2016年张家口地区暴雨过程分析

Analysis of a Rainstorm Event in Zhangjiakou Area in 2016

应用MICAPS常规气象资料、区域站加密降水资料以及NCEP再分析资料,对2016年7月19—20日发生在张家口地区的一次暴雨过程进行综合分析。结果表明,此次强降水过程是由于深厚的冷涡系统与副高外围的暖湿气流交汇而产生,冷涡系统及副高外围暖湿气流、地面倒槽系统为暴雨的产生提供必要的环流背景;各物理量分析表明,张家口地区动力条件、热力条件(不稳定)、水汽条件配合较好,均有利于强降水的发生;湿位涡可以较好地解释此次暴雨的形成机制。

Based on MICAPS conventional meteorological data,regional station precipitation data and the NCEP reanalysis data,a rainstorm event occurred during July 19-20,2016 in Zhangjiakou area was analyzed in this paper. The results showed that the rainstorm event was caused by the intersection of deep cold eddy system and peripheral warm moist air flows of the subtropical high. The cold eddy system, peripheral warm moist air flows of the subtropical high and the ground inverted trough provided essential circulation background for the rainstorm.The analysis of each physical quantity showed that dynamic condition, thermal condition （unstable）and water vapor condition in Zhangjiakou area were favorable for the occurrence of rainstorm. The moist potential vorticity could explain the formation mechanism of this rainstorm well.