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

Belt, ST; Smik, L; Vogel, H; Peck, VL; Armbrecht, L; Cage, A; Cardillo, FG; Du, Z; Fauth, G; Fogwill, CJ; 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; Zheng, X; Weber, ME; Bailey, I; Hemming, SR; Martos, YM; Reilly, BT; Ronge, TA; Brachfeld, S; Williams, T; Raymo, M

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


Authors

ST Belt

L Smik

H Vogel

VL Peck

L Armbrecht

FG Cardillo

Z Du

G Fauth

CJ Fogwill

M Garcia

M Garnsworthy

A Glüder

M Guitard

M Gutjahr

I Hernández-Almeida

FS Hoem

J-H Hwang

M Iizuka

Y Kato

B Kenlee

S OConnell

LF Pérez

O Seki

L Stevens

L Tauxe

S Tripathi

J Warnock

X Zheng

ME Weber

I Bailey

SR Hemming

YM Martos

BT Reilly

TA Ronge

S Brachfeld

T Williams

M Raymo



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.

Acceptance Date Mar 25, 2022
Publication Date Apr 19, 2022
Journal Nature Communications
Print ISSN 2041-1723
Pages 2044 - ?
DOI https://doi.org/10.1038/s41467-022-29642-5
Keywords cryospheric science; palaeoceanography
Publisher URL https://www.nature.com/articles/s41467-022-29642-5?msclkid=a13e9bb7cf7211ec907b51b717e28d6f#article-info

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