期刊
QUATERNARY SCIENCE REVIEWS
卷 230, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2019.106067
关键词
Glacials; Palaeoclimatology; Southern Ocean; Redox-sensitive elements; Carbon cycle; Foraminifera; Dansgaard-Oeschger cycles; Atmospheric CO2 variations; Stadials; Interstadials
资金
- Gates Cambridge Trust
- German Research Foundation [GO 2294/2-1]
- Royal Society
- NERC [NE/J010545/1]
- Cambridge Newton Trust
- Swiss National Science Foundation [PP00P2_144811, 200021_163003]
- Australian Research Council [DE150100107, FT180100606]
- European Research Concil [339108]
- Swiss National Science Foundation (SNF) [200021_163003] Funding Source: Swiss National Science Foundation (SNF)
- NERC [NE/J010545/1] Funding Source: UKRI
- European Research Council (ERC) [339108] Funding Source: European Research Council (ERC)
Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. Yet, there remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to abrupt climate variability in the northern hemisphere associated with perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the spatial extent of the AMOC and its sensitivity to perturbations. This provides an opportunity to compare the nature of marine carbon cycle-climate feedbacks between them. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC geometry (via carbonate ion saturation) in the deep South Atlantic. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pattern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels. We find that net ocean carbon loss, and hence the magnitude of CO2,atm rise, is largely determined by the stadial duration. North Atlantic climate anomalies therefore affect Southern Ocean carbon cycling in a consistent manner, through oceanic (e.g., ventilation seesaw) and/or atmospheric processes (e.g., Ekman pumping). (C) 2019 Elsevier Ltd. All rights reserved.
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