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diversity on the Interannual Variations of Spring monthly Precipitation in Southern China and the Associated Tropical Sea Surface Temperature Anomalies

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热带气象学报:英文版 2023年第3期29卷 337-346页

作者：郭如月潘蔚娟柯敏玲魏维王子谦 School of Atmospheric Sciences Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiGuangdong 519082 China Guangzhou Climate and Agrometeorology Center Guangzhou Meteorological ServiceGuangzhou 511400 China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityZhuhaiGuangdong 519082 China

There is a continuous and relatively stable rainy period every spring in southern China(SC).This spring precipitation process is a unique weather and climate phenomenon in East ***,the variation characteristics and associated mechanisms of this precipitation process have been mostly discussed from the perspective of seasonal *** on the observed and reanalysis datasets from 1982 to 2021,this study investigates the diversity of the interannual variations of monthly precipitation in spring in SC,and focuses on the potential influence of the tropical sea surface temperature(SST)*** results show that the interannual variations of monthly precipitation in spring in SC have significant differences,and the correlations between each two months are very *** the interannual variations of precipitation in three months are related to a similar western North Pacific anomalous anticyclone(WNPAC),and the southwesterlies at the western flank of WNPAC bring abundant water vapor for the precipitation in ***,the WNPAC is influenced by tropical SST anomalies in different regions each *** interannual variation of precipitation in March in SC is mainly influenced by the signal of El Nino-Southern Oscillation,and the associated SST anomalies in the equatorial central-eastern Pacific regulate the WNPAC through the Pacific-East Asia(PEA)*** contrast,the WNPAC associated with the interannual variation of precipitation in April can be affected by the SST anomalies in the northwestern equatorial Pacific through a thermally induced Rossby wave *** interannual variation of precipitation in May is regulated by the SST anomalies around the western Maritime Continent,which stimulates the development of low-level anomalous anticyclones over the South China Sea and east of the Philippine Sea by driving anomalous meridional vertical circulation.

关键词： spring precipitation monthly diversity interannual variation southern China tropical sea surface temperature

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