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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High-resolution record of Northern Hemisphere climate extending into the last interglacial period.
Katrine Krogh Andersen,Nobuhiko Azuma,Jean-Marc Barnola,M. Bigler,Pierre E. Biscaye,Nicolas Caillon,Jérôme Chappellaz,H. B. Clausen,Dorthe Dahl-Jensen,Hubertus Fischer,Jacqueline Flückiger,Diedrich Fritzsche,Yoshiyuki Fujii,Kumiko Goto-Azuma,Karl Grönvold,Niels S. Gundestrup,Margareta Hansson,Christof Huber,Christine S. Hvidberg,Sigfus J Johnsen,Ulf Jonsell,Jean Jouzel,S. Kipfstuhl,Amaelle Landais,Markus Leuenberger,Regi D. Lorrain,Valérie Masson-Delmotte,Heinrich Miller,Hideaki Motoyama,Hideki Narita,Trevor Popp,Sune Olander Rasmussen,Dominique Raynaud,R. Röthlisberger,U. Ruth,Denis Samyn,Jakob Schwander,Hitoshi Shoji,M. L. Siggard-Andersen,Jørgen Peder Steffensen,Thomas F. Stocker,A. E. Sveinbjörnsdottir,Anders Svensson,Morimasa Takata,Jean-Louis Tison,T. Thorsteinsson,Okitsugu Watanabe,Frank Wilhelms,James W. C. White +48 more
TL;DR: An undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period, shows a slow decline in temperatures that marked the initiation of the last glacial period.
Orbital and Millennial Antarctic Climate Variability over the Past 800,000 Years
Jean Jouzel,Valérie Masson-Delmotte,O. Cattani,Gabrielle Dreyfus,S. Falourd,G. P. Hoffmann,Bénédicte Minster,Julius Nouet,Jean-Marc Barnola,Jérôme Chappellaz,Hubertus Fischer,J. C. Gallet,Sigfus J Johnsen,Sigfus J Johnsen,Markus Leuenberger,L. Loulergue,D. Luethi,Hans Oerter,Frédéric Parrenin,Grant M. Raisbeck,Dominique Raynaud,Adrian Schilt,Jakob Schwander,Enricomaria Selmo,Roland Souchez,Renato Spahni,Bernhard Stauffer,Jørgen Peder Steffensen,Barbara Stenni,Thomas F. Stocker,Jean-Louis Tison,Martin Werner,Eric W. Wolff +32 more
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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