MODIS近红外大气可降水含量与乌鲁木齐地基GPS水汽数据的对比分析  

Comparison Analysis between Retrieval Data of MODIS Near-Infrared Precipitable Water Vapor and GPS Precipitable Water Vapor in Urumqi

作　　者：崔彩霞[1] 杨青[1] 赵玲[1] 李杨[1] 

机构地区：[1]中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2008年第1期1-4,共4页Desert and Oasis Meteorology

基　　金：中国气象局乌鲁木齐沙漠气象研究所所长基金资助

摘　　要：本研究在建立HDF数据图像显示、数据提取和分析平台的基础上,利用乌鲁木齐地基的GPS水汽数据,对比分析了2004年6月2日—8月2日之间37d的MODIS近红外大气可降水含量的精度。发现MODIS反演的近红外PW系统性地比GPS探测的PW偏小,但在变化趋势上是相似的,说明MODIS反演的近红外大气可降水含量还是能够反映水汽的变化趋势。37d中降水出现的日期对应于PW的大值日期,尤其与GPS的大PW日数非常吻合。MODIS近红外大气柱可降水含量能够提供大面积水汽空间分布数据。每天一次的水汽分布数据能够用于研究水汽的时空分布和气候特征。该研究开发的MODIS水汽数据分析处理平台也可应用于其它MODIS反演产品的分析,如地表面温度、气溶胶光学厚度等。Based on building the display of HDF data images, the platform of data extraction and analysis, made use of the ground-based GPS Precipitable Water Vapor （GPS PWV） in Urumqi, this study contrasted and analyzed the precision of the retrieval data of MODIS near-infrared Precipitable Water Vapor （MODIS PWV） during Jun 2-Aug 2 2004, total 37days. The results showed that the retrieval data of MODIS PWV was lower than GPS PWV systematically, but the variety trends of both were similar. These meant that the retrieving MODIS PWV was able to reflect the changing directions of water vapor. Among the 37days, the raining days were well corresponding with the large value dates of PWV and with the GPS PWV especially. According to this study, MODIS PWV can provide the spatial distribution data of water vapor in large areas. This kind data with once in everyday were very useful to exploring the spatio-temporal distributions and climatic characteristics of water vapor. The analyzing and processing platform of MODIS PWV data was developed by this study can not only applied to PWV products, but also to other MODIS retrieving products, such as Land Surface Temperature and Aerosol Optical Depth etc.

关 键 词：可降水含量 MODIS 地基GPS 

分 类 号：P228.4[天文地球—大地测量学与测量工程]