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| MODIS产品估算复杂地形下的光合有效辐射 | |
| 引用本文： | 谢小萍,高志强,高炜.MODIS产品估算复杂地形下的光合有效辐射[J].遥感学报,2009,13(5):785-796. |
| 作者姓名： | 谢小萍 高志强 高炜 |
| 作者单位： | 1. 南京信息工程大学,遥感学院中美合作遥感中心,江苏,南京,210044;中国科学院地理科学与资源研究所,北京,100101 2. 中国科学院地理科学与资源研究所,北京,100101 3. 南京信息工程大学,遥感学院中美合作遥感中心,江苏,南京,210044;美国科罗拉多州立大学,自然资源生态实验室,柯林斯堡,80521 |
| 基金项目： | 国家973基础研究项目(编号: 2009CB421100, 2006CB403404)，国家科技支撑计划项目(编号: 2006BAB04A08)。 |
| 摘 要： | 提出基于MODIS大气和地表产品反演高精度复杂地形下的光合有效辐射模型。该方法是对普通的大气传输模型进行简化, 在模型中分别考虑了削减光合有效辐射的5个主要因子: 瑞利散射、臭氧和水汽吸收、气溶胶散射以及地表和大气间的多次反射。从3个方面考虑了复杂地形对于光合有效辐射的影响: (1) 坡度和坡向; (2) 天空可视角; (3) 邻近地形的附加辐射。提取2006年晴空条件下的估算结果与中国生态网络山东禹城站和长白山站的实测值的比较, 得到相关系数分别为0.924和0.9, 表明模型反演结果能够较好地解译实际光合有效辐射的变化。通过比较考虑地形和不考虑地形2种情况得到的光合有效辐射, 定量地分析了地形对光合有效辐射的影响。 |
| 关 键 词： | 光合有效辐射 MODIS 复杂地形 |
| 收稿时间： | 2008/5/14 0:00:00 |
| 修稿时间： | 2008/9/23 0:00:00 |
Estimation of land instantaneous photosynthetically active radiation over complex terrain based on MODIS porducts |
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| XIE Xiao-ping,GAO Zhi-qiang and GAO Wei.Estimation of land instantaneous photosynthetically active radiation over complex terrain based on MODIS porducts[J].Journal of Remote Sensing,2009,13(5):785-796. | |
| Authors: | XIE Xiao-ping GAO Zhi-qiang and GAO Wei |
| Institution: | 1. Sino-American Cooperation Remote Sensing Center, School of Remote Sensing of Nanjing University of Information Science Tech-nology, Jiangsu Nanjing 210044, China 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;1. Sino-American Cooperation Remote Sensing Center, School of Remote Sensing of Nanjing University of Information Science Tech-nology, Jiangsu Nanjing 210044, China 3. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80521, USA |
| Abstract: | Photosynthetically Active Radiation (PAR) is an important parameter in models of ecosystem dynamics and carbon cycle. A method is presented with which instantaneous PAR can be calculated with high accuracy from Moderate Resolution Imaging Spectroradiometer (MODIS) products and Digital Elevation Model (DEM). The method is based on a simplification of the general radiative transfer equations, which considers five major processes of attenuation of solar radiation: Rayleigh scattering, absorption by ozone and water vapor, aerosol scattering, multiply reflectance between land surface and atmosphere, and three terrain factors: slope and aspect, isotropic sky view factor and additional radiation by neighbor reflectance. Comparing the modeling PAR with observational PAR in Yucheng site and Changbai Mountain site in 2006, the correlation coefficient are 0.929 and 0.904 respectively, and the average errors are 10% and 15% respectively, which should be sufficiently accurate for re-flecting the change of PAR. Comparing modeling PAR with the consideration of complex terrain with modeling PAR without the consideration of terrain, this paper quantificationally analyzes the effect of complex terrain. |
| Keywords: | photosynthetically active radiation (PAR) MODIS products complex terrain |
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