Intensity Variation of Plateau Summer Monsoon and Its Relation with Summer Temperature and Precipitation in Eastern Part of Southwest China in 2006

Based on the daily precipitation and temperature data at 37 meteorological stations in eastern southwest China and NCEP /NCAR R2 reanalysis data in 2006,the variation characteristics of the plateau summer monsoon and its relation with summer climate in eastern southwest China were analyzed and discussed by the correlation analysis and composite analysis. The results showed that the variations of plateau summer monsoon had close connection with summer climate in eastern southwest China in 2006. The variations of plateau summer monsoon intensity were closely related with persistent anomalies of atmospheric circulation in the same period,such as the South Asia High( SAH),atmospheric circulation anomalies in the mid- high latitude,Western Pacific Subtropical High( WPSH),westerly belt circulation,lower- level flow field,vertical movement and so on,and then affected climate change in eastern southwest China in summer of 2006. Furthermore,the correlation between the seasonal change of plateau summer monsoon and the atmospheric heat source over Tibetan plateau in summer of 2006 was obviously positive. The thermal effects of atmosphere over Tibetan Plateau played an important role in anomalous variation of the plateau summer monsoon.