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Penultimate deglaciation Asian monsoon response to North Atlantic circulation collapse

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Title
Penultimate deglaciation Asian monsoon response to North Atlantic circulation collapse
Author(s)
Jasper A. Wassenburg; Vonhof, Hubert B.; Cheng, Hai; Martínez-García, Alfredo; Ebner, Pia-Rebecca; Li, Xianglei; Zhang, Haiwei; Sha, Lijuan; Tian, Ye; Edwards, R. Lawrence; Fiebig, Jens; Haug, Gerald H.
Publication Date
2021-12
Journal
Nature Geoscience, v.14, no.12, pp.937 - 941
Publisher
Nature Research
Abstract
© 2021, The Author(s).During glacial terminations, massive iceberg discharges and meltwater pulses in the North Atlantic triggered a shutdown of the Atlantic Meridional Overturning Circulation (AMOC). Speleothem calcium carbonate oxygen isotope records (δ18OCc) indicate that the collapse of the AMOC caused dramatic changes in the distribution and variability of the East Asian and Indian monsoon rainfall. However, the mechanisms linking changes in the intensity of the AMOC and Asian monsoon δ18OCc are not fully understood. Part of the challenge arises from the fact that speleothem δ18OCc depends on not only the δ18O of precipitation but also temperature and kinetic isotope effects. Here we quantitatively deconvolve these parameters affecting δ18OCc by applying three geochemical techniques in speleothems covering the penultimate glacial termination. Our data suggest that the weakening of the AMOC during meltwater pulse 2A caused substantial cooling in East Asia and a shortening of the summer monsoon season, whereas the collapse of the AMOC during meltwater pulse 2B (133,000 years ago) also caused a dramatic decrease in the intensity of the Indian summer monsoon. These results reveal that the different modes of the AMOC produced distinct impacts on the monsoon system.
URI
https://pr.ibs.re.kr/handle/8788114/10998
DOI
10.1038/s41561-021-00851-9
ISSN
1752-0894
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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