Analysis on Circulation Characteristic of Precipitation Anomalies in Guizhou Summer

Using the NCEP/NCAR monthly mean meteorological reanalysis data and the monthly precipitation data in China,the anomalous characteristic of summer circulation in more and less rainfall years in Guizhou are studied in this paper.It is found that there are obvious differences of summer circulation between more and less rainfall years.In more rainfall years of Guizhou,South Asian High is weak,West Pacific Subtropic High is stronger than normal year and the ridge axis of it is far southward and westward;Indian summer monsoon and subtropical summer monsoon that affect Guizhou precipitation is more stronger than normal years;the cold air of middle and east routes are strong.In less rainfall years of Guizhou,West Pacific Subtropical High is more stronger than normal years and the ridge axis of it is far northward.In addition,the anomalies of circulation in more rainfall years of Guizhou are usually in opposite.