| 基于TM/ETM+影像反演祁连山七一冰川反照率精度比较研究 |
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| 引用本文： | 毛瑞娟,蒋熹,郭忠明,吴红波,王盛.基于TM/ETM+影像反演祁连山七一冰川反照率精度比较研究[J].冰川冻土,2013,35(2):301-309. |
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| 作者姓名： | 毛瑞娟 蒋熹 郭忠明 吴红波 王盛 |
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| 作者单位： | 1. 中国科学院 寒区旱区环境与工程研究所 冰冻圈科学国家重点实验室, 甘肃 兰州 730000;
2. 南京信息工程大学 大气科学学院 气象灾害省部共建教育部重点实验室, 江苏 南京 210044 |
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| 基金项目： | 全球变化研究国家重大科学研究计划项目，国家自然科学基金项目 |
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| 摘 要： | 冰川反照率是联系冰川与气候、 寒区水文过程的纽带, 也是制约分布式冰川能量-物质平衡模型发展的重要因子.冰雪反照率的变化会改变整个地气系统的能量收支平衡, 亦可引起局地以至全球的气候变化.利用Landsat TM/ETM+数据, 运用不同学者提出的窄波段转换宽波段的方程, 反演了祁连山七一冰川总短波段的反照率.把不同的转换方程得到反演值与实测值进行比较, 选择绝对误差最小的反演公式.结果表明: Duguay1992模型提出的方程能保证4景影像反演值与实测值的绝对误差在0.05范围内, 而气候模式输入的反照率产品要求绝对误差在0.05以内.运用该方程反演的反照率结果, 较其他方程要准确, 可为分布式冰川物质-能量平衡模型的构建提供更准确的参数数据.
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| 关 键 词： | 反照率 遥感反演 窄波段 宽波段 |
| 收稿时间： | 2012-10-10 |
| 修稿时间： | 2012-12-23 |
Study of the Inversion Precision of Albedo on the Qiyi Glacier in the Qilian Mountain Based on TM/ETM+ Image |
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| MAO Rui-juan,JIANG Xi,GUO Zhong-ming,WU Hong-bo,WANG Sheng.Study of the Inversion Precision of Albedo on the Qiyi Glacier in the Qilian Mountain Based on TM/ETM+ Image[J].Journal of Glaciology and Geocryology,2013,35(2):301-309. |
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| Authors: | MAO Rui-juan JIANG Xi GUO Zhong-ming WU Hong-bo WANG Sheng |
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| Institution: | 1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Scierces, Lanzhou Gansu 730000, China;
2. Key Laboratory of Meteorological Disaster ofMinistry of Education, College of Atmospheric Science, Nanjing University of InformationScience & Technology, Nanjing Jiangsu 210044, China |
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| Abstract: | Glacier albedo links glacier to climate, hydrological processes in cold regions, and is an important factor that restricts the development of the distributed glaciers energy-material balance model. Snow albedo change will change the energy balance of the earth-atmosphere system, and also cause local, as well as global, climate change. In this paper, Landsat TM and ETM+ data are utilized to retrival the albedo on the Qiyi Glacier in the Qilian Mountains by using different equations to convert narrow band to wide band snow cover. A best inversion formula is chosen based on error analysis. It is revealed that the equation proposed by Duguay and Leddew (1992) is able to guarantee four images, whose inversion with measured value has absolute errors within 0.05. Inversion albedo from the equation might input to the mass balance model and the distributed glacier mass-energy balance models more accurately, improving glacier mass balance study. |
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| Keywords: | albedo remote sensing inversion narrow band wide band |
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