| Significant overestimation of global aerosol optical thickness by MODIS over land |
| |
| 作者姓名： | XIA Xiang’ao |
| |
| 作者单位： | XIA Xiang’ao Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，China |
| |
| 基金项目： | Acknowledgements The author thanks NASA researchers and numerous AER0NET principal investigators for providing satellite and ground-based aerosol data. Suggestions from three reviewers, especially the discussion about cloud contamination with one of reviewers are greatly appreciated. The research is supported by the National Natural Science Foundation of China （Grant Nos. 40305002, 40333029 and 40520120071）. |
| |
| 摘 要： | Global aerosol optical thickness (AOT) data over land obtained from the Moderate Resolu-tion Imaging Spectroradiometer (MODIS) are evaluated through comparisons with AOT data retrieved by Aerosol Robotic Network (AERONET). In general, MODIS overestimates AOT except at a few AERONET sites in Africa and eastern Asia. MODIS/AOTs are, on average, larger than AERONET/AOTs by 0.041 and 0.090 at 470 nm and 660 nm, respectively. The AOT bias at 660 nm is significantly correlated to the surface reflectance at 2130 nm. Both facts suggest that the underestimation of the surface reflectance is the principal reason for this bias at 660 nm. To use the MODIS/AOT at 470 nm is strongly recommended because it is much more reliable than the AOT at 660 nm.
|
| 关 键 词： | MODIS AOT 重要评估 整体气溶胶光学厚度 主要原因 |
| 收稿时间： | 2005-07-07 |
| 修稿时间： | 2005-07-072005-12-27 |
Significant overestimation of global aerosol optical thickness by MODIS over land |
| |
| Xiang’ao Xia.Significant overestimation of global aerosol optical thickness by MODIS over land[J].Chinese Science Bulletin,2006,51(23):2905-2912. |
| |
| Authors: | Xiang’ao Xia |
| |
| Institution: | (1) Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China |
| |
| Abstract: | Global aerosol optical thickness (AOT) data over land obtained from the Moderate Resolu-tion Imaging Spectroradiometer (MODIS) are evaluated through comparisons with AOT data retrieved by Aerosol Robotic Network (AERONET). In general, MODIS overestimates AOT except at a few AERONET sites in Africa and eastern Asia. MODIS/AOTs are, on average, larger than AERONET/AOTs by 0.041 and 0.090 at 470 nm and 660 nm, respectively. The AOT bias at 660 nm is significantly correlated to the surface reflectance at 2130 nm. Both facts suggest that the underestimation of the surface reflectance is the principal reason for this bias at 660 nm. To use the MODIS/AOT at 470 nm is strongly recommended because it is much more reliable than the AOT at 660 nm. |
| |
| Keywords: | MODIS AERONET AOT |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
