对利用FY2和GMS静止气象卫星建立的东亚地区气候数据集(EAGSCDR FY2 and GMS Geostationary Satellite Climate Data Record over East Asia)进行了检验和评估,使用的检验源数据包括中国地面气候资料与国际卫星云气候计划ISCCP D2月平均云量数据集.对由上述3种不同观测手段得到的多年平均总云量的空间分布特征分析结果表明:3种资料的总云量分布形势有较好的一致性,但是在40°N以北地区,ISCCP和EAGSCDR得到的总云量在量值上高于地面观测值.用地面观测资料检验华南及长江流域EAGSCDR的云检测产品的结果表明,总的准确率为82.10％,总漏判率6.85％,总误判率为11.05％,秋冬季节准确率偏低.EAGSCDR与ISCCP云量都是由卫星资料处理得到的,二者差异主要来自算法的不同,检验结果表明,EAGSCDR中的云量产品精度优于ISCCP云量,并且其时间分辨率可达到1 h,空间分辨率达到5 km,由此可见,EAGSCDR的云产品比ISCCP云产品更有优势.
Validation and Evaluation of Cloud Amount by Geostationary Satellite Data from 1995 to 2010
Using the China surface climate data and the monthly mean data of ISCCP (International Satellite Cloud Climatology Project) D2, EAGSCDR (FY2 and GMS geostationary satellite climate data record over East Asia) are validated and evaluated. The distributions of annual mean total cloud amounts from the three kinds of data are analyzed and compared, and the results show that all the distributive patterns of cloud amounts agree well; however, total cloud amounts from ISCCP and geostationary satellite climate data sets are higher than station observations in the north of 40°N. Furthermore, it is indicated that about 82. 10% cloud detection product samples of EAGSCDR agree with surface observations, and the overall missing detected rate and false detected rate is 6. 85% and 11. 05% respectively over South China and the Yangtze River basin; the accuracy of fall and winter is lower. The cloud amounts of EAGSCDR and ISCCP both are obtained from satellite data, and their major differences come from different algorithms. The analysis shows that the cloud product precision of EAGSCDR is higher than that of ISCCP, and the time resolution can reach 1 hour, and the spatial resolution is up to 5 km. The cloud products of EAGSCDR have advantages over ISCCP.
geostationary satellite, climate data set, cloud amount, cloud detection, quantitative test
NETL
NSTL
万方数据
