【摘要】 使用NCEP/NCAR 1 958～ 1 997年 40年再分析全球月平均网格点资料以及青藏高原东北侧地区同期 1 7个站降水量观测资料 ,选取了初夏最干旱的 3个年份 (1 962 ,1 995 ,1 997年 )和最湿润的 3个年份 (1 967,1 984,1 985年 ) ,分析计算了初夏典型干湿年东亚范围内 50 0hPa平均位势高度场、风矢场、涡度场和散度场 ,指出青藏高原东北侧初夏干旱和多雨与中高纬环流特征有关 ,表现在物理量场上有显著差异。更多还原

【Abstract】 The NCEP/NCAR global monthly reanalysis data and the observed precipitation data at 17 stations in the northeastern part of Qinghai Xizang Plateau about 40 years(1958～1997) are used in this paper. Based on the selected three severe drought years(1962, 1995, 1997) and three rainy years (1967, 1984, 1985)in early summer, the 500 hPa potential height fields, u, v vector fields, vorticity fields and the divergence fields over East Asia in early summer are analyzed respectively. The results show that the drought and rainy years in the northeastern part of Qinghai Xizang Plateau in early summer are related to the circulation patterns at the middle and high latitudes, the differences of physical factors are obviously distinct.更多还原