摘要
分析了 1999年 5月 17～ 18日 ,由华北冷涡与长江中、下游切变线系统在山东境内交汇形成的一次较强的降水过程。对这次天气过程进行了飞机连续观测和人工增雨作业。此类降水是山东春季降水系统中的主要过程 ,具有一定的代表性。作业高度为 415 0～ 45 0 0 m,是层状云的中上层。云中含水量较小 ,最大值为 0 .0 35 g/ m3。云粒子浓度最大值为 2 5 0个 / cm3,云粒子直径、浓度空间分布等存在不均匀特性。其降水云系存在明显分层 ,云层之间有一干层 。
Based on weather charts,satellite data,surface precipitation data,GPS,specially the Particle Measuring System(PMS) data,etc,obtained in the cold vortex system in North China,in May 17—18,1999,some features for this type of system were concluded as the fowlloing.①The precipitation process was due to the meeting of the Huabei cold vortex and the shear line system along the Changjiang River.②The precipitation clouds can be divided into two layers, and there is a dry layer among them.In the cloud body,the supercooled water content is low(0 035g/m 3), and its distribution is not even.Due to the existence of the dry layer,the rain droplets evaporate after leaving the clouds.③The maximum cloud particle concentration is 250/cm 3.The cloud particle diameter and concentration are not uniform in the cloud.
出处
《气象》
CSCD
北大核心
2000年第6期16-20,25,共6页
Meteorological Monthly
