摘要
利用高原4个区域的平均降水资料,分析了高原夏季降水的变化特征,同时利用雪盖和100hPa高度场资料,讨论了高原降水和欧亚雪盖的相关关系,并利用雪盖和高度场的相关关系解释了产生高原降水变化的遥相关机制。研究指出:高原降水存在着东多西少、南多北少的分布特征,降水变化存在着准3年的振荡周期;高原降水受同期欧亚雪盖的影响较大,与欧亚雪盖相关的高度场准定常行星波列是高原夏季降水的一种物理机制。
By using the precipitation data in four areas of the Qinghai-Xizang Plateau,the variation of summer precipitation over the plateau is discussed and by using the dataof the Eurasian snow cover and the100 hPa height field, the correlation between theplateau precipitation and the Eurasian snow cover, with which the teleconnection mecha-nism causing the variation of the plateau precipitation is explained. Analysis shows thatmore preciptation is experienced in the east and south than in the west and north of theplateau, The precipitation has quasi-three-yesr oscillation and is influenced enormous-ly by the Eurasian snow cover occurring simultaneously. The quasi-stationary plane-tary wavetrain correlated with the Eurasian snow cover is a physical mechanism of thesummer precipitation over the plateau.
出处
《南京气象学院学报》
CSCD
1992年第4期517-524,共8页
Journal of Nanjing Institute of Meteorology
