A Study on Water Vapor Transport and Budget of Heavy Rain in Northeast China |
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| Authors: | SUN Li SHEN Baizhu and SUI Bo |
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| Institution: | Institute of Meteorological Sciences of Jilin Province, Changchun 130062,Wuhan Institute of Heavy Rain, Wuhan 430074, Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon, Changchun 130062,Institute of Meteorological Sciences of Jilin Province, Changchun 130062, Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon, Changchun 130062,Institute of Meteorological Sciences of Jilin Province, Changchun 130062, Laboratory of Research for Middle-High Latitude Circulation Systemsand East Asian Monsoon, Changchun 130062 |
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| Abstract: | The characteristics of moisture transport and budget of widespread heavy
rain and local heavy rain events in Northeast China are studied using the
NCEP--NCAR reanalysis 6-hourly and daily data and daily precipitation data
of 200 stations in Northeast China from 1961--2005. The results demonstrate
that during periods with widespread heavy rain in Northeast China, the Asian
monsoon is very active and the monsoonal northward moisture transport is
strengthened significantly. The widespread heavy rainfall obtains enhanced
water vapor supply from large regions where the water vapor mainly
originates from the Asian monsoon areas, which include the East Asian
subtropical monsoon area, the South China Sea, and the southeast
and southwest tropical monsoon regions. There are several branches of
monsoonal moisture current converging on East China and its coastal areas,
where they are strengthened and then continue northward into Northeast
China. Thus, the enhanced northward monsoonal moisture transport is the key
to the widespread heavy rain in Northeast China. In contrast, local heavy
rainfall in Northeast China derives water vapor from limited areas,
transported by the westerlies. Local evaporation also plays an important
role in the water vapor supply and local recycling process of moisture. In
short, the widespread heavy rains of Northeast China are mainly caused by
water vapor advection brought by the Asian monsoon, whereas local heavy
rainfall is mainly caused by the convergence of the westerly wind field. |
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| Keywords: | heavy rain Northeast China moisture transport moisture budget Asian monsoon |
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