Penultimate deglaciation Asian monsoon response to North Atlantic circulation collapse
Penultimate deglaciation Asian monsoon response to North Atlantic circulation collapse
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倒数第二次冰川消融亚洲季风对北大西洋环流崩溃的响应
DOI：
10.1038/s41561-021-00851-9
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发表时间：
2021-11
影响因子：
18.3
通讯作者：
J. Wassenburg;H. Vonhof;Hai Cheng;A. Martínez-García;Pia-Rebecca Ebner;Xianglei Li;Haiwei Zhang;Lijuan Sha;Ye Tian;R. Edwards;J. Fiebig;G. Haug
中科院分区：
文献类型：
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作者：
J. Wassenburg;H. Vonhof;Hai Cheng;A. Martínez-García;Pia-Rebecca Ebner;Xianglei Li;Haiwei Zhang;Lijuan Sha;Ye Tian;R. Edwards;J. Fiebig;G. Haug
在冰川终止期间，北大西洋的大量冰山排放和融水脉冲引发了大西洋经向翻转环流（AMOC）的关闭。洞穴沉积物碳酸钙氧同位素（δ18OCc）记录表明，AMOC的崩溃导致了东亚和印度季风降水分布和变率的剧烈变化。然而，亚洲季风δ 18OC与AMOC强度变化之间的联系机制尚未完全清楚。洞穴沉积物的δ 18OC不仅取决于降水的δ18O，而且还取决于温度和动力学同位素效应。在这里，我们定量反褶积这些参数影响δ 18OC应用三种地球化学技术在洞穴覆盖倒数第二次冰期终止。我们的数据表明，在融水脉冲2A期间AMOC的减弱导致东亚大幅降温，夏季风季节缩短，而在融水脉冲2B期间AMOC的崩溃（133，000年前）也导致印度夏季风强度急剧下降。这些结果表明，不同模态的AMOC对季风系统产生了不同的影响。
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 δ18OCcare not fully understood. Part of the challenge arises from the fact that speleothem δ18OCcdepends on not only the δ18O of precipitation but also temperature and kinetic isotope effects. Here we quantitatively deconvolve these parameters affecting δ18OCcby 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.