| 利用Landsat8数据估算干旱区晴天太阳瞬时和日间净辐射 |
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| 引用本文： | 郭鹏,武法东.利用Landsat8数据估算干旱区晴天太阳瞬时和日间净辐射[J].干旱区地理,2018,41(1):32-37. |
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| 作者姓名： | 郭鹏 武法东 |
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| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院, 北京 100083;2.石河子大学理学院, 新疆 石河子 832003 |
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| 基金项目： | 国家国际科技合作专项项目（编号：2015DFA11660）；石河子大学应用基础研究青年项目（编号：2015ZRKXYQ06） |
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| 摘 要： | 地表净辐射是地球表面的短波和长波辐射输入和输出通量辐射平衡的结果，也是地表蒸散与水热平衡研究中非常重要的方面。利用2014年8月下旬的Landsat8遥感影像，采用BISHT等提出的净辐射估算方法，首先通过计算瞬时大气传输率、瞬时短波太阳辐射和下行长波辐射得到了短波辐射与长波辐射的估算值，并进一步通过计算地表反照率等得到了瞬时净辐射和日均净辐射，最后利用地面实测净辐射值对估算结果进行了验证。研究表明：利用分辨率较高的Landsat8数据和部分气象参数能够很好地模拟该地区晴天的瞬时和日间净辐射的分布，并且与地面实测净辐射值具有较好的一致性，平均误差为14.5 W·m-2。研究弥补了利用其他遥感数据估算地表辐射参数复杂、精度偏低的缺陷，可以适用于干旱地区的晴天瞬时和日间净辐射值的估算，并且能够有效的提高估算精度。
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| 关 键 词： | 净辐射 晴天 瞬时 日间净辐射 Landsat8 |
| 收稿时间： | 2017-08-08 |
Estimating instantaneous solar radiation and daytime net radiation with Landsat8 data on clear-sky days in arid areas |
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| GUO Peng,WU Fa-dong.Estimating instantaneous solar radiation and daytime net radiation with Landsat8 data on clear-sky days in arid areas[J].Arid Land Geography,2018,41(1):32-37. |
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| Authors: | GUO Peng WU Fa-dong |
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| Institution: | 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. College of Sciences, Shihezi University, Shihezi, Xinjiang 832003, China |
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| Abstract: | Surface net radiation is the result of the radiation balance of shortwave radiation flux and longwave radiation flux on the Earth's surface.It is a very important aspect in the research of surface evapotranspiration and hydrothermal equilibrium.In this paper,the net radiation was estimated by using the method proposed by Bisht et al.with the Landsat8 remote sensing image of August 31,2014.First,the shortwave radiation and longwave radiation are estimated by calculating the instantaneous atmospheric transmission rate,instantaneous shortwave solar radiation and downstream longwave radiation.The instantaneous net radiation and daily net radiation were then obtained by calculating the surface albedo.Finally,the verification on the calculated values was conducted using the ground measurement data.With an average error of 14.5 W·m-2,the estimated results were very similar to the measured ones,which indicated that the Landsat8 data and some meteorological parameters can be used to simulate the distribution of the instantaneous solar radiation and daytime net radiation on clear-sky days in this area.The method in this study avoided the computation complexity when using other remote sensing data to estimate the surface radiation parameters and it improved the estimation accuracy. |
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| Keywords: | net radiation sunny day instantaneous daytime net radiation Landsat |
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