Productivity- and ocean circulation changes in the sub-Antarctic Atlantic during the last deglaciation and Marine Isotope Stage 3
Cobertura |
LATITUDE: -44.153330 * LONGITUDE: -14.228170 |
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Data(s) |
08/04/2015
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Resumo |
Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a 'control valve' on ocean-atmosphere CO2 exchange has been emphasized, the exact nature of this role, in particular the relative contributions of physical (for example, ocean dynamics and air-sea gas exchange) versus biological processes (for example, export productivity), remains poorly constrained. Here we combine reconstructions of bottom-water [O2], export production and 14C ventilation ages in the sub-Antarctic Atlantic, and show that atmospheric CO2 pulses during the last glacial- and deglacial periods were consistently accompanied by decreases in the biological export of carbon and increases in deep-ocean ventilation via southern-sourced water masses. These findings demonstrate how the Southern Ocean's 'organic carbon pump' has exerted a tight control on atmospheric CO2, and thus global climate, specifically via a synergy of both physical and biological processes. |
Formato |
application/zip, 3 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.845078 doi:10.1594/PANGAEA.845078 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Gottschalk, Julia; Skinner, Luke C; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel L; Waelbroeck, Claire (2016): Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature Communications, 7(11539), doi:10.1038/ncomms11539 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Department of Earth Sciences, University of Cambridge |
Palavras-Chave | #Acc rate opal; Accumulation rate, opal; after Hoogakker et al. (2014); Age; AGE; authigenic coatings; authigenic coatings, mean; bSiO2; C. kullenbergi d13C; C. kullenbergi - G. affinis; calcitic shell+authigenic coatings; calcitic shell+authigenic coatings, mean; Cibicides kullenbergi, d13C; Dd13C; Delta delta 13C; Depth; DEPTH, sediment/rock; Fourier transform infrared spectroscopy (FTIR); Fourier transform infrared spectroscopy (FTIR), 230Thorium normalization; G. affinis d13C; G. bulloides Mn/Ca; G. bulloides U/Ca; G. bulloides U/Mn; Globigerina bulloides, Manganese/Calcium ratio; Globigerina bulloides, Uranium/Calcium ratio; Globigerina bulloides, Uranium/Manganese ratio; Globobulimina affinis, d13C; interpolated; Opal, biogenic silica; Oxygen; OXYGEN; U/Ca; U/Mn; Uranium/Calcium ratio; Uranium/Manganese ratio; Uvigerina spp., Manganese/Calcium ratio; Uvigerina spp., Uranium/Calcium ratio; Uvigerina spp., Uranium/Manganese ratio; Uvigerina spp. Mn/Ca; Uvigerina spp. U/Ca; Uvigerina spp. U/Mn; wt% |
Tipo |
Dataset |