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Published on: October 25, 2019
Volcanic eruptions caused weakening AMOC during the preindustrial past millennium
Kefan Chen1,2, Zhengyu Liu3, Liang Ning4,5
1State Key Laboratory of Climate System Prediction and Risk Management; Key Laboratory for Virtual Geographic Environment of Ministry of Education; State Key Laboratory Cultivation Base of Geographical Environment Evolution and Regional Response of Jiangsu Province; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application; School of Geography, Nanjing Normal University, Nanjing, China.
None:
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of our climate system. However, the evolution history and the forcing mechanism of AMOC in the last millennial has remained uncertain. Here, combining available paleo AMOC-sensitive indicators with multiple climate models and paleo Data Assimilation, we show, for the first time, that the AMOC transport exhibits a slow declining trend into the Little Ice Age, with a reduction of about (~4%) from AD 850-1850. This weakening is mainly caused by explosive volcanic eruptions. After a rapid strengthening in the initial decade following a volcanic eruption, the AMOC tends to show a slow weakening of centennial timescale, driven by stored cooling in the deep Atlantic and its feedback on North Atlantic climate.
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