Reconstruction of atmospheric CO2 from ice-core data and the deep-sea record of ontong Java plateau: the Milankovitch chron |
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Authors: | Wolfgang H Berger Memorie K Yasuda Torsten Bickert Gerold Wefer |
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Institution: | 1. Scripps Institution of Oceanography, University of California, 92093-0215, San Diego, California, USA 2. Geowissenschaften, Universit?t Bremen, D-28334, Bremen, Germany
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Abstract: | We provide a reconstruction of atmospheric CO2 from deep-sea sediments, for the past 625000 years (Milankovitch chron). Our database consists of a Milankovitch template
of sea-level variation in combination with a unique data set for the deep-sea record for Ontong Java plateau in the western
equatorial Pacific. We redate the Vostok ice-core data of Barnola et al. (1987). To make the reconstructions we employ multiple
regression between deep-sea data, on one hand, and ice-core CO2 data in Antarctica, on the other. The patterns of correlation suggest that the main factors controlling atmospheric CO2 can be described as a combination of sea-level state and sea-level change. For best results squared values of state and change
are used. The square-of-sea-level rule agrees with the concept that shelf processes are important modulators of atmospheric
CO2 (e.g., budgets of shelf organic carbon and shelf carbonate, nitrate reduction). The square-of-change rule implies that, on
short timescales, any major disturbance of the system results in a temporary rise in atmospheric CO2. |
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Keywords: | Quaternary CO2 Ontong Java plateau Deep-sea carbonate Milankovitch Oxygen isotope record |
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