基于MODIS数据估算晴空陆地光合有效辐射
收稿日期: 2003-09-11
修回日期: 2003-11-27
网络出版日期: 2004-01-25
基金资助
973项目资助(2002CB4125)；国家自然科学基金项目(90202002)
Estimation of Land Photosynthetically Active Radiation in Clear Sky Using MODIS
Received date: 2003-09-11
Revised date: 2003-11-27
Online published: 2004-01-25
Supported by
The National 973 Program, No.2002CB4125; National Natural Science Foundation of China, No.90202002
陆-气圈层物质与能量交换的核心过程是植物的光合作用，而光合有效辐射则是影响光合作用过程的关键因子，在不同的陆地生态系统模型中，都是重要的输入参数。作者以MODIS卫星数据为基础，反演晴空下影响光合有效辐射的大气因子参数大气可降水量、气溶胶，根据辐射传输方程从大气顶层光合有效辐射反演高分辨率陆地光合有效辐射。算法采用查找表替换辐射传输模型，使其能够对大批量、像元级的数据进行处理。将该算法应用于对华北平原的部分区域进行反演，并使用中国生态网络禹城试验站的自动测量数据对结果进行检验，最大误差在10%以内。
关键词： 光合有效辐射；MODIS；遥感反演；华北
刘荣高,刘纪远,庄大方 . 基于MODIS数据估算晴空陆地光合有效辐射[J]. 地理学报, 2004 , 59(1) : 64 -73 . DOI: 10.11821/xb200401008
Photosynthetically active radiation (PAR) is a key variable required by almost all terrestrial ecosystem models. Unfortunately, the current incident PAR products estimated from remotely sensed data at spatial and temporal resolutions are not sufficient for carbon cycle modeling. In this paper, a method was proposed to retrieve land surface PAR from MODIS data in non-cloudy sky. Firstly, the maximum PAR in top of atmosphere was calculated in any place and at any time. Then the atmospheric parameters, vapor and aerosol, were estimated from MODIS data. Finally, the land surface PAR was computed by radiative transfer model using atmospheric parameters and sun geometrical information. The method was used to retrieve PAR in Shandong and the result was tested by the ground data in Yuncheng station of CERN with the error less than 10%.
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