Advances in Atmospheric Sciences

, Volume 24, Issue 4, pp 606–618 | Cite as

The impacts of moisture transport of East Asian monsoon on summer precipitation in Northeast China

  • Sun Li  (孙 力)
  • Shen Baizhu  (沈柏竹)
  • Gao Zongting  (高枞亭)
  • Sui Bo  (隋 波)
  • Lesheng Bai
  • Sheng-Hung Wang
  • An Gang  (安 刚)
  • Li Jian  (李 健)
Article
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Revised:

Abstract

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.

Key words

Northeast China East Asian monsoon moisture transport source-sink structure air mass trajectory 
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Copyright information

© Science Press 2007

Authors and Affiliations

  • Sun Li  (孙 力)
    • 1
    • 2
  • Shen Baizhu  (沈柏竹)
    • 1
    • 2
  • Gao Zongting  (高枞亭)
    • 1
    • 2
  • Sui Bo  (隋 波)
    • 1
  • Lesheng Bai
    • 3
  • Sheng-Hung Wang
    • 2
  • An Gang  (安 刚)
    • 1
  • Li Jian  (李 健)
    • 1
  1. 1.Institute of Meteorological Sciences of Jilin ProvinceChangchunChina
  2. 2.Wuhan Institute of Heavy RainWuhanChina
  3. 3.Polar Meteorology Group, Byrd Polar Research CenterThe Ohio State UniversityColumbusUSA

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