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On Shanxi Summer Interannual Climate Change Ⅰ.Concurrent Rich/Seldom Rainfall Pattern

Li Zhicai1 Song Yan2 Zhu Linhong1 Zhang Shiying1(1.Shanxi Meteorological Bureau,Taiyuan 030002;2.Training Centre,CMA)  
Using American National Centre of Environmental Prediction reanalysis data and monthly precipitation data at 64 observational stations of Shanxi Province,the precipitation and temperature anomalies variation and temporal/spatial distribution patterns in 1960-2003 summer was studied with EOF,wavelet analyses and composite analyses methods.The first rainfall pattern over Shanxi Province was concurrent rich/seldom rain pattern.The distinctive years were selected and the corresponding spatial distributions were made out.Summer precipitation trends appeared the same trend pattern with the first rainfall pattern and showed that precipitation in 43 years decreased mainly over whole Shanxi Province.With the first rainfall pattern,analyzed were the general circulation anomalies and meridional winds on 500hPa potential height field,850hPa wind vector anomalous fields,700hPa water vapor field and sea surface temperature anomalies and so on.The results showed that concurrent rich rainfall pattern in Shanxi Province corresponded to strong East Asian summer monsoon,normally appeared at the year when La Nina event was happening and El Nino event had happened during last winter.While at mid-and high-latitudes there was latitudinal+-+-anomalous circulation pattern,and over Asian continent there were one trough around Baikal and two ridges around Ural Mountain and Okhotsk Sea respectively.Concurrent poor rainfall pattern corresponded to weak East Asian summer monsoon,normally appeared at the year when El Nino event was happening and La Nina event had happened during last winter.At the same time,at mid-and high-latitudes there was latitudinal-+-+anomalous circulation pattern,and over Asian continent there were two troughs and one ridge.Therefore,The first rainfall pattern in Shanxi Province is strong related to the anomalous latitudinal wave train happened at mid-and high-latitudes and SSTA over the equatorial Pacific Ocean.
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