东北地区旱涝的OLR特征分析

该文选取了东北地区4个典型多雨年和4个典型少雨年, 利用OLR资料对该地区旱涝年OLR场的时空分布规律及其低频振荡的传播特征进行了合成对比分析.结果表明, 东北旱涝与低纬OLR的分布及其变化密切相关, 特别是西北太平洋副热带高压、西太平洋ITCZ和印度ITCZ的位置和强度以及赤道中东太平洋OLR的距平在旱涝年均有显著差别, 并且热带和副热带OLR低频振荡的向北传播对东北地区夏季降水也有至关重要的影响.

Characteristics of Outgoing Longwave Radiation Related to Flood and drought over Northeast China

By using the outgoing longwaveradiation(OLR)data and precipitation data,the temporal and spatial distribution featuresof the OLR anomaly patterns corresponding to flood and drought cases over Northeast Chinaare studied.The results show that there is a close correlation between the flood anddrought over Northeast China and the OLR distribution at low latitudes.There areremarkable differences for OLR anomaly patterns in the regions of ITCZ,equatorialEast-Central Pacific and the subtropical high over West Pacific in flood and droughtyears.Furthermore,the northward propagation of low frequency oscillation of OLR overtropical and subtropical areas has great impacts on the summer precipitation overNortheast China.