上海地区一次阵风锋结构特征与动量收支诊断分析  

Structure Feature and Momentum Budget Analysis of a Gust Front in Shanghai Region

作　　者：岳彩军[1] 袁招洪[2] 陶岚[3] 陈国民[4] 戴建华[3] 谈建国[1] 

机构地区：[1]上海市气象科学研究所(上海市卫星气象遥感应用中心),上海200030 [2]上海市气象局,上海200030 [3]上海中心气象台,上海200030 [4]中国气象局上海台风研究所,上海200030

出　　处：《高原气象》2016年第3期788-799,共12页Plateau Meteorology

基　　金：国家自然科学基金项目(40875025;41175050;41275021;41475039;41475041;41575048);上海市自然科学基金项目(08ZR1422900);公益性行业(气象)科研专项(GYHY201306012;GYHY201506007)

摘　　要：利用多普勒天气雷达资料、自动气象站资料以及WRF模式模拟结果,分析了2012年7月13-14日上海地区发生的一次阵风锋结构特征,并对阵风锋移速成因进行了动量收支诊断分析。结果表明：（1）此次阵风锋天气现象特征明显：气压陡升、风向突变、风速加大、温度及露点温度骤降等,并伴有短时强降水。（2）WRF模式较为完整地模拟了此次阵风锋发展演变及其对上海地区的影响过程。（3）阵风锋后面伴有冷池,冷池主体位于2 km以下,冷池上方伴有负的扰动气压,且2~3 km气柱内有扰动西风下传。冷池强弱直接影响阵风锋强度,扰动西风下传所带动量直接驱动冷池,进而影响到阵风锋形成及其强度。（4）动量收支诊断分析分析表明,垂直平流、气压梯度力对阵风锋的纬向移动有较大贡献。There is a gust front occurred in Shanghai region during 13-14 on July 2012.Based on Doppler radar data,automatic weather station data and outputs from WRF model simulation,the structure feature of gust front was analyzed,and the cause of gust front translation speed was studied on the basis of the momentum budget method.The results are as follows：（1） The weather phenomena of gust front is obvious,such as pressure rising,wind direction inversing,wind speed increasing,temperature and dew-point temperature dropping and so on,along with instantaneous heavy rain.It is noted that above weather phenomena don＇t occur at the same weather station synchronously.（2） The evolution of gust front and its influence process on Shanghai are simulated successfully by WRF model.However,the moving speed of the simulated gust front is slower than that of the observation.（3） There is a cold pool at the back of gust front,lying below 2 km,with negative perturbation pressure above cold pool.Meanwhile,perturbation west wind in the 2 ~ 3 km air cloumn downloads into cold pool.The intensity of cold pool affects the counterpart of gust front directly,and momentum with downloading wind not only drives cold pool directly but also affects the genesis of gust front and its intensity.（4） The analysis of momentum budget shows that vertical advection and pressure gradient force are the primary contributions to the zonal translation of gust front,which discloses the cause of gust front translation quantitatively.

关 键 词：阵风锋 动量收支 WRF模式 冷池 

分 类 号：P458.11[天文地球—大气科学及气象学]