Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change
Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice...
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ftpubman:oai:pure.mpg.de:item_3287077 2023-08-27T04:05:31+02:00 Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change Ai, X. Studer, A. Sigman, D. Martinez-Garcia, A. Fripiat, F. Thole, L. Michel, E. Gottschalk, J. Arnold, L. Moretti, S. Schmitt, M. Oleynik, S. Jaccard, S. Haug, G. 2020-12-11 http://hdl.handle.net/21.11116/0000-0008-0394-D unknown info:eu-repo/semantics/altIdentifier/doi/10.1126/science.abd2115 http://hdl.handle.net/21.11116/0000-0008-0394-D Science info:eu-repo/semantics/article 2020 ftpubman https://doi.org/10.1126/science.abd2115 2023-08-02T01:56:00Z Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice ages. Here, high-resolution diatom-bound nitrogen isotope measurements from the Indian sector of the Antarctic Zone reveal three modes of change in Southern Westerly Wind–driven upwelling, each affecting atmospheric carbon dioxide. Two modes, related to global climate and the bipolar seesaw, have been proposed previously. The third mode—which arises from the meridional temperature gradient as affected by Earth’s obliquity (axial tilt)—can explain the lag of atmospheric carbon dioxide behind climate during glacial inception and deglaciation. This obliquity-induced lag, in turn, makes carbon dioxide a delayed climate amplifier in the late Pleistocene glacial cycles. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Max Planck Society: MPG.PuRe Antarctic Indian Southern Ocean The Antarctic Science 370 6522 1348 1352 |
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Max Planck Society: MPG.PuRe |
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Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice ages. Here, high-resolution diatom-bound nitrogen isotope measurements from the Indian sector of the Antarctic Zone reveal three modes of change in Southern Westerly Wind–driven upwelling, each affecting atmospheric carbon dioxide. Two modes, related to global climate and the bipolar seesaw, have been proposed previously. The third mode—which arises from the meridional temperature gradient as affected by Earth’s obliquity (axial tilt)—can explain the lag of atmospheric carbon dioxide behind climate during glacial inception and deglaciation. This obliquity-induced lag, in turn, makes carbon dioxide a delayed climate amplifier in the late Pleistocene glacial cycles. |
format |
Article in Journal/Newspaper |
author |
Ai, X. Studer, A. Sigman, D. Martinez-Garcia, A. Fripiat, F. Thole, L. Michel, E. Gottschalk, J. Arnold, L. Moretti, S. Schmitt, M. Oleynik, S. Jaccard, S. Haug, G. |
spellingShingle |
Ai, X. Studer, A. Sigman, D. Martinez-Garcia, A. Fripiat, F. Thole, L. Michel, E. Gottschalk, J. Arnold, L. Moretti, S. Schmitt, M. Oleynik, S. Jaccard, S. Haug, G. Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
author_facet |
Ai, X. Studer, A. Sigman, D. Martinez-Garcia, A. Fripiat, F. Thole, L. Michel, E. Gottschalk, J. Arnold, L. Moretti, S. Schmitt, M. Oleynik, S. Jaccard, S. Haug, G. |
author_sort |
Ai, X. |
title |
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
title_short |
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
title_full |
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
title_fullStr |
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
title_full_unstemmed |
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO 2 change |
title_sort |
southern ocean upwelling, earth's obliquity, and glacial-interglacial atmospheric co 2 change |
publishDate |
2020 |
url |
http://hdl.handle.net/21.11116/0000-0008-0394-D |
geographic |
Antarctic Indian Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Science |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1126/science.abd2115 http://hdl.handle.net/21.11116/0000-0008-0394-D |
op_doi |
https://doi.org/10.1126/science.abd2115 |
container_title |
Science |
container_volume |
370 |
container_issue |
6522 |
container_start_page |
1348 |
op_container_end_page |
1352 |
_version_ |
1775357236093124608 |