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Título: | Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years |
Autor: | Weber, M.E.; Bailey, I.; Hemming, S.R.; Martos, Y.M.; Reilly, B.T.; Ronge, T.A.; Brachfeld, S.; Williams, T.; Raymo, M.; Belt, M.; Smik, L.; vogel, H.; Peck, V.; Armbrecht, L.; Cage, A.; Cardillo, F.G.; Du, Z.; Fauth, G.; Fogwill, C.J.; García-García, Margarita; et al. | Palabras clave: | Centro Oceanográfico de Cádiz Medio Marino |
Fecha de publicación: | 19-abr-2022 | Citación: | Nature Communications, 13. 2022: 2044-2060 | Resumen: | 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. | Versión del editor: | https://www.nature.com/articles/s41467-022-29642-5 | URI: | http://hdl.handle.net/10261/318728 | DOI: | 10.1038/s41467-022-29642-5 |
Aparece en las colecciones: | (IACT) Artículos (IEO) Artículos |
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2022_Weber_et_al_2022_Nat_Com_Antiphased.pdf | Articulo | 6,7 MB | Adobe PDF | Visualizar/Abrir |
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