ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics and Trends of Rainfall Events in Northeast China from May to September During 1956-2008
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Abstract:
The daily stational rainfall and temperature dataset from National Meteorological Information Center of China Meteorological Administration as well as the NCEP/NCAR monthly reanalysis data are used to analyze the characteristics and trends of climate rainfall events in Northeast China for the period 1956-2008. The center of precipitation is located in the windward direction of Changbai Mountains. The large and heavy rain events also happen in the same area frequently. This is in association with the terrain and the push of the northward flow of the East Asia summer monsoon. Secondly, the trace rain events are observed as morelessmore in the zonal direction, and the other rainfall events occur more in east than that of west. In the meridianal direction, more trace, light and small rainfall events occur in north whereas fewer large and heavy rain events in north. Thirdly, the decreasing of water vapor transport crossing the west and south boundary causes the decreasing of seasonal rainfall during May to September in Northeast China. Finally, the decreasing trends of trace, light and small rainfall events are significant. As the increasing of rainfall grades, the decreasing trends get less obviously. Decreasingincreasingdecreasing trends of heavy rain events are evidently shown in the periods 1956-1976, 1976-1994 and 1994-2008 respectively.
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