Convective Initiation by Topographically Induced Convergence Forcing over the Dabie Mountains on 24 June 2010

查看全文 作　　者：Qiwei [1]WANG;Ming [1,2]XUE;Zhemin [1]TAN

机构地区：[1]Key Laboratory of Mesoscale Severe Weather and School of Atmospheric Sciences,Nanjing University;[2]Center for Analysis and Prediction of Storms and School of Meteorology,University of Oklahoma

出　　处：《Advances in Atmospheric Sciences》索引2016年第33卷第10期,共17页

基　　金：primarily supported by the National Natural Science Foundation of China(Grant Nos.41375061,41130964 and 41461164008);the National Program on Key Basic Research project(973)(Grant Nos.2013CB430103 and 2012CB417200);the Special Public Sector Research of China(Grant No.GYHY201006004) 摘　　要：The initiation of convective cells in the late morning of 24 June 2010 along the eastward extending ridge of the Dabie Mountains in the Anhui region,China,is studied through numerical simulations that include local data assimilation.A primary convergence line is found over the ridge of the Dabie Mountains,and along the ridge line several locally enhanced convergence centers preferentially initiate convection.Three processes responsible for creating the overall convergence pattern are identified.First,thermally-driven upslope winds induce convergence zones over the main mountain peaks along the ridge,which are shifted slightly downwind in location by the moderate low-level easterly flow found on the north side of a Mei-yu front.Second,flows around the main mountain peaks along the ridge create further convergence on the lee side of the peaks.Third,upslope winds develop along the roughly north–south oriented valleys on both sides of the ridge due to thermal and dynamic channeling effects,and create additional convergence between the peaks along the ridge.The superposition of the above convergence features creates the primary convergence line along the ridge line of the Dabie Mountains.Locally enhanced convergence centers on the primary line cause the initiation of the first convection cells along the ridge.These conclusions are supported by two sensitivity experiments in which the environmental wind(dynamic forcing) or radiative and land surface thermal forcing are removed,respectively.Overall,the thermal forcing effects are stronger than dynamic forcing given the relatively weak environmental flow. 关键词：整体收敛大别山对流地形敏感性实验数值模拟数据同化沟道效应

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Convective Initiation by Topographically Induced Convergence Forcing over the Dabie Mountains on 24 June 2010

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