西北半干旱区激光雷达探测卷云几何特征和光学厚度

J4 ›› 2013, Vol. 30 ›› Issue (1): 66-72.

西北半干旱区激光雷达探测卷云几何特征和光学厚度

王瑾，张镭，王宏斌，刘瑞金，周碧，黄忠伟，闭建荣，张北斗，张武

兰州大学大气科学学院半干旱气候变化教育部重点实验室，甘肃兰州，730000

出版日期:2013-01-28 发布日期:2013-01-11
通讯作者: 张镭（1960—）山西临汾人，博导，教授，主要从事大气物理和大气环境研究。 E-mail:zhanglei@lzu.edu.cn
作者简介:王瑾(1988—)，女，陕西咸阳人，硕士研究生，主要从事激光雷达及卷云特性研究。E-mail: wang_j_2010@lzu.edu.cn
基金资助:
国家重点基础研究发展规划项目(2010CB428604); 国家自然科学基金资助项目(41075104)

Lidar observations of spatial and temporal variations of cirrus clouds over semi-arid areas in Northwest

Wang Jin, Zhang Lei, Wang Hongbin, Zhou Bi, Zhou Tian, Huang Zhongwei, Bi Jianrong, Zhang Beidou, Zhang Wu

Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China

Published:2013-01-28 Online:2013-01-11

摘要/Abstract

摘要：

为了研究中国西北半干旱区卷云几何特征和光学特性的时空分布特征，我们利用兰州大学半干旱气候与环境观测站（SACOL，35.95°N，104.14°E）的微脉冲激光雷达（MPL-4B）探测卷云过程，分析讨论了卷云的结构、光学性质及其时间变化特征，结果表明，卷云高度分布范围为7－10km，卷云经历了薄－厚－薄的过程，平均厚度为2.0±0.5km。卷云环境温度在－51～－39℃范围之内。卷云的光学厚度在0.084－1.649之间，光学厚度随几何厚度的增加而增大，平均光学厚度为0.651±0.403。多次散射效应对光学厚度大于0.3的卷云影响较大。卷云激光雷达比为17±17sr。薄卷云的激光雷达比要比厚卷云的大。光学厚度小于0.3的光学薄卷云出现高度在8.6km以上，环境温度低于－45℃，几何厚度小于1.5km，雷达比分布在5－69 sr。

关键词: 遥感, 几何和光学特征, 透过率法, 卷云

Abstract:

In order to understand the spatial and temporal variations of cirrus over semi-arid areas in northwest of China, macrophysical and optical characteristics of cirrus clouds were observed by Micro Pulse Lidar (MPL-4B) over Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL, 35.95°N, 104.14°E). The structures and optical properties of the cirrus clouds as well as their spatial and temporal variations are discussed and analyzed. Our results show that cirrus clouds change from thin to thick, observed ranging from 7 to 10km, with a mean thickness of 2.0±0.5km. During this period, the samples have temperature between －51 and －39℃. The cloud optical depth increases and then decreases with increasing geometrical depth, ranging from 0.084 to 1.649, with a mean value of 0.651±0.403. Lidar ratio of cirrus clouds is 17±17sr and we have found that lidar ratio of optically thin cirrus is more than that of thick cirrus. Thin cirrus clouds with ambient temperature below －45℃ occurr above 8.6km and its thickness is lower than 1.5km. The lidar ratio of thin cirrus is between 5 and 69sr.

Key words: remote sensing, geometrical and optical properties, transmittance method, cirrus clouds

王瑾，张镭，王宏斌，刘瑞金，周碧，黄忠伟，闭建荣，张北斗，张武. 西北半干旱区激光雷达探测卷云几何特征和光学厚度[J]. J4, 2013, 30(1): 66-72.

Wang Jin, Zhang Lei, Wang Hongbin, Zhou Bi, Zhou Tian, Huang Zhongwei, Bi Jianrong, Zhang Beidou, Zhang Wu. Lidar observations of spatial and temporal variations of cirrus clouds over semi-arid areas in Northwest[J]. J4, 2013, 30(1): 66-72.

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