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

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dc.contributor.authorBelt, Simon T.
dc.contributor.authorSmik, Lukas
dc.contributor.authorVogel, Hendrik
dc.contributor.authorPeck, Victoria L.
dc.contributor.authorArmbrecht, Linda
dc.contributor.authorCage, Alix
dc.contributor.authorCardillo, Fabricio G.
dc.contributor.authorDu, Zhiheng
dc.contributor.authorFauth, Gerson
dc.contributor.authorFogwill, Christopher J.
dc.contributor.authoret al.
dc.date.accessioned2022-05-05T09:19:00Z
dc.date.available2022-05-05T09:19:00Z
dc.date.issued2022-04-19
dc.description.abstractThe 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.en_UK
dc.identifier.citationWeber ME, Bailey I, Hemming SR, et al., (2022) Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years, Nature Communications, Volume 13, April 2022, Article number 2044en_UK
dc.identifier.issn2041-1723
dc.identifier.urihttps://doi.org/10.1038/s41467-022-29642-5
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17866
dc.language.isoenen_UK
dc.publisherNatureen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectCryospheric scienceen_UK
dc.subjectPalaeoceanographyen_UK
dc.titleAntiphased dust deposition and productivity in the Antarctic Zone over 1.5 million yearsen_UK
dc.typeArticleen_UK

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