Penultimate deglaciation Asian monsoon response to North Atlantic circulation collapse ...

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 chang...

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Bibliographic Details
Main Authors: Wassenburg, Jasper A., 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.
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2021
Subjects:
North Atlantic
Online Access:https://dx.doi.org/10.3929/ethz-b-000519155
http://hdl.handle.net/20.500.11850/519155
Description
Summary: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 ... : Nature Geoscience, 14 (12) ...

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