摘要
该文分析了一次冷涡天气过程中云微物理量的分布特征、降水粒子的增长机制及云下雨滴的蒸发效应．主要结果为：云系由低层暖性Ｓｃ云和冷性主体Ａｓ云组成．Ａｓ云底高２ｋｍ，云顶高大于５ｋｍ，云中存在比较大的过冷水区，－１１．２℃时的过冷水含量０．２１ｇ·ｍ－３，但过冷水的含量分布极不均匀，大于０．０５ｇ·ｍ－３的过冷水区连续分布的宽度８７％小于２．４ｋｍ，不利于云中冰晶的连续凇附增长；同时云下雨滴的蒸发效应大，直径小于１．０ｍｍ的雨滴难以落到地面，因此本次过程只产生弱的降水．
The distribution characteristics of microphysical elements, growing mechanism of precipitation particle and evaporation effects of subcloud raindrop in a cold vortex process are analysed. The results show that the cloud system consists of two vertical layers, lower warm stratocumulus and principal cool altostratus. The altostratus base is 2 km high, and cloud top is higher than 5 km. The supercooled water exists abundantly in the cloud, the maximum is up to 0.21 g·m -3 at -11.20℃, but its distribution is not homogeneous, 87% of continuous distribution width are less than 2.4 km, which is disadvantage to the rime increasing of ice crystal in the cloud. Meanwhile, the evaporation effect of subcloud raindrop is very big, the diameter of raindrops which could not arrive the ground is less than 1 mm. Therefore, The cold vortex process produces the weak precipitation.
出处
《应用气象学报》
CSCD
北大核心
1999年第2期190-198,共9页
Journal of Applied Meteorological Science
基金
山东省教委自然科学基金
关键词
微物理
增长机制
过冷水
冷涡
降水
Microphysics Growing mechanism Supercooled water
