Millennial and centennial CO2 release from the Southern Ocean during the last deglaciation
Type | Article | ||||||||||||||||||||
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Date | 2022-04 | ||||||||||||||||||||
Language | English | ||||||||||||||||||||
Author(s) | Yu Jimin1, 2, Oppo Delia W.3, Jin Zhangdong4, Lacerra Matthew5, Ji Xuan2, Umling Natalie E.6, Lund David C.7, McCave Nick8, Menviel Laurie9, Shao Jun10, Xu Chen2 | ||||||||||||||||||||
Affiliation(s) | 1 : Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China 2 : Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Terriroty, Australia 3 : Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, USA 4 : SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China 5 : Department of Geosciences, Princeton University, Princeton, NJ, USA 6 : Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY, USA 7 : Department of Marine Sciences, University of Connecticut, Groton, CT, USA 8 : Department of Earth Sciences, University of Cambridge, Cambridge, UK 9 : Climate Change Research Centre, Earth and Sustainability Science Research Centre, University of New South Wales, Sydney, New South Wales, Australia 10 : Department of Earth Science, University of Southern California, Los Angeles, CA, USA |
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Source | Nature Geoscience (1752-0894) (Springer Science and Business Media LLC), 2022-04 , Vol. 15 , N. 4 , P. 293-299 | ||||||||||||||||||||
DOI | 10.1038/s41561-022-00910-9 | ||||||||||||||||||||
WOS© Times Cited | 8 | ||||||||||||||||||||
Abstract | For its greenhouse effects, atmospheric CO2 can critically influence the global climate on millennial and centennial timescales. Pleistocene atmospheric CO2 variations must involve changes in ocean storage of carbon, but the mechanisms and pathways of carbon transfer between the oceanic and atmospheric reservoirs are poorly understood due, in part, to complications associated with interpretation of carbonate system proxy data. Here we employ a recently developed approach to reconstruct upper Atlantic air–sea CO2 exchange signatures through the last deglaciation. Using this approach, proxy and model data each suggest that there was a net release of CO2 via the Atlantic sector of the Southern Ocean during the early deglaciation, which probably contributed to the millennial-scale atmospheric CO2 rise during Heinrich Stadial 1 at ~18.0–14.7 kyr ago. Moreover, our data reveal a previously unrecognized mechanism for the centennial-scale atmospheric CO2 rise at the onset of the Bølling warming event around 14.7 kyr ago, namely, the expansion of Antarctic Intermediate Water, a water mass that is especially inefficient at sequestering atmospheric CO2. Our findings highlight the role of the Southern Ocean outgassing and intermediate water-mass production and volume variations in governing millennial- and centennial-timescale atmospheric CO2 rises during the last deglaciation. |
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