Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years

Weber, Michael E.; Bailey, Ian; Hemming, Sidney R.; Martos, Yasmina M.; Reilly, Brendan T.; Ronge, Thomas A.; Brachfeld, Stefanie; Williams, Trevor; Raymo, Maureen; Belt, Simon T.; Smik, Lukas; Peck, Victoria L. ORCID: https://orcid.org/0000-0002-7948-6853; Armbrecht, Linda; Cage, Alix; Cardillo, Fabricio G.; Du, Zhiheng; Fauth, Gerson; Fogwill, Christopher J.; Garcia, Marge; Garnsworthy, Marlo; Glüder, Anna; Guitard, Michelle; Gutjahr, Marcus; Hernández-Almeida, Iván; Hoem, Frida S.; Hwang, Ji-Hwan; Iizuka, Mutsumi; Kato, Yuji; Kenlee, Bridget; OConnell, Suzanne; Pérez, Lara F.; Seki, Osamu; Stevens, Lee; Tauxe, Lisa; Tripathi, Shubham; Warnock, Jonathan; Zheng, Xufeng. 2022 Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years. Nature Communications, 13, 2044. https://doi.org/10.1038/s41467-022-29642-5

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Official URL: https://www.nature.com/articles/s41467-022-29642-5

Abstract/Summary

The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report a high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.5 Ma, thus doubling that from Antarctic ice-cores. We find a 5 to 15-fold increase in dust deposition during glacials and a 2 to 5-fold increase in biogenic silica deposition, reflecting higher ocean productivity during interglacials. This antiphasing persisted throughout the last 25 glacial cycles. Dust deposition became more pronounced across the Mid-Pleistocene Transition (MPT) in the Southern Hemisphere, with an abrupt shift suggesting more severe glaciations since ~0.9 Ma. Productivity was intermediate pre-MPT, lowest during the MPT and highest since 0.4 Ma. Generally, glacials experienced extended sea-ice cover, reduced bottom-water export and Weddell Gyre dynamics, which helped lower atmospheric CO2 levels.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1038/s41467-022-29642-5
ISSN:	0028-0836
Date made live:	25 Apr 2022 10:35 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529599

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1038/s41467-022-29642-5

ISSN:

0028-0836

Date made live:

25 Apr 2022 10:35 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/529599