摘要
云在大气辐射中起重要作用，因此有许多应用高分辨辐射仪（ＡＶＨＲＲ）数据反演云复盖的算法。在国际卫星云气候学计划（ＩＳＣＣＰ）中使用的阀限技术是一种直接方法并为科学界提供了有价值的结果。允许部分云填充卫星象元的空间相关法成功地鉴别了云层并改善了云阴象元品质。ＣＬＡＶＲ（由ＡｖＨＲＲ的云）及ＡＰＯＬＬＯ（在陆云及海洋上的ＡＶＨＲＲ处理）通过使用ＭＣＳＳＴ（多道海面温度）反演能将云型分类并改善无云象元的品质。卫星数据与理论计算吻台最好的汉谱法可同时获得云覆盖，云粒尺度及云发射率，为了建立一个有希望的云覆盖反演系统。
Owing to the important role clouds play in atmospheric radiation，many algorithms have been developed to retrieve cloud cover from Advanced Very High Resolution Radiometer（AVHRR）data. The threshold technique，used in International Satellite Cloud Climatology Project （ ISCCP），is a straightforward method and has provided the scientific community valuable results，Spatial Coherence Method，aiming at allowing for partly cloud filled satellite pixels，successfully identifies cloud layers and improves the quality of cloud overcast plxels．CLAVR（Clouds from AVHRR）and APOLLO（AVHRR Processing over land cloud and ocean），by making use of the MCSST（Multiple Channel Sea Srrface Temperature）retrieval，enables cloud type classification and improves the quality of cloud-free pixels. Bispectral Method，with the best- fit between the satellite data and theoretical calculations，obtains cloud cover，cloud particle size and cloud emissivitv simultaneously. To establish apromising cloud cover retrieval scheme，it seems nscessary to combine the valuable scientific thoughts behind each of the developed algorithms.
关键词
云
复盖
高分辨辐射仪
计算法
:AVHRR；Threshold technique；Spatial coherence method；Bispectral method.
