Weber, ME, Bailey, I, Hemming, SR, Martos, YM, Reilly, BT, Ronge, TA, Brachfeld, S, Williams, T, Raymo, M, Belt, ST, Smik, L, Vogel, H, Peck, VL, Armbrecht, L, Cage, A, Cardillo, FG, Du, Z, Fauth, G, Fogwill, CJ ORCID: https://orcid.org/0000-0002-6471-1106, Garcia, M, Garnsworthy, M, Glüder, A, Guitard, M, Gutjahr, M, Hernández-Almeida, I, Hoem, FS, Hwang, J-H, Iizuka, M, Kato, Y, Kenlee, B, OConnell, S, Pérez, LF, Seki, O, Stevens, L, Tauxe, L, Tripathi, S, Warnock, J and Zheng, X (2022) Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years. Nature Communications, 13 (1). 2044 - ?.

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Abstract

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: Article
Additional Information: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Uncontrolled Keywords: cryospheric science; palaeoceanography
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
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Depositing User: Symplectic
Date Deposited: 09 May 2022 08:35
Last Modified: 09 May 2022 08:35
URI: https://eprints.keele.ac.uk/id/eprint/10866

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