摘要
利用常规高空、地面观测数据,NCEP再分析资料以及FY-2C卫星云图资料,对2005年7月1日晚到2日发生在青藏高原东部的区域性暴雨、大暴雨和陕西关中东部的局地性暴雨、大暴雨天气过程进行分析,结果表明:这次暴雨、大暴雨过程发生在深厚的上升气流中,有明显的水汽通量散度辐合和水汽通量输送,同时伴随有一次MβCSs的生消过程,在这次大暴雨过程当中,M C Ss有复杂的辐合—辐散双重结构,而且随着能量的释放,对流层中、高层的辐合—辐散结构不断增强,而低层的辐合—辐散结构不断减弱。
By using the data of routine aerological sounding, surface observation, NCEP reanalysis and FY-2C satellite cloud, in this paper the regional rainstorm and heavy rainstorm over the east Qinghai-Tibetan Plateau and the local rainstorm and heavy rainstorm in the east Guanzhong region of Sbaanxi Province during the period from July 1 to July 2, 2005, are lucubrated. The results show that the rainstorm occurred in a large-scale rising windstream, and there was an obvious vapor flux divergence and a vapor flux transport. Simultaneously, there was an occurrence and disappearance of Mβ CSs process. In the heavy rainstorm process, M CSs had a complicated congregence-divergence structure. With energy release, the congregence-divergence structure in the midand high-level troposphere was continuously intensified, whereas that at low level was continuously decreased. The most rainfall in the rainstorm occurred in the regions with high-energy field of 400-500 hPaθse and the energy field of 700-850 hPa in southeast Gansu Province, such situation was quite different from the energy field of rainstorm in Shaanxi Province. It is considered that the mid- and low-level vapour brought about the heavy rainfall in southeast Gansu Province came from the Bay of Bengal and South China Sea respectively, and the vapor brought about the local heavy rainfall in the Guanzhong region came from South China Sea.
出处
《干旱区研究》
CSCD
北大核心
2007年第4期516-521,共6页
Arid Zone Research
基金
陕西省2001年科技计划项目资助(2001K09-GT)
作者简介
孙健康（1964-），男，陕西渭南人，高工，主要从事天气预报工作．E—mail：liangsangzhongxue@yahoo．com．cn
