沙漠与绿洲气象2018，Vol.12Issue(1)：61-70,10.DOI:10.12057/j.issn.1002-0799.2018.01.009
新疆巴州一次短时强降水过程的中尺度特征分析
Mesoscale Characteristic Analysis of a Short-term Heavy Rainfall in Bayingolin Mongol Autonomous Prefecture of Xinjiang
摘要
Abstract
Based on the conventional observation data,TBB from FY-2G satellite,NCEP/NCAR reanalysis data with 1°×1° spatial resolution,sounding and Doppler radar reflectivity factor and radial velocity data in Korla of Xinjiang,the meso-scale characteristic and the mechanism of a short-term heavy rain event were analyzed by the 25-point smooth filter methods.The rain occurred in Bayangol Mongol Autonomous Prefecture of Xinjiang from 23rd to 24th on August 2016.The results show that:the coupling of"three-branch jet"and the formation of meso-scale cyclonic convergence on 700 hPa played an important role to the development of upward motion and vapor convergence uplift in precipitation area.The short-time strong precipitation was directly induced by the high temperature and humidity on lower levels,the inrush of arid cold air on middle levels and the formation of surface meso-scale convergence line.At the same time,the low-level water vapor saturation,instable convection stratification,medium -intensity vertical wind shear and strong temperature gradient lapse rate provided good potential conditions for the occurrence and development of the severe convective storm.The radar echo of the heavy rainfall presented a low-quality heart.The precipitation efficiency is higher and the duration is longer,which leads to the large quantities of cumulative precipitation.The short -term heavy rainfall in Korla and its surrounding areas was caused by a number of meso-γ scale storm broken up by the bow echo in the course of slow moving eastward.关键词
短时强降水/低通滤波/中尺度天气系统/干空气侵入Key words
short-term heavy rainfall/low -pass filtering/mesoscale weather system/dry air invasion分类
天文与地球科学引用本文复制引用
刘国强,佟欣怡,杨莲梅,周雪英,杨柳..新疆巴州一次短时强降水过程的中尺度特征分析[J].沙漠与绿洲气象,2018,12(1):61-70,10.基金项目
中央级公益性科研所基本科研业务费专项(IDM2016001),中亚大气科学研究基金(CASS201722),巴州气象局科研基金(201701)共同资助. （IDM2016001）
