ST Belt
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
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.
Acceptance Date | Mar 25, 2022 |
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Publication Date | Apr 19, 2022 |
Publicly Available Date | Mar 29, 2024 |
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 |
Files
s41467-022-29642-5.pdf
(6.9 Mb)
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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
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