CAJ | 학술논문

利用拉萨多普勒天气雷达、闪电定位仪、欧洲中心500hPa分析场及常规观测等资料,对2008年4月27-28日发生在拉萨的雷暴天气的环境条件和雷达回波特征进行了综合分析.结果表明:这次雷暴过程是在乌拉尔山冷空气南下,加剧了高原低涡切变辐合上升运动的发展,大气层结极不稳定的条件下产生的;雷达径向速度图和VAD风廓线均显示出非常明显的低层暖平流结构、低空急流及垂直风切变特征;γ中尺度气旋式涡旋扰动与环境垂直风切变的相互作用,导致雷暴云发展,回波顶增高,40dBz回波顶高伸展到7.0km左右;CAPE值、垂直风切变、γ中尺度气旋性扰动以及低层暖平流对拉萨雷暴天气预警、预报具有指示意义,给出了拉萨雷暴天气预报思路与着眼点.
이용랍살다보륵천기뢰체、섬전정위의、구주중심500hPa분석장급상규관측등자료,대2008년4월27-28일발생재랍살적뇌폭천기적배경조건화뢰체회파특정진행료종합분석.결과표명:저차뇌폭과정시재오랍이산랭공기남하,가극료고원저와절변복합상승운동적발전,대기층결겁불은정적조건하산생적;뢰체경향속도도화VAD풍곽선균현시출비상명현적저층난평류결구、저공급류급수직풍절변특정;γ중척도기선식와선우동여배경수직풍절변적상호작용,도치뇌폭운발전,회파정증고,40dBz회파정고신전도7.0km좌우;CAPE치、수직풍절변、γ중척도기선성우동이급저층난평류대랍살뇌폭천기예경、예보구유지시의의,급출료랍살뇌폭천기예보사로여착안점.
The weather environments and radar echo features of thunderstorm occurred on April 27th and 28th 2008 in Lhasa are analyzed by using Doppler radar data, lightning data and ECMWF data and conventional meteorological data and so on. The result showed that this thunderstorm in Lhasa was engendered by the cold air which came southward from Ural and strengthened the development of the unstable level and turbulence in Lhasa. Radial velocity map and VAD wind profiler both showed that there were obviously the low-level warm advection structure, low-level jet and vertical wind shears. The interaction between the γ-mesoscale cyclonic vortex disturbance and the environment vertical wind shears led to the developments of thunderstorm cloud and rising of echo top, of which the height of echo of 40 dBz reached to 7 km. The value of CAPE, the γ-mesoscale cyclonic vortex disturbance, vertical wind shears and low-level warm advection structure are good indices to the forecasting and warning of Lhasa thunderstorm. This paper gives the notion and the emphasis of the forecasting of thunderstorm in Lhasa.