【摘要】 本文研究青藏高原背风坡的一种特殊天气现象——云南的早雨季,讨论了直接造成连续性降水的天气系统及其季节演变特征.静力能量诊断表明云南的早雨季与随印度季风的到达而开始的雨季之间有区别;发现每年早雨季开始时间与孟加拉湾的首次风暴出现时间有关系.最后,讨论了它与东亚大气环流季节变化的关联.更多还原

【Abstract】 In this paper, a special weather phenomenon, the "early raining" in Yunnan Pro-vince, which takes place in the lee of the Tibetan Plateau is studied and the synoptic system causing the sustained rain and its features of seasonal variations are discussed. By the diagnostic analysis of static energy,it is found that there are some discrepancies between the "early raining" and the rain season which begins as soon as the arrival of the Indian monsoon, and there are some connections between the times when the ’’ early raining" outset and when the first storm is formed in the Bay of Bengal. Finally, the relations of the "early raining" and the seasonal variations of general circulation in East Asia are also discussed.更多还原