| 卫星对地遥感应用中的邻近效应研究 |
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| 引用本文： | 刘广员,邱金桓.卫星对地遥感应用中的邻近效应研究[J].大气科学,2004,28(2):311-319. |
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| 作者姓名： | 刘广员 邱金桓 |
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| 作者单位： | 中国科学院大气物理研究所,北京,100029;中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金资助项目40175009 |
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| 摘 要： | 利用Monte-Carlo地气耦合辐射传输模式比较系统地进行了卫星视反射率对地表、大气和卫星参数的敏感性数值试验,重点研究了邻近效应对地表反射水平非均一分布的敏感性、邻近效应有效地表范围以及邻近效应与卫星高度的关系三个方面的问题.在定量分析的基础上,揭示了影响邻近效应的主要因子及其影响机制,给出了一些重要结论,包括:地表非均一引起的邻近效应的影响是非常重要的,特别是当目标反射率小于环境反射率时;气溶胶光学厚度越大,散射相函数对称性越强,卫星视反射率对环境反射率越敏趑感,邻近效应越明显;邻近效应的有效地表范围可达到几十公里,同样光学厚度条件下,与气溶胶相比,分子的有效地表范围更大,邻近效应也更强;卫星观测同一目标物时,邻近效应随着探测器高度增高而变大等.
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| 关 键 词： | 邻近效应 卫星遥感 视反射率 水平非均一反射地表 |
| 文章编号： | 1006-9895(2004)02-0311-09 |
Adjacency Effect of Satellite Remote Sensing on Land Surface Studies |
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| LIU Guang-Yuan and QIU Jin-Huan.Adjacency Effect of Satellite Remote Sensing on Land Surface Studies[J].Chinese Journal of Atmospheric Sciences,2004,28(2):311-319. |
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| Authors: | LIU Guang-Yuan and QIU Jin-Huan |
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| Abstract: | Sensitivities of satellite apparent reflectance to parameters of surface, atmosphere and satellite measurements are simulated with a 3-dimensional Monte-Carlo model. Researches are mainly focused on three aspects: Sensitivities of satellite apparent reflectance to non-uniform reflection surface;to the effective surface range;and relations between adjacency effect and satellite altitude. Based on the sensitivity, the main adjacency effect factors and mechanism are uncovered. Some notable results are given as follows: Adjacency effect caused by surface's non-uniformity is of high importance. On the kind of oasis surface adjacency effect is especially distinct. The bigger the aerosol optical depth and the more symmetric the scattering phase function, the stronger the sensitivity is. Within a fair large horizontal range the adjacency surface has effect on satellite apparent reflectance, and the more symmetric (for example, molecular) the phase function is, the bigger the effective surface range is. For a certain surface target, the higher the satellite altitude is, the bigger the adjacency effect is. |
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| Keywords: | adjacency effect satellite remote sensing apparent reflectance non-uniform reflection surface |
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