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Publication:
Southern Ocean upwelling, Earth’s obliquity, and glacial-interglacial atmospheric CO 2 change

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dc.contributor.authorAi, Xuyuan E.
dc.contributor.authorStuder, Anja S.
dc.contributor.authorSigman, Daniel M.
dc.contributor.authorMartínez-García, Alfredo
dc.contributor.authorFripiat, François
dc.contributor.authorThöle, Lena M.
dc.contributor.authorMichel, Elisabeth
dc.contributor.authorGottschalk, Julia
dc.contributor.authorArnold, Laura
dc.contributor.authorMoretti, Simone
dc.contributor.authorSchmitt, Mareike
dc.contributor.authorOleynik, Sergey
dc.contributor.authorJaccard, Samuel
dc.contributor.authorHaug, Gerald H.
dc.date.accessioned2024-09-02T16:37:42Z
dc.date.available2024-09-02T16:37:42Z
dc.date.issued2020
dc.description.abstractPrevious 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.
dc.description.numberOfPages5
dc.description.sponsorshipInstitut für Geologie
dc.identifier.doi10.7892/boris.149574
dc.identifier.publisherDOI10.1126/science.abd2115
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/38754
dc.language.isoen
dc.publisherAmerican Association for the Advancement of Science
dc.relation.ispartofScience
dc.relation.issn0036-8075
dc.relation.organizationDCD5A442C08FE17DE0405C82790C4DE2
dc.relation.organizationDCD5A442C18FE17DE0405C82790C4DE2
dc.subject.ddc500 - Science::550 - Earth sciences & geology
dc.titleSouthern Ocean upwelling, Earth’s obliquity, and glacial-interglacial atmospheric CO 2 change
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage1352
oaire.citation.issue6522
oaire.citation.startPage1348
oaire.citation.volume370
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oairecerif.author.affiliationInstitut für Geologie
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unibe.date.licenseChanged2020-12-22 09:10:42
unibe.description.ispublishedpub
unibe.eprints.legacyId149574
unibe.journal.abbrevTitleSCIENCE
unibe.refereedTRUE
unibe.subtype.articlejournal

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