Diëng Plateau in Central Java, Indonesia, where the erupting crater was lake-less. The second one claims a limnic origin for the CO2 release, through an overturn of the 220 m-deep Lake Nyos, the hypolimnium of which was supposed to be oversaturated by dissolved gas of volcanic origin. The present paper points to six observed facts for which the eruptive hypothesis easily accounts, and which the authors of the limnic one do ignore.” Haroun Tazieff, Journal of Volcanology and Geothermal Research, Volume 39, Issues 2-3, November 1989, Pages 109-116, doi:10.1016/0377-0273(89)90051-6.

Origin of carbon dioxide emanation from the 1979 Dieng eruption, Indonesia: Implications for the origin of the 1986 Nyos catastrophe – Allard et al. (1989) “In February 1979, CO2 emanations accompanying a phreatic eruption killed 142 people at Dieng volcano, Central Java. The gas emitted was nearly pure carbon dioxide, with subordinate amounts of methane and sulfur compounds. … It is proposed that magmatic carbon dioxide, accumulated beneath the Dieng volcanic complex, was the source of the lethal gas, the effusion of which was triggered by the pressure release generated by the phreatic eruption. The total CO2 discharge of the 1979 Dieng event might have approached 0.1 km3, i.e. close to the lower output estimated for the 1986 Nyos catastrophe. The Dieng example demonstrates that expansion and then effusion of pure magmatic carbon dioxide, accumulated at shallow levels beneath volcanoes, may account for a major hazard from phreatic eruptions, be it a trigger or only a consequence of the eruptions.” P. Allard, D. Dajlevic, C. Delarue, Journal of Volcanology and Geothermal Research, Volume 39, Issues 2-3, November 1989, Pages 195-206, doi:10.1016/0377-0273(89)90058-9.

Medical evaluation of the victims of the 1986 Lake Nyos disaster – Wagner et al. (1988) “A cloud of carbon dioxide gas, with an estimated volume of 1 km3 was released from Lake Nyos, a volcanic crater lake in Cameroon, Africa, causing 1700 to 2000 human fatalities as well as killing thousands of livestock and wild animals. At the request of the Cameroonian Government, the Office of Foreign Disaster Assistance of the U.S. Department of State sent a multidisciplinary team which included 2 forensic pathologists to assist the Government of Cameroon in investigating this natural disaster. The medical evaluation was concentrated in 3 areas: the autopsy of human and animal fatalities, examination and interview of survivors, and examination of the scene of the disaster. Toxicologic specimens were obtained at autopsy, and numerous samples of lake water were collected. The autopsy findings were consistent with asphyxia. The results of chemical analyses excluded many volatiles but not carbon dioxide as the toxic agent. The exact source of this gas continues to be a subject of a heated geologic debate, but fermentation of organic materials in the lake water has been eliminated on the basis of C14 isotope studies. This investigation underlines the value of forensic pathologists in epidemiological studies and in the examination of living persons.” Wagner GN, Clark MA, Koenigsberg EJ, Decata SJ., J Forensic Sci. 1988 Jul;33(4):899-909.

The 1986 Lake Nyos Gas Disaster in Cameroon, West Africa – Kling et al. (1987) “The sudden, catastrophic release of gas from Lake Nyos on 21 August 1986 caused the deaths of at least 1700 people in the northwest area of Cameroon, West Africa. Chemical, isotopic, geologic, and medical evidence support the hypotheses that (i) the bulk of gas released was carbon dioxide that had been stored in the lake’s hypolimnion, (ii) the victims exposed to the gas cloud died of carbon dioxide asphyxiation, (iii) the carbon dioxide was derived from magmatic sources, and (iv) there was no significant, direct volcanic activity involved. The limnological nature of the gas release suggests that hazardous lakes may be identified and monitored and that the danger of future incidents can be reduced.” George W. Kling, Michael A. Clark, Glen N. Wagner, Harry R. Compton, Alan M. Humphrey, Joseph D. Devine, William C. Evans, John P. Lockwood, Michele L. Tuttle and Edward J. Koenigsberg, Science 10 April 1987: Vol. 236 no. 4798 pp. 169-175, DOI: 10.1126/science.236.4798.169.

Origin of the lethal gas burst from Lake Monoun, Cameroun – Sigurdsson et al. (1987) “On 15 August, 1984, a lethal gas burst issued from a submerged 96-m-deep crater in Lake Monoun in Cameroun, western Africa, killing 37 people. The event was associated with a landslide from the eastern crater rim, which slumped into deep water. … Gases effervescing from depressurized deep waters are dominantly CO2 with minor CH4, having δ13C of −7.18 and −54.8 per mil, respectively. … The resultant ebullition of CO2 from deep lake waters led to a gas burst at the surface and locally generated a water wave up to 5 m high. People travelling through the gas cloud were asphyxiated, presumably from CO2, and suffered skin discoloration from unidentified components.” H. Sigurdsson, J.D. Devine, F.M. Tchua, F.M. Presser, M.K.W. Pringle, W.C. Evans, Journal of Volcanology and Geothermal Research, Volume 31, Issues 1-2, March 1987, Pages 1-16, doi:10.1016/0377-0273(87)90002-3.

An example of health hazard: People killed by gas during a phreatic eruption: Diëng plateau (Java, Indonesia), February 20th 1979 – Le Guern et al. (1982) “On February 20th, 1979, 142 inhabitants of Dieng Plateau (Indonesia) were asphyxiated by poisonous gases during a mild phreatic eruption. From later fields gas collection and analysis, the casualties are considered to be due to CO2 rich volcanic gases.” F. Le Guern, H. Tazieff and R. Faivre Pierret, Bulletin of Volcanology, Volume 45, Number 2, 153-156, DOI: 10.1007/BF02600430.

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