AGW Observer

Observations of anthropogenic global warming

Some things I wrote about during summer

Posted by Ari Jokimäki on September 1, 2010

As I noted in february, I’m writing also some newsarticles in Finnish to our blog. I then said that I might publish some of the articles in English in here too. Recently, I have been rather lazy translating the articles to English and I have also thought that there might be not much point in that as the information I write about already exists in English. Here, I’ll just point out some of the research articles I have been reporting:

Six millennia of summer temperature variation based on midge analysis of lake sediments from Alaska – Clegg et al. (2010). Reports about generally cooling July temperatures in Alaska since 4000 BP and to mid 20th century. The abstract doesn’t mention modern temperatures but checking nearby stations suggests that modern temperature might be very close to highest Holocene temperatures that occurred in 6000-4000 BP in that site, and clearly higher than MWP. Both MWP and LIA show up clearly in the reconstruction. (Here’s the reconstruction data and the graph I made. For futher information on the research method – midge remains in lake sediments – in Brodersen & Anderson, 2000.)

Have disaster losses increased due to anthropogenic climate change? – Bouwer (2010). Disaster losses don’t seem to be clearly attributable to climate change yet. (Full text.)

– Two papers on future changes in Europe and in Arctic:

21st century changes in the European climate: uncertainties derived from an ensemble of regional climate model simulations – Kjellström et al. (2010). Europe warms considerably already in next decades. Precipitation increases in northern and decreases in southern Europe. Wind speed decreases in many areas with some exceptions.

Arctic future scenario experiments with a coupled regional climate model – Koenigk et al. (2010). Arctic warms more in their regional model runs than in global model runs. According to IPCC, this is because regional models have more realistic simulation of snow cover.

Collapse of the Maya: Could deforestation have contributed? – Oglesby et al. (2010). The fall of Mayan civilisation might have been aided by Mayan lumberjacks getting carried away…

Wintering French Mallard and Teal Are Heavier and in Better Body Condition than 30 Years Ago: Effects of a Changing Environment? – Guillemain et al. (2010). Are modern ducks so urbanized that they take fitness-classes? Ducks are more massive and more fit than 30 years ago. Probable causes are climate change and improvements in local conditions.

Projected changes in thermal seasons and the growing season in Finland – Ruosteenoja et al. (2010). Seasons will change in Finland during this century. The winter will disappear from southern Finland (where I live – there have been some samples of this already in recent years) and the growth season gets longer by a month in the whole country.

Greenhouse gas fluxes in a drained peatland forest during spring frost-thaw event – Pihlatie et al. (2010). Some basic research on peatland emissions. (Full text.)

Arctic marine climate of the early nineteenth century – Brohan et al. (2010). Point here is that they have started digitizing the weather observations from ship logbooks, first results in this paper. (Full textdata from logbooks is available here.)

Response of the ice cap Hardangerjøkulen in southern Norway to the 20th and 21st century climates – Giesen & Oerlemans (2010). In hundred years the Hardangerjøkulen glacier is no more. (Full text.)

Erosion of Lizard Diversity by Climate Change and Altered Thermal Niches – Sinervo et al. (2010). Lizard populations are vanishing before our eyes.

Permanent El Niño and the onset of Northern Hemisphere glaciations: Mechanism and comparison with other hypotheses – Vizcaino et al. (2010). Early Pliocene was warmer than today and there was a permanent El Niño. The fading out of the permanent El Niño is suggested to be one of the causes that lead to northern hemisphere glaciation. Is there a permanent El Niño in our future? (Full text.)

Effects of sea ice on atmospheric pCO2: A revised view and implications for glacial and future climates – Sun & Matsumoto (2010). The carbon dioxide level in atmosphere gets higher when sea ice extent decreases because of gas solubility changes.

Climate change in cities due to global warming and urban effects – McCarthy et al. (2010). Future cities will be really hot due to climate change and urban heating.

Vegetation response to the “African Humid Period” termination in Central Cameroon (7° N) – new pollen insight from Lake Mbalang – Vincens et al. (2010). Ancient pollen sequence describes how certain area in Cameroon changed from rain forest to a savannah. (Full text.)

Volcanic ash as fertiliser for the surface ocean – Langmann et al. (2010). Kasatochi volcano erupted and fertilized the NE Pacific. (Full text. Chlorofyll observations from NE Pacific during the event.)

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