中国农业气象

• 论文 • 上一篇    下一篇

基于MODIS数据的东北地区大气水汽含量反演

吴俊杰;宋开山;刘志明;王宗明;杜嘉;曾丽红;姜广甲;王沫威;   

  1. 中国科学院东北地理与农业生态研究所;东北师范大学城市与环境科学学院;
  • 出版日期:2010-06-10 发布日期:2010-06-10
  • 基金资助:
    中国科学院知识创新工程重要方向项目(KZCX2-YW-340;KZCX2-YW-341)

MODIS-based Retrieval of Atmospheric Water Vapor Content in Northeast China

WU Jun-jie1,2,SONG Kai-shan1,LIU Zhi-ming2,WANG Zong-ming1,DU Jia1,ZENG Li-hong1,JIANG Guang-jia1,WANG Mo-wei2(1.Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,China;2.College of Urban and Environmental Science,Northeast Normal University,Changchun 130024)   

  • Online:2010-06-10 Published:2010-06-10

摘要: 利用2008年6-8月的MOD IS数据,通过两通道比值法和三通道比值法反演了东北地区的大气水汽含量,为了对比研究这两种方法,本文结合探空实测数据对反演结果进行了精度验证。结果表明,两通道比值法更适合东北地区的大气水汽含量反演,反演结果与探空实测数据线性方程的决定系数为0.81。进一步比较代表林地、农田、草地的探空站的反演值与实测值,发现两通道比值法均优于三通道比值法,其中林地的反演精度最高(方程的R2=0.92)。最后,利用两通道比值法的反演结果和土地利用分类数据对大气水汽含量的空间分布状况进行了分析,表明在其他条件相似时,大气水汽含量与土地利用类型之间有密切联系,各土地利用类型平均大气水汽含量的大小顺序在不同时间大致相同,除旱田外,均表现出水体>水田>湿地>林地>草地>未利用地的变化规律,这与下垫面蒸散情况一致。

关键词: MODIS, 两通道比值法, 三通道比值法, 大气水汽含量

Abstract: Based on MODIS data during June to August in 2008,the atmospheric water vapor content in Northeast China was retrieved by using the two-channel and the three-channel ratio method.The results showed that the two-channel ratio method performed better for the water vapor retrieval in Northeast China,and the determination coefficient for the regression of the retrieved water vapor against the measured value was 0.81.Further more,the comparison of estimated vapor content and real ground data from the sounding stations over the woodland,cropland and grassland revealed that two-channel ratio method was better than three-channel ratio method,and woodland obtained the highest retrieval precision with the determination coefficient of 0.92.Finally,the spatial distribution characteristic of vapor content was analyzed by comparing the data retrieved from the two-channel ratio method with land-use classification data.The atmospheric water vapor content was closely correlated with land-use types when other conditions were similar.Except for dry cropland,the order of average vapor content for different types of land use was basically the same: water-body>paddy-field>woodland>grassland>unused,which was consistent with the evapo-transpiration pattern of underlying surface.

Key words: MODIS, MODIS, Two-channel ratio method, Three-channel ratio method, Atmospheric water vapor