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

doi:10.1038/s41467-022-29642-5

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

Authors

ST Belt

L Smik

H Vogel

VL Peck

L Armbrecht

Alix Cage a.g.cage@keele.ac.uk

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.

Citation

Belt, S., Smik, L., Vogel, H., Peck, V., Armbrecht, L., Cage, A., …Raymo, M. (2022). Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years. Nature communications, 2044 - ?. https://doi.org/10.1038/s41467-022-29642-5

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