摘要
利用位于河北新乐的CINRAD-SA多普勒天气雷达产品,分析了河北中南部地区2004年的8次冰雹过程,总结了一些冰雹天气的多普勒天气雷达回波特征指标。当回波强度大于等于50 dBz,回波顶高大于等于10 km,垂直累积液态含水量大于等于35 kg/m^2时容易降雹,垂直累积液态含水量越大,冰雹直径越大。回波发展初期2-3体扫内,垂直累积液态含水量迅速增大,一般每个体扫增加10-30 kg/m^2,这是冰雹独特的特征。冰雹指数为实心正三角时,大多有降雹。
The products of CINRAD-SA Doppler Radar located at Xinle, Hebei Province are used to analyze 8 hail processes in the mid-south part of Heibei Province. Some characteristic indexes of Doppler radar echoes for hail weather are summed up. Hailfall is likely to occur when the echo intensify is above 50 dBz, echo top is greater than 10 kin, and vertically integral liquid water （VIL） is above 35 kg/m^2. The diameter of hail is bigger when VIL is larger. During the initial stage of echo development, about 2 to 3 volume scanning, the value of VIL increases rapidly. Generally, it is a feature of hailfall that echo intensity for each of volume scanning increases about 10 to 30 kg/m^2.
出处
《气象科技》
2008年第2期228-232,262,共6页
Meteorological Science and Technology
基金
北京区域中心项目(BRMCCX200614)资助
关键词
冰雹
多普勒雷达
回波特征指标
hail, Doppler radar, echo, characteristic index
作者简介
王福侠，女，1971年生，高级工程师，主要从事天气预报工作，Email：hbqxtwfx@sina．com
