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大气科学  2009 

利用星载激光雷达资料研究东亚地区云垂直分布的统计特征

DOI: 10.3878/j.issn.1006-9895.2009.04.04

Keywords: Cloud-AerosolLidarandInfraredPathfinderSatelliteObservations,云量,云的垂直结构

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Abstract:

已有研究表明:云的垂直结构(简称CVS)是一个在卫星资料反演和气候模式预测中很重要的云特征。本文通过利用美国2006年刚发射的卫星CALIPSO(Cloud-AerosolLidarandInfraredPathfinderSatelliteObservations)所负载的激光雷达Level2_05km的云数据,研究了东亚地区(18°N~53°N,74°E~144°E)云的垂直分布特征。结果表明:东亚地区多层云云量在夏季、秋季、冬季、春季分别为43.6%、29.6%、21.1%、33.3%,而多层云分布中双层云比例最大。云顶和云底高度除了随季节变化显著外,还有明显的区域特征。单层云、双层云以及三层云的云顶和云底高度的数据显示,三层云中最上层的云顶和云底最高,并始终高于两层云中最上层云的云顶和云底高度。平均云层厚度季节变化不明显,其值普遍在0.9~2km范围之间。而云层间距同样没有明显的季节和区域变化,其出现的概率随距离的增大而减小。其中,间距在0.35km的概率最大,占到将近50%。而间距在1.45km附近的概率大约为15%,高一点的可达到20%。

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