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九江地区一次无降水致灾大风天气过程分析
引用本文:马中元,许爱华,贺志明,李德俊,支树林.九江地区一次无降水致灾大风天气过程分析[J].气象与减灾研究,2009,32(3):52-56,I0004,I0006.
作者姓名:马中元  许爱华  贺志明  李德俊  支树林
作者单位:1. 江西省气象科学研究所,江西,南昌,330046
2. 江西省气象台,江西,南昌,330046
3. 江西省人工影响天气领导小组办公室,江西,南昌,330046
基金项目:江西省气象局2008年重点科研项目 
摘    要:使用常规地面观测、风能观测、卫星云图和多普勒天气雷达等资料,对2009年6月5日23时-6日01时,江西九江地区出现的一次无降水致灾大风天气过程进行分析。结果表明,500hPa冷涡槽后强大的西北气流、925hPa波动型辐合线和异常3h变压是造成这次无降水致灾大风天气的主要影响系统和动力条件;中尺度对流云团在消散过程中,强烈下沉气流冲击地面形成阵风锋,即使对流云团消散后,这股下沉气流仍惯性移动,并继续影响下游长达百余千米范围;阵风锋前沿边界会造成大气折射率的改变,雷达可以从反射率和速度场上探测到这种不连续面的窄带回波。窄带回波移动速度可以定性判断地面大风级别,移速大风力大,移速小风力小。

关 键 词:致灾大风  对流云团  阵风锋  窄带回波。

ANALYSIS OF A RAINLESS DAMAGING STRONG WIND PROCESS
Ma Zhongyuan,Xu Aihua,He Zhiming,Li Dejun,Zhi Shulin.ANALYSIS OF A RAINLESS DAMAGING STRONG WIND PROCESS[J].Meteorology and Disaster Reduction Research,2009,32(3):52-56,I0004,I0006.
Authors:Ma Zhongyuan  Xu Aihua  He Zhiming  Li Dejun  Zhi Shulin
Institution:1. Jiangxi Provincial Insthute of Meteorology Science, Nanchang 330046, China 2. Jiangxi Provincial Meteorological Observatory, Nanchang 330046, China 3. Weather Modification offtce of Jiangxi Province, Nanchang 330046, China)
Abstract:The data of routine surface observation, wind energy tower, satellite, and Doppler weather radar are used to analyze a rainless damaging strong wind process, which influenced Jiujiang, Jiangxi from 23:00, June 5 to 01:00, June 6, 2009. The results show that the prevailing northwest airflow behind the trough of 500 hPa cold vortex, the fluctuation convergent line at 925 hPa and the abnormal 3 h surface allobaric were the main influencing systems and dynamic conditions for this case. Strong downdraft hit the ground to form gust front in the dissipating phase of MCC. Even after the dissipating phase of MCC, the downdraft continued to impact the downstream area more than 100 km. the leading edge of gust front caused the variation of atmospheric refractive index. Therefore, this discontinuous narrow-band echo can be detected by radar reflectivity and velocity fields. The conclusion is that the propagation speed of gust front is useful for estimating the grade of wind, namely, the wind force varies with the propagation speed.
Keywords:Rainless damaging strong wind  MCC  Radar narrow-band echo  
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