青藏高原东北侧地区干湿年夏季环流异常的对比分析

使用NCEP/NCAR1968～1997年6～8月平均再分析全球网格点资料以及同期青藏高原东北侧17站夏季总降水量观测资料，对青藏高原东北侧典型干湿年夏季平均的大尺度环流场和物理量场差异进行了对比分析，探讨了青藏高原东北侧夏季干湿年形成的原因和机制。结果表明，青藏高原东北侧区域干湿年夏季对应的大尺度环流场和有关物理量场差异明显，最后给出了青藏高原东北侧夏季干湿年的物理图像，为短期气候预测提供依据。

Contrast on the Large Scale Circulation Anomaly over Tibetan Plateau Northeastern Side for Drought and Rainy in Summer

The potential height fields, wind vector fields, vorticity fields and the divergence fields at the range of East Asia in summer over the northeastern side of the Tibetan Plateau for the typical drought years (1982,1974,1991) and the typical rainy years(1978,1979,1984)were analyzed and calculated respectively by using the NCEP/NCAR global reanalysis monthly grid data (2.5°× 2.5°)and the observed monthly precipitation at 17 stations in northeastern side of the Tibetan Plateau for the period 1968 to 1997. The results show that the circulation patterns over the northeastern side of the Tibetan Plateau in drought and rainy years are obviously different. The causes and mechanisms for this drought and rainy are also discussed. Finally, the physical images on the relation of circulation and precipitation anomaly over the northeastern side of the Tibetan Plateau in summer were given out in order to provide basis for short-term climatic forecast.