Abstract: Based on monthly gauged rainfall data in Northeast China and the global atmospheric and oceanic reanalysis dataset for 1961-2015, the decadal changes of rainfall in May over Northeast China (NEC) as well as its relationship with atmospheric circulation and sea surface temperature were investigated using statistical and diagnostic methods. Different from that in late-summer, the rainfall in May over NEC depicted negative anomalies during 1984-1993 and positive anomalies during the early 21st century. The decadal changes of rainfall in May over NEC is mainly attributed to the decadal variation of Northern East Asian low (NEAL) in May. During the early 21st century, the NEAL was much stronger than its climatology, resulting in surplus rainfall over NEC. Nevertheless, the NEAL was weakened into a shallow trough during 1984-1993, leading to deficient rainfall over NEC. A wave train in the geopotential height field over the Eurasia causes significant vertical motion over the Northern East Asia, which contributes to the above variation of the NEAL. The sea surface temperature anomalies over the tropical North Atlantic in May is the possible external forcing generating the above wave train, which gives rise to the corresponding decadal changes of rainfall over NEC.
郭恒 肖子牛. 东北5月降水在21世纪初的年代际变化及可能成因[J]. 气候变化研究进展, .
GUO Heng, XIAO Zi-Niu. Decadal variation of rainfall in May over Northeast China since the early 21s century and possible causes. Climate Change Research, 0, (): 0-0.