CHARACTERISTICS OF OUTGOING LONGWAVE RADIATION RELATED TO FLOOD AND DROUGHT OVER NORTHEAST CHINA

By using the outgoing longwave radiation (OLR) data and precipitation data, the temporal and spatial distribution features of the OLR anomaly patterns corresponding to flood and drought cases over Northeast China are studied. The results show that there is a close correlation between the flood and drought over Northeast China and the OLR distribution at low latitudes. There are remarkable differences for OLR anomaly patterns in the regions of ITCZ, equatorial East-Central Pacific and the subtropical high over West Pacific in flood and drought years. Furthermore, the northward propagation of low frequency oscillation of OLR over tropical and subtropical areas has great impacts on the summer precipitation over Northeast China.