| MODIS C006气溶胶光学厚度产品在京津冀典型环境背景下的适用性 |
| 摘要点击 2163 全文点击 735 投稿时间：2018-04-19 修订日期：2018-07-11 |
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| 中文关键词 中分辨率成像光谱仪(MODIS) 气溶胶光学厚度 暗像元法 深蓝算法 气溶胶融合产品 |
| 英文关键词 MODerate-resolution imaging spectroradiometer (MODIS) aerosol optical depth dark target deep blue combined AOD |
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| 中文摘要 |
| 选取3个代表京津冀地区典型环境背景下的站点——北京、香河和兴隆，利用AERONET地基观测的气溶胶光学厚度（AOD）数据，研究了MODIS针对暗地表的C051暗像元法（DT C051）和C006暗像元法（DT C006），针对亮地表的C006深蓝算法（DB C006），以及融合了暗像元法和深蓝算法的融合产品（Combined C006），探讨了基于上述算法的AOD产品在京津冀地区的适应性.结果表明：①C006算法的改进对北京和香河站点反演AOD的精度改善较大，而在兴隆站点改善不明显；北京站点，C006深蓝算法AOD适用性最佳；位于城郊的香河站，C006暗像元法AOD最接近AERONET AOD；植被茂盛的兴隆站，Combined C006 AOD反演精度最高.②MODIS DT C006在北京站点的反演误差可能是由气溶胶模型与地表反照率共同造成的；MODIS DB C006在香河站点反演误差主要来源于春季的地表反照率和冬季的气溶胶模型两方面.③相较于DT C051 AOD，DT C006有效数据覆盖率有所降低，但DB C006和Combined C006的数据覆盖率有所增加，且Combined C006 AOD产品数据覆盖率最广；结合MODIS AOD与各站点AERONET的对比验证，结果表明，Combined AOD产品在京津冀地区适用性最佳. |
| 英文摘要 |
| By fitting with the aerosol optical depth (AOD) from AERONET ground observations at sites in Beijing, Xianghe, and Xinglong with different environmental backgrounds, MODIS C051 Dark Target (DT C051), C006 Dark Target (DT C006), C006 Deep Blue (DB C006), and C006 Deep Blue/Dark Target merged AOD products were compared and evaluated to understand their applicability in the Beijing-Tianjin-Hebei region. The main conclusions are as follows:① The comparison of the C051 and C006 algorithms shows that the accuracy of the AOD at the Beijing and Xianghe sites notably improved, while an improvement was not observed at the Xinglong site; the DB C006 AOD is closest to the AERONET AOD at the Beijing site and the DT C006 AOD is closest to the AERONET AOD at the Xianghe site; the combined C006 AOD is closest to the AERONET AOD at the Xinglong site. ② The inversion error of the MODIS DT C006 at the Beijing site is caused by the improper selection of the aerosol model and surface reflectance; the inversion error of the MODIS DB C006 is mainly due to surface reflectance in spring and the aerosol model in winter. ③ Compared with the DT C051 AOD, the effective data coverage of the DT C006 is reduced, but that of DB C006 and the combined C006 increased; the combined C006 AOD data have the largest coverage. The results show that the application of the combined AOD product is best for the Beijing-Tianjin-Hebei region. |
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