Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, 730070, China.
Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, 730070, China.
Sci Rep. 2019 Apr 16;9(1):6174. doi: 10.1038/s41598-019-42466-6.
Aerosol optical depth (AOD) is one of essential atmosphere parameters for climate change assessment as well as for total ecological situation study. This study presents long-term data (2000-2017) on time-space distribution and trends in AOD over various ecological regions of China, received from Moderate Resolution Imaging Spectroradiometer (MODIS) (combined Dark Target and Deep Blue) and Multi-angle Imaging Spectroradiometer (MISR), based on satellite Terra. Ground-based stations Aerosol Robotic Network (AERONET) were used to validate the data obtained. AOD data, obtained from two spectroradiometers, demonstrate the significant positive correlation relationships (r = 0.747), indicating that 55% of all data illustrate relationship among the parameters under study. Comparison of results, obtained with MODIS/MISR Terra and AERONET, demonstrate high relation (r = 0.869 - 0.905), while over 60% of the entire sampling fall within the range of the expected tolerance, established by MODIS and MISR over earth (±0.05 ± 0.15 × AOD and 0.05 ± 0.2 × AOD) with root-mean-square error (RMSE) of 0.097-0.302 and 0.067-0.149, as well as low mean absolute error (MAE) of 0.068-0.18 and 0.067-0.149, respectively. The MODIS search results were overestimated for AERONET stations with an average overestimation ranging from 14 to 17%, while there was an underestimate of the search results using MISR from 8 to 22%.
气溶胶光学厚度 (AOD) 是气候变化评估以及整体生态状况研究的基本大气参数之一。本研究基于 Terra 卫星上的 Moderate Resolution Imaging Spectroradiometer (MODIS)（结合 Dark Target 和 Deep Blue）和 Multi-angle Imaging Spectroradiometer (MISR)，提供了中国各生态区 AOD 的时空分布和趋势的长期数据（2000-2017 年），并利用地面站气溶胶自动网络 (AERONET) 进行了验证。从两台分光辐射计获得的 AOD 数据显示出显著的正相关关系（r=0.747），这表明 55%的所有数据都表明了研究参数之间的关系。MODIS/MISR Terra 和 AERONET 的结果比较表明，两者之间存在高度相关性（r=0.869-0.905），而超过 60%的总采样数据都落在了由 MODIS 和 MISR 在地球上建立的预期容差范围内（±0.05±0.15×AOD 和 0.05±0.2×AOD），其均方根误差（RMSE）为 0.097-0.302 和 0.067-0.149，而平均绝对误差（MAE）分别为 0.068-0.18 和 0.067-0.149。MODIS 的搜索结果对 AERONET 站点的估计偏高，平均高估范围为 14%至 17%，而 MISR 的搜索结果低估了 8%至 22%。
