TY - JOUR
T1 - Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years
AU - Weber, Michael E.
AU - Bailey, Ian
AU - Hemming, Sidney R.
AU - Martos, Yasmina M.
AU - Reilly, Brendan T.
AU - Ronge, Thomas A.
AU - Brachfeld, Stefanie
AU - Williams, Trevor
AU - Raymo, Maureen
AU - Belt, Simon T.
AU - Smik, Lukas
AU - Vogel, Hendrik
AU - Peck, Victoria L.
AU - Armbrecht, Linda
AU - Cage, Alix
AU - Cardillo, Fabricio G.
AU - Du, Zhiheng
AU - Fauth, Gerson
AU - Fogwill, Christopher J.
AU - Garcia, Marga
AU - Garnsworthy, Marlo
AU - Glüder, Anna
AU - Guitard, Michelle
AU - Gutjahr, Marcus
AU - Hernández-Almeida, Iván
AU - Hoem, Frida S.
AU - Hwang, Ji Hwan
AU - Iizuka, Mutsumi
AU - Kato, Yuji
AU - Kenlee, Bridget
AU - OConnell, Suzanne
AU - Pérez, Lara F.
AU - Seki, Osamu
AU - Stevens, Lee
AU - Tauxe, Lisa
AU - Tripathi, Shubham
AU - Warnock, Jonathan
AU - Zheng, Xufeng
N1 - Publisher Copyright:
© 2022, The Author(s).
PY - 2022/4/19
Y1 - 2022/4/19
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85128348255
UR - https://pearl.plymouth.ac.uk/gees-research/791/
U2 - 10.1038/s41467-022-29642-5
DO - 10.1038/s41467-022-29642-5
M3 - Article
C2 - 35440628
SN - 2041-1723
VL - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 2044
ER -