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On Shanxi Summer Inter-annual Climate Anomalies:2.Seldom/Rich Rainfall in North/South and Rich/Seldom Rainfall in North/South Pattern

Song Yan1 Li Zhicai2 Zhu Linhong2 Zhang Shiying2(1.Training Centre of China Meteorological Administration,Beijing 100081; 2.Shanxi Meteorological Bureau)  
Using American National Centre of Environmental Prediction reanalysis data and monthly precipitation data at 64 observational stations of Shanxi Province,the summer rainfall an-omalies in1960-2003,that is the second rainfall pattern of rich/seldom in the north and seldom/rich in the south,and temperature anomalies variation were analyzed with EOF,wavelet analysis and composite analysis methods.The temperature linear trend indicated that warmer in the north and cooler in the south was well accordance to the seldom rainfall in the north and rich in the south from 1960 to 2003.The distinctive years of the second rainfall pattern were selected and the corresponding spatial and temporal distributions were made.The analysis was performed for the general circulation anomalies features with 500hPa potential height field,zonal winds,850hPa wind vector anomalous fields,700hPa water vapor field and water vapor transportation field.The results showed that the second rainfall pattern was closely related to weak East Asian summer monsoon and rich in the north or in the south were different appearances of weak monsoon.When the rich/poor rainfall in the north and poor/rich rainfall in the south pattern happened,the subtropical high was stronger/weaker and presented belt/block pattern,and there was westerly/easterly anomalies in north/south,which meant that the northern front region was located more north.And the water vapor transport from the southwest to the northeast was stronger/weaker too.When rainfall was rich in the north and seldom in the south,there was a wave train appearing big circle route at mid-and high-latitudes,while at high latitude the latitudinal wave train appeared-+-anomalous circulation pattern and along the coast of East Asian continent-+-anomalous circulation pattern too.Analysis of sea surface temperature showed that the second rainfall pattern has strong connection with Pacific SSTA at middle and high latitudes.
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