新疆阿勒泰地区一次暴雨过程分析

Analysis of a Rainstorm Process in Aletay of Xinjiang

摘要: 利用常规高空、地面资料、区域加密雨量站以及每6h一次的NCEP再分析资料(1˚*1˚)，使用天气学诊断方法，初步分析了2013年6月21日阿勒泰地区暴雨天气过程的环流背景及影响系统、物理量特征，结果表明：1)落区移动路径表现为明显的“大圆弧”型,为典型的东灌型强降水。2)南亚高压双体型、伊朗副高南北震荡、西太副高西伸北挺、髙中低空“三股气流”的相互配合及低层的切变线共同配置构成了此次暴雨天气。3)500 hPa 垂直螺旋度的分布与天气系统和强降水有很好的对应关系，能量锋与K指数>32℃的不稳定能量中心为暴雨提供了良好的能量和不稳定条件。4)地形作用加深了辐合上升运动。

Abstract: By using conventional upper data, surface data, regional encrypted rainfall station and NCEP rea-nalysis data (1 degree * 1 degree) of every 6 h at a time and the synoptic diagnosis method, a pre-liminary analysis of the circulation background and influence system and the physical quantity characteristics of rainstorm weather process in Aletai area on June 21, 2013 was done. The results showed that: 1) The moving path in falling area was shown as "big arc" type, which was a typical east irrigation type strong precipitation. 2) The South Asia high double size, Iran subtropical high north-south oscillation, pair-type South Asia high pressure, Iranian subtropical high north-south oscillation, western Pacific subtropical high pressure enlarged west and lifted northward, three airflows cooperated with each other in upper level jet, middle level jet and low level jet, and the low-level shear line constituted the rainstorm weather. 3) 500 hPa distribution of the vertical he-licity and the weather system and strong rainfall had a good corresponding relationship. The un-stable energy center of energy front and K-index > 32˚C provided favorable energy and unstable conditions for rainstorm. 4) Terrain effect enhanced the upward motion of convergence.