North Atlantic forcing of autumn drought in Southwest China |
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| Authors: | Chaoxia Yuan Wei Zhang Yahan Zhong Xinyu Lu Jingchan Liu Md Wahiduzzaman |
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| Affiliation: | Key Laboratory of Meteorological Disaster of Ministry of Education,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Institute 6or Climate and Application Research (ICAR),Nanjing University of Information Science and Technology,Nanjing,China,Yunnan Institute of Meteorological Sciences,Kunming,China |
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| Abstract: | Drought often lasts long and is thus closely related to slowly varying external forcing such as sea surface temperature(SST).Here,based on observed precipitation and SST data along with NCEP-DOE reanalysis data,the possible impacts of North Atlantic SST on drought formation in Southwest China are investigated.Results show that northeast-southwest-orientated dipole SST anomalies in the mid-high latitudes of the North Atlantic are closely related to autumn drought in Southwest China;the linear correlation coefficient between them reaches 0.48 during 1979-2020,significant at the 0.001 level.The dipole SST anomalies trigger southeastward-propagating Rossby waves and induce barotropic cyclonic circulation anomalies over India and the western Tibetan Plateau.This enhances the upward motion in northern India and the western Tibetan Plateau and causes a compensating downdraft,reduced precipitation,and consequent drought formation in Southwest China. |
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| Keywords: | Autumn drought Southwest China North Atlantic SST Teleconnection |
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