气象Issue(8)：948-956,9.DOI:10.7519/j.issn.1000-0526.2014.08.005
2012年7月中旬克拉玛依罕见强对流天气的数值模拟分析
Numerical Simulation on a Rare Severe Convective Event in Karamay City in July 2012
摘要
Abstract
One severe convective weather event which is so rarely seen in arid areas,occurred in Karamay City of Xinjiang on 14 July 2012.The convective event lasted for more than an hour,accompanied by short-time severe downpour and hail.The process of convection is studied with composite dataset including NCEP-FNL analyses,automatic weather station observations,satellite cloud image,Doppler weather ra-dar and simulations of mesoscale numerical model WRF.The results show that,in the background of large-scale instable moist stratification and complex mountain terrain,horizontal temperature gradient and topographic convergence shear get enhanced on the lee side of mountain where convective weather develops easily.The numerical simulation results of WRF model indicate that the configuration of high-and low-level wind,vertical shear of horizontal wind and saddle type of vertical pseudo-equivalent potential temper-ature provides power for the ascending motion,driving the W-wind speed rapidly to the maximum 6.5 m· s-1 and top level of ascending up to 9 km.The thin layer of moist neutral stratification limits the growing of vertical ascending motion so that the area of ascending motion is narrow and small,causing the severe precipitation to happen only in a local area.Mountainous terrain plays an obvious and complicated role in developing strong convection.The convergence of ground wind is enhanced by orographic effect,and the nonlinear disturbance of airflow over mountain prompts the rapid development of severe convection.关键词
干旱地区/强对流/数值模拟/地形作用Key words
arid area/severe convective weather/numerical simulation/effect of terrain分类
天文与地球科学引用本文复制引用
卢冰,史永强..2012年7月中旬克拉玛依罕见强对流天气的数值模拟分析[J].气象,2014,(8):948-956,9.基金项目
中国沙漠气象科学研究基金（SQJ2012014）、公益性行业（气象）科研专项（GYHY201406012）和中央级公益性科研院所专项（IUMKY201312PP0402）共同资助 （）
