Sentences with phrase «by polar ice cores»

Not exact matches

Wenk Physics Institute, University of Bern, CH — 3012 Bern, Sidlerstrasse 5, Switzerland Studies on air trapped in old polar ice1, 2 have shown that during the last ice age, the atmospheric carbon dioxide concentration was probably significantly lower than during the Holocene — about 200 p.p.m. rather than 270 p.p.m.. Also, Stauffer et al. 3 recently showed by detailed analyses of Greenland ice cores, that during the ice age, between about 30,000 and 40,000 yr BP, the atmospheric CO2 level probably varied between 200 and 260 p.p.m..

They determined this by taking ice cores 400 miles from the South Pole in the polar plateau of East Antarctica.

The following are more of interest: — «Winter Sampling of Shallow Firn Air at the South Pole to Understand Processes Affecting Firn Atmospheric Histories and Ice Core Gas Records» by Severinghaus (2000), — «Thermal fractionation of air in polar firn by seasonal temperature gradients» by Severinghaus, Grachev & Battle (2001), — «Severinghaus et al. «Fractionation of gases in polar ice during bubble close - off: New constraints from firn air Ne, Kr and Xe observations» by Severinghaus & Battle (2006), but all follow the same line of reasoniIce Core Gas Records» by Severinghaus (2000), — «Thermal fractionation of air in polar firn by seasonal temperature gradients» by Severinghaus, Grachev & Battle (2001), — «Severinghaus et al. «Fractionation of gases in polar ice during bubble close - off: New constraints from firn air Ne, Kr and Xe observations» by Severinghaus & Battle (2006), but all follow the same line of reasoniice during bubble close - off: New constraints from firn air Ne, Kr and Xe observations» by Severinghaus & Battle (2006), but all follow the same line of reasoning.

This paper, cosignated by Bard as last author, seems to be the paper too much, too much, trop trop trop for him; it has a smell of pine tree (or coffin) as that of the «scientific» carrier of M.Mann It looks a bit bizarre to me that it would be revolutionnary that temperatures of Northern Atlantic and tropical environments do not lag that of polar environments and ice, while the sun irradiates more the poles to the detriment of tropical latitudes; really, as long, as they do not demonstrate that CO2 does not lag temperature in ice cores, there is nothing new; and if they do, we are waiting for the explanations of vice président Jouzel to find the source of CO2 before the deep polar oceans started to moove