青藏高原东北部两次区域性大到暴雨对比分析

Contrastive Analysis on Two Regional Heavy-Hard Rainfalls in the Northeast of Qinghai-Tibetan Plateau

利用常规气象观测、自动站资料和NCEP/NCAR1°×1°再分析资料,对2015年6月19~20日(简称"6.19")和8月1~3日(简称"8.1")发生在青海省东部的两次区域性大到暴雨天气从环流背景、各物理量场特征进行对比分析,结果表明:两次过程都是地面有冷空气从河西走廊扩散南下,地面伴有辐合线;散度场上高层辐散,低层辐合的配置,整层大气都具有强烈的上升运动;水汽条件特征表现为高层干冷,中低层暖湿,700h Pa上比湿均在8g/kg以上;强降水产生的区域均为Ki>32℃的区域。

By contrasting and analyzing two regional heavy - hard rainfalls in the east of Qinghai province on June 19 to 20 （“6. 9” for short） and August 1 to 3 （ “ 8.1”for short） ,2015 using conventional meteorological observation,automatic station data and NCEP/NCAR10 xl° reanalysis data. The results show that： there are cold air from the hexi corridor southward on the ground with convergence line of two processes, it is high-level divergence, low - level convergence on the divergence field, there is a strong upward movement of the whole layer of the atmosphere. Water vapor characteristic shows that dry and cold on high - level, and warm and wet on low - level, specific humidity are both more than 8g/kg on 700hPa, heavy rain all occurred area where is Ki 〉 32℃.