Latitudinal Variance in the Drivers and Pacing of Warmth During Mid‐Pleistocene MIS 31 in the Antarctic Zone of the Southern Ocean.

Warnock, Jonathan P., Reilly, Brendan T., Raymo, Maureen E., Weber, Michael E., Peck, Victoria, Williams, Trevor, Armbrecht, Linda, Bailey, Ian, Brachfeld, Stefanie, Du, Zhiheng, Fauth, Gerson, García, Marga M., Glüder, Anna, Guitard, Michelle, Gutjahr, Marcus , Hemming, Sidney, Hernández‐Almeida, Iván, Hoem, Freida S., Hwang, Ji‐Hwan, Iizuka, Mutsumi, Kato, Yuji, Lee, Bridget, Martos, Yasmina M., O’Connell, Suzanne, Pérez, Lara F., Ronge, Thomas A., Seki, Osamu, Tauxe, Lisa, Tripathi, Shubham, Zheng, Xufeng, Stoner, Joseph and Scherer, Reed P. (2022) Latitudinal Variance in the Drivers and Pacing of Warmth During Mid‐Pleistocene MIS 31 in the Antarctic Zone of the Southern Ocean. Paleoceanography and Paleoclimatology, 37 (8). e2021PA00439. DOI 10.1029/2021PA004394.

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Abstract

Early Pleistocene Marine Isotope Stage (MIS)-31 (1.081–1.062 Ma) is a unique interval of extreme global warming, including evidence of a West Antarctic Ice Sheet (WAIS) collapse. Here we present a new 1,000-year resolution, spanning 1.110–1.030 Ma, diatom-based reconstruction of primary productivity, relative sea surface temperature changes, sea-ice proximity/open ocean conditions and diatom species absolute abundances during MIS-31, from the Scotia Sea (59°S) using deep-sea sediments collected during International Ocean Discovery Program (IODP) Expedition 382. The lower Jaramillo magnetic reversal (base of C1r.1n, 1.071 Ma) provides a robust and independent time-stratigraphic marker to correlate records from other drill cores in the Antarctic Zone of the Southern Ocean (AZSO). An increase in open ocean species Fragilariopsis kerguelensis in early MIS-31 at 53°S (Ocean Drilling Program Site 1,094) correlates with increased obliquity forcing, whereas at 59°S (IODP Site U1537; this study) three progressively increasing, successive peaks in the relative abundance of F. kerguelensis correlate with Southern Hemisphere-phased precession pacing. These observations reveal a complex pattern of ocean temperature change and sustained sea surface temperature increase lasting longer than a precession cycle within the Atlantic sector of the AZSO. Timing of an inferred WAIS collapse is consistent with delayed warmth (possibly driven by sea-ice dynamics) in the southern AZSO, supporting models that indicate WAIS sensitivity to local sub-ice shelf melting. Anthropogenically enhanced impingement of relatively warm water beneath the ice shelves today highlights the importance of understanding dynamic responses of the WAIS during MIS-31, a warmer than Holocene interglacia

Document Type: Article
Keywords: Antarctic ice sheet; climate change; cryosphere; diatoms; Southern Ocean
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Scripps
HGF-AWI
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union), Wiley
Projects: IODP
Expeditions/Models/Experiments:
Date Deposited: 21 Sep 2022 10:32
Last Modified: 21 Sep 2022 10:32
URI: https://oceanrep.geomar.de/id/eprint/57060

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