一次暖季少动型高原涡个例分析

文章选取发生在2005年7月15日至16日的一次伴随有明显降水的少动型高原涡过程,利用高时空分辨率再分析资料、常规气象观测资料和降水观测资料,对此次少动型高原涡过程的环流形势、物理量、动力结构、热力结构和降水特征等进行分析,探讨高原涡初生、成熟和消亡阶段结构特征的演变。得出此次高原涡生命史为12 h,是不发展型或源地型高原涡,没有发生东移。在物理量上,各物理量都有相对应的上升和下沉区,可以较好地印证高原涡过程结构的演变,为预报降水、移动轨迹和是否继续发展提供依据。降水落区与低涡移动路径对应,降水强度不大,24 h降水量达到30 mm,为大雨。最大降水时段在16日0~6时,随着降水结束低涡消亡。

In this paper, a low-motion plateau vortex process accompanied by obvious precipitation from July 15 to 16,2005 is selected, and the circulation situation, physical quantity, dynamic structure, thermal structure and precipitation characteristics of the stationary plateau vortex process are analyzed by using high spatio-temporal resolution reanalysis data,conventional meteorological observation data and precipitation observation data, and the evolution of the structural characteristics of the plateau vortex in the initial, mature and extinction stages is discussed. The main conclusions are as follows: the life history of the plateau vortex is 12 hours, it is an undeveloped or source-type plateau vortex, and no eastward movement has occurred. In terms of physical quantities, each physical quantity has corresponding rising and sinking areas, which can better confirm the evolution of the process structure of the plateau vortex and provide a basis for predicting precipitation, moving trajectory and whether it continues to develop or not. The precipitation area corresponds to the moving path of the low vortex,and the precipitation intensity is small, and the 24-hour precipitation reaches 30 mm, which is heavy rain. The maximum precipitation period is from 0:00 to 6:00 on the 16 th, and the vortex dies with the end of precipitation.