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The Response of anomalous Vertically Integrated moisture Flux patterns Related to Drought and Flood in Southern China to Sea Surface Temperature Anomaly

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Journal of Tropical Meteorology 2023年第2期29卷 179-190页

作者：董娜徐祥德蔡雯悦王春竹赵润泽魏凤英孙婵 Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438 China State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijing 100081 China Training Center China Meteorological AdministrationBeijing 100081 China National Satellite Meteorological Center Beijing 100081 China

With the extreme drought(flood)event in southern China from July to August in 2022(1999)as the research object,based on the comprehensive diagnosis and composite analysis on the anomalous drought and flood years from July to August in 1961-2022,it is found that there are significant differences in the characteristics of the vertically integrated moisture flux(VIMF)anomaly circulation pattern and the VIMF convergence(VIMFC)anomaly in southern China in drought and flood years,and the VIMFC,a physical quantity,can be regarded as an indicative physical factor for the"strong signal"of drought and flood in southern ***,in drought years,the VIMF anomaly in southern China is an anticyclonic circulation pattern and the divergence characteristics of the VIMFC are prominent,while those are opposite in flood *** on the SST anomaly in the typical draught year of 2022 in southern China and the SST deviation distribution characteristics of abnormal draught and flood years from 1961 to 2022,five SST high impact areas(i.e.,the North Pacific Ocean,Northwest Pacific Ocean,Southwest Pacific Ocean,Indian Ocean,and East Pacific Ocean)are selected via the correlation analysis of VIMFC and the global SST in the preceding months(May and June)and in the study period(July and August)in 1961-2022,and their contributions to drought and flood in southern China are *** study reveals not only the persistent anomalous variation of SST in the Pacific and the Indian Ocean but also its impact on the pattern of moisture ***,it can be discovered from the positive and negative phase fitting of SST that the SST composite flow field in high impact areas can exhibit two types of anomalous moisture transport structures that are opposite to each other,namely an anticyclonic(cyclonic)circulation pattern anomaly in southern China and the coastal areas of east *** two types of opposite anomalous moisture transport structures can not only drive the forma

关键词： drought in southern China in 2022 VIMFC anomaly high impact areas of SST anomaly anomalous moisture transport circulation pattern typical drought and flood years

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