OLR Distribution in Summer in Dryness/wetness Years over Tibetan Plateau

Based on the OLR data observed by NOAA satellite, the climatic features of the radiation over the Tibetan Plateau and adjacent areas are investigated. The main results are as follows: the Plateau acts as the heat sink of the surface heating fields in winter and OLR is low; the Plateau rainfall mainly concentrates in summer and OLR is also low. There exists significant negative correlation between OLR over the Plateau and Plateau precipitation in summer; The change of OLR during the onset of Indian Monsoon reflects the adjustment of the Northern Hemisphere general circulation as well as the spatial and temporal pattern of thermal conditions over the Plateau during wet season. Composite India Ocean OLR anomalies patterns for five wet (dry) years over the Tibetan plateau in summer are studied. It is found that convection on the west and east of the Indian Ocean is abnormal obviously. Correlation analysis shows that OLR over the Bay of Bengal during spring has better negative relationship with rain over the Plateau in summer.