宁夏夏季层状暖云降水观测研究  

Observation Study on Precipitation Mechanism of Stratiform Warm Cloud in Ningxia in Summer

作　　者：张丰伟[1] 刘晓莉[2] 桑建人 张逸轩[1] 李义宇[4] 乔晶煜[5] 

机构地区：[1]甘肃省人工影响天气办公室,甘肃兰州730020 [2]南京信息工程大学,江苏南京210044 [3]宁夏气象科学研究所,宁夏银川750002 [4]山西省人工降雨防雹办公室,山西太原030032 [5]甘肃省气象局核算中心,甘肃兰州730020

出　　处：《高原气象》2011年第2期471-481,共11页Plateau Meteorology

基　　金：公益性行业(气象)科研专项(GYHY200906024);国家自然科学青年基金项目(40805057)共同资助

摘　　要：采用Micaps资料和机载PMS实时探测资料,分析了2007年8月26日宁夏银川地区一次层状云降水过程的宏微观物理特征。结果表明,这次降水是由弱锋面云系产生的,整个云层温度在0℃以上,云中没有冰晶质粒存在,为暖云降水,而且云中的分层结构明显;降水的雨滴直径均在2~3 mm以下,降水与云中大粒子的增加有密切关系。暖性层状云降水的可能机制主要是云滴凝结与碰并增长。The macro-micro physical characteristics of the stratiform cloud in Yinchuan on 26 August 2007 are analysed using the weather chart of Micaps system and the data of PMS on the plane.The results show that the precipitation is engendered by the weak frontal cloud system.The temperature of whole cloud is almost above 0 ℃.There is no ice crystal in the cloud,so it is warm stratiform cloud.And the whole cloud is divided into 2 or 3 parts.In base of raindrop size distributions（RSDs） observations,measurements of RSDs during the process are compared,including the mean diameter and the mean volume diameter.It is found that the diameter of the raindrop is less than 2~3 mm,it indicates that the process is engendered by warm stratiform cloud.And the precipitation is closely interrelated with the increase of the large particles in the cloud.The important mechanism during the process is the collision and coalescence process and condensation among the cloud droplets.

关 键 词：宁夏 夏季 暖云 层状云 降水机制 

分 类 号：P426.6[天文地球—大气科学及气象学]