气象学报Issue(2)：366-389,24.DOI:10.11676/qxxb2014.013
华北积层混合云中冰晶形状、分布与增长过程的飞机探测研究
Ice crystal habits,distribution and growth process in stratiform clouds with embedded convection in North China:Aircraft measurements
摘要
Abstract
Ice crystal habits,distribution and growth process in the two cases of stratiform clouds with embedded convection on 18 April 2009 and 1 May 2009 are analyzed with the data observed during the Beijing Cloud Experiment (BCE).The results show that ice crystal habits in clouds with temperature between 0-- 16℃ were predominantly of plate,needle-column, capped-column and dendrite type,as well as irregular.Ice crystal habits were affected by the cloud top temperature (CTT)and were different with the change of CTT.Plate and needle-columns were predominant habits as CTT warmer than -8℃,but dendritic and capped-column crystals were observed just as CTT colder than-13℃ and -18℃,respectively.At the same time,ice crystal habits were also affected by their locations in cloud,and there were a lot of heavy rimed crystals in embedded convective regions.Above the melting layer,ice particle grew mainly by the deposition,riming and aggregation process,and the riming process became more intense in a lower cloud layer due to the increase of supercooled liquid water content.The broadening rate of Particle Size Distributions (PSDs)is obviously different between embedded convections and stratiform clouds in the vertical direction.For example,at levels 4.8-4.2 km (-11.6--8℃),the PSDs broadening rate in embedded convections is 3 mm/km,and smaller than 3.67 mm/km in stratiform clouds,but at levels 4.2-3.6 km (-8--5℃),the PSDs broadening rate in embedded convections is 6.67 mm/km,which was almost three times as big as 2.33 mm/km in stratiform clouds.This is mainly due to that embedded convections had more supercooled liquid water than stratiform clouds at levels 4.2-3.6 km.关键词
积层混合云/飞机探测/冰晶形状/增长过程/谱拓宽速率Key words
Stratiform clouds with embedded convection/Aircraft measurement/Ice crystal habit/Growth process/The broadening rate of PSDs分类
天文与地球科学引用本文复制引用
朱士超,郭学良..华北积层混合云中冰晶形状、分布与增长过程的飞机探测研究[J].气象学报,2014,(2):366-389,24.基金项目
国家科技支撑计划项目（2006BAC12B03）、公益性行业（气象）科研专项（GYHY201306065、GYHY200806001）、江苏省普通高校研究生科研创新计划资助项目（CXZZ130508）、中国气象科学研究院基本科研业务专项（2011Z005）。 （）
