青藏高原OLR场的季节变化特征  

CHARACTERISTICS OF THE SEASONAL VARIATION IN OLR FIELD OVER THE TIBETAN PLATEAU

作　　者：杨喜峰 蒋尚城[1] 

机构地区：[1]北京第二炮兵气象中心,北京大学地球物理系

出　　处：《应用气象学报》1995年第4期414-421,共8页Journal of Applied Meteorological Science

基　　金：高等学校博士学科点基金

摘　　要：该文利用１９７９～１９９１年卫星观测的ＯＬＲ逐候资料，分析青藏高原ＯＬＲ场的季节变化特征，结果表明：青藏高原ＯＬＲ场具有显著的季节变化特点，在冬、夏两季高原ＯＬＲ场表现为“缓变”态，在春、秋两过渡季节表现为“急变”态，同时发现，在春季高原西南部出现持续强的ＯＬＲ候际正变化区，表明高原加热场在春季的持续加强。各年高原ＯＬＲ场的季节变化有很大差异，在高原夏季来得早且季节过渡快的年份，相应印度地区的季风雨偏多；在高原夏季来得晚或正常时，印度地区的季风雨偏少或正常。By using 13-year pentad mean Outgoing Longwave Radiation(OLR)data(1979～1991)observed by NOAA satellites, the characteristics of the seasonal variation in OLRfield over the Tibetan Plateau are investigated. The results show that the OLR field hasoutstanding seasonal variation. The major feature is that the OLR field is ″moderatevariation condition″in winter and summer, and″abrupt variation condition″during thetransition seasons of spring and autumn。 There is persistent and strong positiveinterpentad change of OLR over the southwest of Tibetan Plateau in spring. It meansthat the enhanced heating field over the Plateau in spring has probahly important effecton the seasonal transition of the regional climate. Additionally,the interannualvariabilitv of the seasonal transition of the OLR field over the Tibetan Plateau is alsoclear. It is closely related to the anornalies of the monsoon precipitation,that thesummer over the Plateau comes early or late.

关 键 词：青藏高原 季节变化 射出长波辐射 

分 类 号：P462.4[天文地球—大气科学及气象学]