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

Ai, Xuyuan E. and Studer, Anja S. and Sigman, Daniel M. and Martínez-García, Alfredo and Fripiat, François and Thole, Lena M. and Michel, Elisabeth and Gottschalk, Julia and Arnold, Laura and Moretti, Simone and Schmitt, Mareike and Oleynik, Sergey and Jaccard, Samuel L. and Haug, Gerald H.. (2020) Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change. Science, 370 (6522). pp. 1348-1352.

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Aquatic and Isotope Biogeochemistry (Lehmann)
UniBasel Contributors:Studer, Anja
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association for the Advancement of Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:17 Jun 2023 03:10
Deposited On:03 Nov 2021 16:09

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