Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change

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Serval ID
serval:BIB_150FFD897D00
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change
Journal
Science
Author(s)
Ai Xuyuan E., Studer Anja S., Sigman Daniel M., Martínez-García Alfredo, Fripiat François, Thöle Lena M., Michel Elisabeth, Gottschalk Julia, Arnold Laura, Moretti Simone, Schmitt Mareike, Oleynik Sergey, Jaccard Samuel L., Haug Gerald H.
ISSN
0036-8075
1095-9203
Publication state
Published
Issued date
11/12/2020
Peer-reviewed
Oui
Volume
370
Number
6522
Pages
1348-1352
Language
english
Abstract
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.
Keywords
Multidisciplinary
Funding(s)
Swiss National Science Foundation / Careers / PP00P2_172915
Swiss National Science Foundation / Careers / PP00P2_144811
Create date
11/12/2020 9:13
Last modification date
08/01/2021 6:24
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