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Early sea ice decline off East Antarctica at the last glacial-interglacial climate transition.
- Source :
-
Science advances [Sci Adv] 2023 Oct 13; Vol. 9 (41), pp. eadh9513. Date of Electronic Publication: 2023 Oct 12. - Publication Year :
- 2023
-
Abstract
- Antarctic climate warming and atmospheric CO <subscript>2</subscript> rise during the last deglaciation may be attributed in part to sea ice reduction in the Southern Ocean. Yet, glacial-interglacial Antarctic sea ice dynamics and underlying mechanisms are poorly constrained, as robust sea ice proxy evidence is sparse. Here, we present a molecular biomarker-based sea ice record that resolves the spring/summer sea ice variability off East Antarctica during the past 40 thousand years (ka). Our results indicate that substantial sea ice reduction culminated rapidly and contemporaneously with upwelling of carbon-enriched waters in the Southern Ocean at the onset of the last deglaciation but began at least ~2 ka earlier probably driven by an increasing local integrated summer insolation. Our findings suggest that sea ice reduction and associated feedbacks facilitated stratification breakup and outgassing of CO <subscript>2</subscript> in the Southern Ocean and warming in Antarctica but may also have played a leading role in initializing these deglacial processes in the Southern Hemisphere.
Details
- Language :
- English
- ISSN :
- 2375-2548
- Volume :
- 9
- Issue :
- 41
- Database :
- MEDLINE
- Journal :
- Science advances
- Publication Type :
- Academic Journal
- Accession number :
- 37824627
- Full Text :
- https://doi.org/10.1126/sciadv.adh9513