一次暴雪过程前后近地层物理量场特征分析  

A case study on the characteristics of the physical quantity fields on the near-surface layer during a snowstorm process

作　　者：王林[1] 覃军[1,2] 陈正洪[3] 

机构地区：[1]中国地质大学大气物理与大气环境研究所,湖北武汉430074 [2]中国气象局气候研究开放实验室,北京100081 [3]武汉区域气候中心,湖北武汉430074

出　　处：《大气科学学报》2011年第3期305-311,共7页Transactions of Atmospheric Sciences

基　　金：国家科技支撑计划项目(2008BAC48B02);中国气象局气候研究开放实验室(LCS)开放课题(LCS-2006-08);国家重点工程"湖北鄂东长江公路"气象观测论证与保障服务项目(KY200601)

摘　　要：利用铁塔风梯度观测资料和超声风温仪观测资料,对2008年1月18—21日暴雪前后,湖北黄石长江岸边近地层风场和湍流作了计算分析,探索其异常变化特征,为认识黄石地区暴雪近地层发生发展的物理过程提供依据。结果表明,暴雪前,风向转变,水平风速和垂直风速明显增大,湍流通量的输送较活跃,湍流动能和湍流强度有显著峰值出现;降雪过程结束后,湍流动能再次增大后缓慢减弱。可见此次暴雪过程前后近地层物理量场有异常变化。Base on the observational data obtained from tower in Huangshi area along the Yangtze River,a detailed study on an ice storm process on 18—21 January 2008 is made in this paper.The unusual characteristics can provide the basis to understand the Huangshi area snowstorm’s surface layer physical process.The results show that：before the precipitation,the wind direction changed,the horizontal and vertical wind speed increase obviously,the turbulent flux become active,the turbulent kinetic energy and the turbulence intensity presented obvious peak values;after the precipitation,the turbulent kinetic energy reached to another peak value and then weakened slowly.Thus,obvious changes of the physical quantity field occurred before and after the snowstorm

关 键 词：暴雪 近地层 物理要素 湍流 

分 类 号：P426.63[天文地球—大气科学及气象学]