High-resolution carbon dioxide concentration record 650,000–800,000 years before present
Dieter Lüthi,Martine Le Floch,Bernhard Bereiter,Thomas Blunier,Jean-Marc Barnola,Urs Siegenthaler,Dominique Raynaud,Jean Jouzel,Hubertus Fischer,Kenji Kawamura,Thomas F. Stocker +10 more
TL;DR: It is found that atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles but with significantly lower concentrations between 650,000 and 750,000 yr before present, which extends the pre-industrial range of carbon dioxide concentrations during the late Quaternary by about 10 p.p.m.v.
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Abstract: Changes in past atmospheric carbon dioxide concentrations can be determined by measuring the composition of air trapped in ice cores from Antarctica. So far, the Antarctic Vostok and EPICA Dome C ice cores have provided a composite record of atmospheric carbon dioxide levels over the past 650,000 years. Here we present results of the lowest 200 m of the Dome C ice core, extending the record of atmospheric carbon dioxide concentration by two complete glacial cycles to 800,000 yr before present. From previously published data and the present work, we find that atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles but with significantly lower concentrations between 650,000 and 750,000 yr before present. Carbon dioxide levels are below 180 parts per million by volume (p.p.m.v.) for a period of 3,000 yr during Marine Isotope Stage 16, possibly reflecting more pronounced oceanic carbon storage. We report the lowest carbon dioxide concentration measured in an ice core, which extends the pre-industrial range of carbon dioxide concentrations during the late Quaternary by about 10 p.p.m.v. to 172-300 p.p.m.v.
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Eco-environmental changes in the Chinese Loess Plateau during low-eccentricity interglacial Marine Isotope Stage 19
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TL;DR: In this paper, high-resolution terrestrial snail records from the L8-L7 strata of the Huining, Xifeng and Luochuan sequences in the Chinese Loess Plateau (CLP) were analyzed in order to characterize spatio-temporal changes in climate and eco-environment during MIS 20-18.
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TL;DR: In this paper , the authors reconstruct the long-term evolution of terrestrial C3-C4 plants biomass in South China since the late Eocene using continuous records of the stable carbon isotopic compositions (δ13C) of black carbon extracted from sediments at International Ocean Discovery Program (IODP) Site U1501 in the northern South China Sea (SCS).
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A permafrost glacial hypothesis to explain atmospheric CO 2 and the ice ages during the Pleistocene
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TL;DR: In this paper, the authors provide a brief overview of climate changes leading up to the last ice age, then overviews the changes in Arctic climate during the Quaternary, and suggest that Arctic temperature changes have been 3 to 4 times the corresponding hemispheric or globally averaged changes.
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TL;DR: It is suggested that the interplay between obliquity and precession accounts for the variable intensity of interglacial periods in ice core records.
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