摘要
利用１９７４—１９９０年青藏高原地区地－气系统月平均射出长波辐射（ＯＬＲ）资料，采用ＥＯＦ方法分析了前３个特征向量场，得到了青藏高原地区地－气系统射出长波辐射的几种异常形式，阐述了它们的天气气候特征，并对不同气候区的持续性及其与北半球大气环流的关系作了研究。结果表明：青藏高原ＯＬＲ的异常分布可导致北半球５００ｈＰａ月平均环流的异常，同期表现为沿大圆路径传播的Ｒｏｓｓｂｙ准定常波波列；冬季高原ＯＬＲ还具有较好的持续性，可引起滞后１—２个月的环流异常。
Based on the NOAA's monthly mean gridded OLR datd over the Qinghai-Xizang Plateau from 1974 to 1990,the first three characteristic vectores and their distribution feature of time and space anomaly have been analysed by EOF method.The climatic feature of OLR and the persistence in different climatic regiones and the relationship between OLR and general circulation over Northern Hemisphere were studied.It is shown that the anomaly of OLR can cause the anomaly of 500hPa monthly mean general circulation over Northern Hemisphere.A Rossby quasi-permanent wave train propagates along large circle route in the same time.There is a good persistence of OLR over the Qinghai-Xizang Plateau in winter and it can cause the anomaly of general circulation with one or two months lag.There are only northeast and northweest wave trains over the Qinghai-Xizang Plateau in summer.
出处
《高原气象》
CSCD
北大核心
1996年第3期259-268,共10页
Plateau Meteorology
关键词
青藏高原
大气环流
气候特征
北半球
The Qinghai-Xizang Plateau Outgoing longwave radiation General circulation anomaly Empirical orthogonal function
