利用CALIPSO卫星2006年6月至2010年5月四年的5 km二级云产品数据对CALIPSO星载激光在全球海洋上空的穿透性进行统 计分析,分别讨论了穿透概率随年度变化、季节变化、昼夜变化及地理位置的变动情况,同时分析了产品版本因素对分 析结果造成的影响。分析表明,海洋上空的数据中探测到云层的约占72.2%,其中不透明云层约占有云数据的61.4%,即 可穿透云层获得海面信息的数据约占有云数据的38.6%,加上未探测到云层的激光,总共约有占总数据量55.6%左右 的激光数据可以用来探测海面信息。使用不同的版本数据分析穿透率结果约有9%的变化。

Global penetrability statistics of CALIPSO over ocean laser samples are derived from the CALIPSO Level 2 5-km lidar cloud layer products between June, 2006 and May, 2010. The effects of the changes of year, season, day/night and geographic location are discussed so as the effect of the different product versions. Results show that cloud layers are detected in about 72.2% of the total over ocean lidar profiles, and 61.4% of the cloudy samples have opaque cloud layer. That means 38.6% of the cloudy samples can get the sea surface information, and together with the cloudless laser samples, about 55.6% of the total lidar samples can be used to detect the information of the sea surface. The different product versions can cause about 9% change in the results.