北京地区地基天空辐射计与卫星云特性参数对比研究  

Comparison and Analysis of Cloud Optical Properties over Beijing Based on Satellite Data and Sky Radiometer

作　　者：郭文昕 车慧正[2] 陈权亮[1] 肖之盛 GUO Wenxin;CHE Huizheng;CHENG Quanliang;XIAO Zhisheng(College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Chinese Academy of Meteorological Sciences,Beijing 100081,China)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]中国气象科学研究院,北京100081

出　　处：《沙漠与绿洲气象》2021年第6期95-102,共8页Desert and Oasis Meteorology

基　　金：国家自然科学基金(41590874)。

摘　　要：利用2019年中分辨率成像光谱仪(MODIS)卫星数据、搭载在葵花-8卫星上的成像仪(AHI)观测数据和天空辐射计观测数据分析北京城区云光学特性的时空分布特征。结果表明,北京地区的云光学厚度(Cloud optical depth,COD)和云滴有效半径(Cloud drop effective radius,CER)呈现明显时空变化特征。南部地区较高而北部地区较低,夏季的COD明显高于其他季节,最高值为20左右。CER在春季和夏季呈现相反的区域分布特征,春季南低北高,夏季南高北低,而秋冬季CER明显低于春夏两季。通过将天空辐射计观测数据与卫星观测结果对比分析发现二者在COD方面一致性较高,相关系数(r)分别为0.69和0.66,MODIS反演的CER与地基遥感结果一致性较差,r值仅为0.053,而葵花-8反演的CER与地基遥感结果一致性较好,r值达到0.53。The spatiotemporal distribution characteristics about optical properties of cloud in Beijing were analyzed based on the Moderate Resolution Imaging Spectroradiometer(MODIS),the Advanced Himawari Imager(AHI)on board Himawari-8 and the sky radiometer data in 2019,which indicate that the spatiotemporal characteristics of cloud optical depth(COD)and cloud drop effective radius(CER)over Beijing are decreasing from north to south.The maximum of COD was about 20,and the values of COD in summer are obviously higher than that in other seasons.The values of CER in spring and summer show opposite regional distribution characteristics,with a decreasing trend from south to north in spring,and opposite characteristics in summer.In addition,the values of CER in autumn and winter are lower than that in other seasons.The COD between sky radiometer match satellite observations with the correlation coefficient(r)of 0.69 and 0.66 for MODIS and AHI,respectively.Further,CER between MODIS and sky radiometer show poor agreement,with the r values of 0.053.However,both the r of 0.53 for AHI data and sky radiometer suggest a better consistency.

关 键 词：MODIS 葵花-8 云光学厚度 云滴有效半径 时空分布特征 

分 类 号：P407[天文地球—大气科学及气象学]