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

Michael E. Weber (), Ian Bailey, Sidney R. Hemming, Yasmina M. Martos, Brendan T. Reilly, Thomas A. Ronge, Stefanie Brachfeld, Trevor Williams, Maureen Raymo, Simon T. Belt, Lukas Smik, Hendrik Vogel, Victoria L. Peck, Linda Armbrecht, Alix Cage, Fabricio G. Cardillo, Zhiheng Du, Gerson Fauth, Christopher J. Fogwill, Marga Garcia, Marlo Garnsworthy, Anna Glüder, Michelle Guitard, Marcus Gutjahr, Iván Hernández-Almeida, Frida S. Hoem, Ji-Hwan Hwang, Mutsumi Iizuka, Yuji Kato, Bridget Kenlee, Suzanne OConnell, Lara F. Pérez, Osamu Seki, Lee Stevens, Lisa Tauxe, Shubham Tripathi, Jonathan Warnock and Xufeng Zheng
Additional contact information
Michael E. Weber: University of Bonn
Ian Bailey: University of Exeter
Sidney R. Hemming: Columbia University
Yasmina M. Martos: Planetary Magnetospheres Laboratory
Brendan T. Reilly: University of California San Diego
Thomas A. Ronge: Helmholtz Center for Polar and Marine Research
Stefanie Brachfeld: Montclair State University
Trevor Williams: Texas AM University
Maureen Raymo: Columbia University
Simon T. Belt: University of Plymouth
Lukas Smik: University of Plymouth
Hendrik Vogel: University of Bern
Victoria L. Peck: British Antarctic Survey
Linda Armbrecht: University of Tasmania
Alix Cage: Keele University
Fabricio G. Cardillo: Servicio de Hidrografia Naval, Ministerio de Defensa
Zhiheng Du: Northwest Institute of Eco-Environment and Resources
Gerson Fauth: University of Vale do Rio dos Sinos
Christopher J. Fogwill: Cranfield University
Marga Garcia: Andalusian Institute of Earth Science (CSIC-UGR)
Marlo Garnsworthy: Wordy Bird Studio
Anna Glüder: Oregon State University
Michelle Guitard: University of South Florida
Marcus Gutjahr: GEOMAR Helmholtz Centre for Ocean Research Kiel
Iván Hernández-Almeida: ETH Zurich
Frida S. Hoem: Utrecht University
Ji-Hwan Hwang: Pukyong National University
Mutsumi Iizuka: Tokyo City University, Tokyo
Yuji Kato: University of Tsukuba
Bridget Kenlee: University of California Riverside
Suzanne OConnell: Wesleyan University
Lara F. Pérez: Geological Survey of Denmark and Greenland
Osamu Seki: Hokkaido University
Lee Stevens: American Museum of Natural History
Lisa Tauxe: University of California San Diego
Shubham Tripathi: Marine Stable Isotope Lab, National Centre for Polar and Ocean Research, Ministry of Earth Sciences
Jonathan Warnock: Indiana University of Pennsylvania
Xufeng Zheng: Hainan University

Nature Communications, 2022, vol. 13, issue 1, 1-18

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-29642-5

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