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The Impacts of Moisture Transport of East Asian Monsoon on Summer Precipitation in Northeast China

Advances in Atmospheric Sciences 2007年第4期24卷 606-618页

作者：孙力沈柏竹高枞亭隋波 Lesheng BAI Sheng-Hung WANG 安刚李健 Institute of Meteorological Sciences of Jilin Province Changchun 130062 Wuhan Institute of Heavy Rain Wuhan 430074 Polar Meteorology Group Byrd Polar Research Center The Ohio State University Columbus Ohio 43210 USA

By using the ECMWF reanalysis daily data and daily precipitation data of 80 stations in Northeast China from 1961 to 2002, the impacts of moisture transport of East Asian summer monsoon on the summer precipitation anomaly in Northeast China, and the relationship between the variation of moisture budget and the establishment of East Asian summer monsoon in this region are studied. The results demonstrate that the moisture of summer precipitation in Northeast China mainly originates from subtropical, South China Sea, and South Asia monsoon areas. East China and its near coastal area are the convergent region of the monsoonal moisture currents and the transfer station for the currents continually moving northward. The monsoonal moisture transport, as an important link or bridge, connects the interaction between middle and low latitude systems. In summer half year, there is a moisture sink in Northeast China where the moisture influx is greater than outflux. The advance transport and accumulation of moisture are of special importance to pentad time scale summer precipitation. The onset, retreat, and intensity change of the monsoonal rainy season over Northeast China are mainly signified by the moisture input condition along the southern border of this area. The establishment of East Asian summer monsoon in this area ranges from about 10 July to 20 August and the onset in the west is earlier than that in the east. The latitude that the monsoon can reach is gradually northward from west to east, reaching 50°N within longitude 120°-135°E. In summer, the difference of air mass transport between summers with high and low rainfall mainly lies in whether more air masses originating from lower latitudes move northward through East China and its coastal areas, consequently transporting large amounts of hot and humid air into Northeast China.

关键词： Northeast China East Asian monsoon moisture transport source-sink structure air mass trajectory

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