基于CloudSat/CALIPSO资料的我国北方2个区域云垂直分布差异研究
投稿时间: 2016-05-17  最后修改时间: 2016-08-18  点此下载全文
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邱玉珺 南京信息工程大学 气象灾害教育部重点实验室, 江苏 南京 210044;南京信息工程大学 中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044 qyj@nuist.edu.cn 
王宏奥 南京信息工程大学 中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044  
基金项目:国家自然科学基金资助项目(41475035;41475034)
中文摘要:选用2008年1月-2014年10月的CloudSat/CALIPSO卫星资料,对中国北方两个4°×4°区域云垂直结构及其微物理参量进行了对比研究,区域1(114~118°E,37.5~41.5°N)和区域2(110°E~114°E,37.5~41.5°N)纬度相同经度不同。结果表明:1)区域1(E1)和区域2(E2)暖云层、混合云层和冷云层的云出现概率(Cloud Occurrence Probability,COP)差别较大。E1暖云层COP春季最大,E2则在夏、秋季达到较大值;E1混合层COP最大值出现在冬季,E2则出现在春季;2个区域冷云层COP均在春季达到最大。2)2个区域的COP高值区厚度有明显的季节性差异,E1的COP高值主要出现在夏、冬季,E2则主要出现在春、夏季。E1秋、冬季云体雷达回波最大值强于E2,但春、夏季弱于区域1。3) E2在春、秋季的液水含量、冰水含量、云滴有效半径均高于E1。
中文关键词:消光系数  云出现频率  垂直结构  云水含量  有效半径
 
The vertical distribution of cloud properties in two regions of northern China based on CloudSat/CALIPSO data
Abstract:The cloud vertical structure directly affect the atmospheric heating rate and exert great influence on atmospheric radiation and circulation.This paper focused on investigating the difference of the cloud vertical properties over two 4°×4° adjacent regions centered at(39.5°N,116°E) as E1 region and at(39.5°N,112°E) as E2 in North China.The CloudSat 2B products and the DARDAR products from Cloud-Aerosol-Water-Radiation Interactions(ICARE) from January 2008 to October 2014 were used to give a statistical analysis on the distribution characteristics of the cloud vertical structures and cloud microphysical parameters.
The CALIPSO level 2 products from June 2006 to September 2008 were used to analyze the statistical distribution characteristics of the cloud vertical structures.The latitudes of the two regions are different but the longitude ranges are the same.E1 is centered in the Jing-Jin-Ji metropolis circle where the atmospheric environment such as aerosol pollution levels and humidity conditions are different from that in E2.To investigate the impacts of aerosols on cloud distributions and other properties in different atmospheric environments,the two adjacent regions were selected and compared in terms of the distribution characteristics of the clouds in different temperatures which can reflect the cloud droplet phase.The statistical results show that:
1)The cloud structures of the two regions are obviously disparate in the mixed cloud layer(-40-0℃),warm cloud layer(>0℃) and ice cloud layer(<-40℃).The largest value of the cloud occurrence probability(COP) in E1 in the warm cloud layers appear in spring,which is 4.3 times of that in E2,and the largest one in E2 appears in autumn,which is 4.6 times of that in E1.The COP in the mixed cloud layers in E1 reaches the maximum in winter and in spring in E2 with 71% and 83% respectively.The COP in the ice cloud layers in E1 and E2 both reach maximum in spring with 29% and 16%.
2)There are obvious differences in seasons for the layer thicknesses of the COPs with high values.The layers with large COPs mainly appear in spring and winter in E1 or spring and summer in E2.The higher the height is,the smaller value of the reflectivity with higher cops.The largest reflectivity in E1 is stronger than that in E2 in autumn and winter.
3)The liquid water content(LWC),liquid effective radius(LRE),ice effective radius(IRE) and ice water content(IWC) in E2 are larger than those in E1,which is closely related to the stronger aerosol loading in E1.The statistical characteristics show that the interaction between aerosols and clouds has a complex feedback effect on the changes and liquid water content.The research results from the present study are expected to provide the knowledge that is needed for parameterizing cloud formation in climate models.
keywords:aerosols extinction coefficients  cloud occurrence probability  vertical structure,cloud water content  effective radius
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