| 高反射率地区气溶胶光学厚度遥感反演:现状及展望 |
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| 引用本文： | 孙林,柳钦火,刘强,陈良富.高反射率地区气溶胶光学厚度遥感反演:现状及展望[J].地理科学进展,2006,25(3):70-78. |
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| 作者姓名： | 孙林 柳钦火 刘强 陈良富 |
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| 作者单位： | 中国科学院遥感应用研究所, 北京师范大学, 遥感科学国家重点实验室, 北京100101 |
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| 基金项目： | 国家自然科学基金项目(40371087)，中国科学院知识创新工程重要方向项目(KZCX3-SW-338) |
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| 摘 要： | 气溶胶在地球大气辐射收支平衡和全球气候变化中扮演着重要的角色。利用卫星数据反 演水体、浓密植被等暗背景上空的气溶胶光学厚度已经达到了较高的精度， 而对于干旱、半干旱 以及城市等高反射率地区， 气溶胶光学厚度反演仍面临严峻挑战。高反射率地区气溶胶光学厚度 反演的困难主要是地表反射率的确定精度较低; 气溶胶的指示作用随着地表反射率的升高而降 低。为精确反演高反射率地区的气溶胶光学厚度， 国内外开展了大量的研究工作。本文介绍了对 比算法、高反差地表法等几种主要的反演方法， 介绍了这些方法的理论基础， 指出了它们的优势 与不足， 并分析了高反射率地区气溶胶光学厚度反演的发展前景。
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| 关 键 词： | 反演 高反射率地区 气溶胶光学厚度 |
| 收稿时间： | 2006-03-01 |
| 修稿时间： | 3/1/2006 12:00:00 AM |
Aerosol Optical Thickness Retr ieving Over Br ight Sur face: Progr ess and Prospect |
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| SUN Lin,LIU Qinhuo,LIU Qiang,CHEN Liangfu.Aerosol Optical Thickness Retr ieving Over Br ight Sur face: Progr ess and Prospect[J].Progress in Geography,2006,25(3):70-78. |
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| Authors: | SUN Lin LIU Qinhuo LIU Qiang CHEN Liangfu |
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| Institution: | State Key Laboratory of Remote Sensing Science IRSA, CAS, Beijing, 100101 |
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| Abstract: | It is a great challenge to retrieve aerosol optical thickness over bright surface from remotely sensed data,because it is very difficult to estimate the reflectance of the complicated surface accurately,and the radiance is not sensitive to the aerosol change when the surface reflectance is high.To overcome the difficulties of aerosol optical thickness retrieving in the bright areas,many methods were provided.We introduced some significant methods: 1) contrast reduction algorithm.This method applied in a sequence of satellite images which contain a clear image;2) high contrast surfaces algorithm.This method can retrieve aerosol optical thickness from two closely located,high contrast surfaces;3) two or more sensors cooperation method,which can retrieve aerosol optical thickness together with surface reflectance;4) methods which are based on surface reflectance database/model,which need to ascertain the surface reflectance accurately.We analyzed the advantages and disadvantages of each method.At last,we provided the prospect of the aerosol optical thickness deriving over bright surface.The construction of surface reflectance database and the development of the BRDF model make the surface reflectance more accurate,the increasing aerosol measuring stations advance our quantitative understanding of aerosol characteristics,and the design of many new satellite sensors which can derive the aerosol optical thickness becomes more perfect.All of the above factors can help aerosol optical thickness retrieving a lot. |
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| Keywords: | bright surface aerosol optical thickness retrieve |
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