三江源地区冬半年云光学特性与积雪的分布及相关性研究  

Study on the Distribution and Correlation of Cloud Optical Properties and Snow Accumulation in the Three-River Headwaters Region during the Winter Half Year

作　　者：郭晓宇 程志刚 毕瑞君 GUO Xiaoyu;CHENG Zhigang;BI Ruijun(College of Atmospheric Sciences/Key Laboratory of Plateau Atmosphere and Environment in Sichuan Province,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225

出　　处：《成都信息工程大学学报》2022年第3期302-307,共6页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(41971026)。

摘　　要：为研究三江源地区冬半年云光学特性与积雪分布等的关系,选取近20 a MODIS云顶高度、云光学厚度、气溶胶光学厚度、云覆盖及云粒子有效半径等光学特性数据及卫星遥感积雪数据,利用特征向量、相关性分析等气象统计方法,对三江源地区冬半年(10月-次年4月)云光学特性时空分布特征及其与积雪面积、雪水当量等相关关系进行分析。结果表明,在空间上,云光学厚度、云顶高度呈南高北低分布,其大值区位于杂多中部和治多东部;云粒子有效半径呈北高南低分布,其大值区多分布在曲麻莱县东部及玛多县西侧;气溶胶光学厚度、雪水当量则呈西高东低的分布特征;云覆盖率和积雪覆盖率则呈现相反的分布特征。时间上,气溶胶光学厚度、云光学厚度与云顶高度呈增加趋势,云粒子有效半径、雪水当量、积雪覆盖率、云覆盖率呈微弱减小趋势。云覆盖率与积雪的覆盖率相关性较强,相关系数达0.7,其次是云光学厚度0.43、雪水当量与积雪覆盖率相关系数为0.43,其他因子与积雪覆盖率相关性不显著。In order to study the relationship between cloud optical characteristics and snow distribution in the winter half of the year in the Three-River Headwaters Region,in this paper,based on the recent 20 years of MODIS cloud top height,cloud optical depth,aerosol optical depth,cloud cover and cloud effective radius and other optical characteristics data and satellite remote sensing snow data,combined with characteristic vector,correlation analysis and other meteorological statistical methods,the paper analyses the Three-River Headwaters Region in the winter half of the year(October to April) cloud optical characteristics of spatial and temporal distribution characteristics and its correlation with the snow area,snow water equivalent.The results show that,spatially,the cloud optical depth and cloud top height are distributed high in the south and low in the north,and their large value areas are located in the central part of Zadoi County and eastern part of Zhiduo;cloud effective radius is high in the north and low in the south,and the large value areas are mostly distributed in the east of Qumalai County and the west of Maduo County.Aerosof optical depth and snow water equivalent are distributed high in the west and low in the east;the cloud cover and snow cover show opposite distribution characteristics.As for the part of time,aerosol optical depth,cloud optical depth and cloud top height show an increasing trend,while cloud effective radius,snow water equivalent,snow cover and cloud cover show a slight decreasing trend.The correlation between cloud cover and snow cover is strong,with a correlation coefficient of 0.7,followed by cloud optical depth of 0.43,snow water equivalent and snow cover with a correlation coefficient of 0.43,and the correlation between other factors and snow cover is not significant.

关 键 词：大气科学 气候变化及其诊断 三江源地区 云光学特性 雪水当量 积雪覆盖率 

分 类 号：P467[天文地球—大气科学及气象学]