Document Type
Article
Publication Date
8-1-2022
Journal / Book Title
Paleoceanography and Paleoclimatology
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 interglacial.
DOI
10.1029/2021PA004394
Journal ISSN / Book ISBN
85136903215 (Scopus)
MSU Digital Commons Citation
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., "Latitudinal Variance in the Drivers and Pacing of Warmth During Mid-Pleistocene MIS 31 in the Antarctic Zone of the Southern Ocean" (2022). Department of Earth and Environmental Studies Faculty Scholarship and Creative Works. 718.
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/718
Published Citation
Warnock, J. P., Reilly, B. T., Raymo, M. E., Weber, M. E., Peck, V., Williams, T., et al. (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, e2021PA004394. https://doi.org/10.1029/2021PA004394
Comments
© 2022 American Geophysical Union. All Rights Reserved. This article is being shared in accordance with the AGU self-archiving policy.