基于CloudSat与CALIPSO联合观测研究全球云分布特征
投稿时间: 2018-01-04  最后修改时间: 2018-04-13  点此下载全文
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作者单位E-mail
唐雅慧 南京信息工程大学 735752777@qq.com 
周毓荃 中国气象科学研究院 zhouyq05@163.com 
蔡淼 中国气象科学研究院  
马茜蓉 南京信息工程大学  
基金项目:国家重点研发计划项目:云水资源评估研究与利用示范
中文摘要:本文利用2007~2010年CloudSat和CALIPSO资料,统计分析了全球云的发生频率以及云量的水平和垂直分布,并与单独CloudSat资料得到的结果进行对比,讨论了CALIPSO观测到的云的空间分布特性。结果表明:全球平均总云量约0.69,云量高值区主要集中在南半球60°S附近西风带、北太平洋风暴路径带,其次是赤道辐合带(ITCZ),而云量低值区集中在北非沙漠地区及印度洋北部等地。CloudSat/CALIPSO资料与CERES等多种云观测资料获得的总云量分布都基本一致,但CloudSat/CALIPSO资料联合使用能更好地反应云的垂直结构。将联合观测的统计结果与使用CloudSat资料统计的云量分布结果对比,可以发现,CALIPSO在陆地上方可以观测到更多云雷达探测不到的高空冰云,且随着温度的降低,观测优势越来越明显;同时还可以观测到一些海洋上层云光学厚度较薄且未形成降水的暖云以及粒径较小的过冷水云。CALIPSO观测到的云顶粒子半径较小但数浓度较大的冰云主要分布在ITCZ、南半球60°S附近西风带和北太平洋风暴路径带地区,云量最大为0.31,占该地区冰云总量的28%以上;而这些未形成降水的暖云主要是在10~20℃温度范围内南北美洲和南非西海岸地区,云量最大可达到0.4,占该地区暖云总量的50%以上;过冷水云则主要是在-10℃~0℃温度范围内的南半球60°S附近西风带,云量也增加了0.1以上,约占混合云的15%。上述结论可以为全球云场、云水资源分析和气候模式中云的评估提供更好的依据。
中文关键词:CloudSat,CALIPSO,全球,云分布,云量
 
Research global distribution of clouds based on CloudSat and CALIPSO combined observations
Abstract:Using the CloudSat and CALIPSO data products from 2007 to 2010, statistical analyzed the horizontal and vertical distribution characters of cloud cover and the frequency of cloud. Subsequently, compared the results with CloudSat data alone, to discuss the spatial distribution characteristic of cloud by CALIPSO observed. the results show that:Global mean total cloud amount is 0.69, high values mainly concentrate in the southern hemisphere near 60°S westerlies, north Pacific storm track and the equatorial convergence zone (ITCZ), and low values occur in the North African desert regions and the northern Indian Ocean. The distribution of total cloud amount obtained by CloudSat/CALIPSO data is basically consistent with that obtained by various cloud observations such as CERES, but the CloudSat/CALIPSO combination data can response cloud vertical structure better and provides a better basis for the global cloud region. Comparing the statistical results of the joint observations with the distribution results of cloud using CloudSat data alone, high ice clouds in land could be detected more by CALIPSO rather than radar, and with the decrease of temperature, the advantage of the identification of cloud is becoming more and more obvious; At the same time, CALIPSO can also observe some warm clouds with thinner upper cloud optical thickness and no precipitation, as well as small particle size. ice clouds observed by CALIPSO which particle radius is small on the top are mainly distributed in ITCZ, the southern hemisphere near 60° S westerlies and north Pacific storm track belt region, and these warm cloud with no precipitation mainly in 10~20℃ temperature range of north and South America and South Africa's west coast, supercooled water cloud is mainly in -10℃~0℃ temperature range of the southern hemisphere near 60°S westerlies. The above conclusions can provide a better basis for the assessment of clouds in the global cloud region, cloud water resource analysis and climate model. Keyword: CloudSat,CALIPSO,global,distribution of clouds,cloud amount
keywords:CloudSat,CALIPSO,global,distribution of clouds,cloud amount
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