基于MODIS的春、夏季中国近海气溶胶对于云参数的影响差异研究  

Difference of indirect aerosol effect on cloud in spring and summer over China offshore region based on MODIS

作　　者：邓学良[1,2] 邓伟涛[3] 聂肃平[4] 

机构地区：[1]安徽省气象科学研究所,合肥230031 [2]安徽省大气科学与卫星遥感重点实验室,合肥230031 [3]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044 [4]国家气候中心,北京100081

出　　处：《南京信息工程大学学报（自然科学版）》2014年第4期349-355,共7页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：安徽省自然科学基金(1308085MD55);国家自然科学基金(40905046);江苏省高校自然科学研究面上项目(10KJB170007);气象灾害省部共建教育部重点实验室开发课题(KLME1104)

摘　　要：通过分析中国近海MODIS数据中气溶胶参数与云参数的相互关系,讨论了该区域气溶胶的间接效应及其对于云的可能影响.结果表明,在中国近海,气溶胶具有明显的间接效应,而且由于气溶胶种类和水汽的季节变化,使得气溶胶的间接作用具有很强的时间变化特征.在夏季,由于人为气溶胶占主导,它作为有效的云凝结核,使得气溶胶光学厚度(AOT)分别与云凝结核数(CCN)有正相关、与云滴有效半径(CER)有负相关性、与云光学厚度(COT)也存在着正相关,气溶胶的间接效应明显;在春季,由于沙尘气溶胶盛行,同时沙尘并不是很好的云凝结核,使得气溶胶光学厚度(AOT)分别与云凝结核数(CCN)的正相关减弱、与云滴有效半径(CER)则由夏季的负相关变为正相关、与云光学厚度(COT)存在弱的负相关,气溶胶的间接效应不明显.Based on analysis of linear relationship between aerosol parameters and cloud parameters in MODIS da-ta,indirect aerosol effect was discussed over the China offshore region.The result showed that indirect aerosol effect indeed exists over the China offshore region.Meanwhile,indirect aerosol effect varies with time,which is a result of the changing of aerosol variety and water vapor content during different seasons.During the summer（e.g.August） time,anthropogenic aerosol is the most important component of aerosol in cloud,which is an effective cloud conden-sation nuclei.The dominance of anthropogenic aerosol,coupled with sufficient water vapor,contributes to the remark-able indirect aerosol effect in summer. The analysis results show that strong positive correlation exists between aerosol optical thickness（AOT） at 550nm and number of cloud condensation nuclei （CCN）,negative correlation exists between AOT and cloud effective radius （ CER） ,and positive correlation exists between AOT and cloud opti-cal thickness（COT）.While during the spring（e.g.April） time,dust is the dominant component of aerosol,which is a bad cloud condensation nuclei,and the water vapor content decreases. As a result,both the positive correlation be-tween AOT and CCN,and the negative correlation between AOT and COT,turn to be weak.While the correlation be-tween AOT and CER changes from negative in summer to weakly positive in spring.The indirect aerosol effect is not pronounced in spring over china offshore region.

关 键 词：中分辨率成像光谱仪( MODIS ) 气溶胶 云 中国近海 

分 类 号：P401[天文地球—大气物理学与大气环境]