由 张 良承 Aerosol Optical Depth Retrieval Over Ocean and Land From Fengyun-3F MERSI-III: First Results and Validation
风云三号F星MERSI-III海洋与陆地上空气溶胶光学厚度反演：首次结果与验证
引文格式 | Citation:
Yang L, Pei X, Si Y, et al. Aerosol optical depth retrieval over ocean and land from Fengyun-3F MERSI-III: First results and validation[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2025, 18: 25235-25247. DOI: 10.1109/JSTARS.2025.3613696.
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing（中科院2区，IF：5.3）
MODIS
Aerosols
Satellite broadcasting
Spatial resolution
Clouds
Sea surface
Reflectivity
Sea measurements
Satellites
Robot sensing systems
Aerosols
Satellite broadcasting
Spatial resolution
Clouds
Sea surface
Reflectivity
Sea measurements
Satellites
Robot sensing systems
Abstract | 摘要
The Fengyun-3F (FY-3F) satellite, China’s latest launched polar-orbiting meteorological satellite with morning overpass, carries the advanced Medium Resolution Spectral Imager-III (MERSI-III). Sharing similar characteristics with the Moderate Resolution Imaging Spectroradiometer (MODIS), MERSI-III/FY-3F has the potential to fill the observational gap in morning-orbit aerosol monitoring once Terra’s mission concludes. This study adapts the aerosol retrieval algorithm originally developed for the MERSI-II sensor aboard the FY-3D satellite to the MERSI-III sensor. Algorithm improvements have been made to accommodate MERSI-III’s characteristics, primarily focusing on optimizing the surface reflectance estimation model and updating the lookup tables. The improved algorithm has been applied to global MERSI-III observations for the entire year of 2024, and the first aerosol optical depth (AOD) retrieval results over ocean and land for this sensor have been produced and validated. The results show that MERSI-III AOD retrievals agree well with Aerosol Robotic Network data, with 69.8% and 71.0% of retrievals falling within expected error (EE) envelopes over ocean [± (0.03 + 10% )] and land [± (0.05 + 20% )], respectively. The accuracy of MERSI-III retrievals is comparable to that of Terra MODIS dark target products (EE: 65.3% over ocean, 73.4% over land). Comparative analysis of collocated MERSI-III and MODIS AOD datasets reveals consistent spatial patterns, although regional biases are observed in areas with high aerosol loading and near desert fringes. These results indicate that MERSI-III/FY-3F can provide reliable global aerosol observations and is expected to serve as an important candidate for the AOD data record from the morning-orbiting Terra/MODIS satellite.
风云三号F星（FY-3F）是我国最新发射的上午轨道极轨气象卫星，其搭载的中分辨率光谱成像仪-III（MERSI-III）与中分辨率成像光谱仪（MODIS）具有相似特性，有望在Terra卫星任务结束后填补上午轨道气溶胶监测的空白。本研究将最初为FY-3D卫星MERSI-II传感器开发的气溶胶反演算法移植至MERSI-III传感器，并针对其特性进行了算法改进，重点优化了地表反射率估计模型并更新了查找表。改进后的算法应用于2024年FY-3F MERSI-III全球观测数据，首次获得了该传感器在海洋和陆地上的气溶胶光学厚度（AOD）反演结果。验证结果表明：MERSI-III AOD反演结果与气溶胶自动观测网络（AERONET）数据高度吻合，海洋[±(0.03+10%)]和陆地[±(0.05+20%)]上分别约69.8%和71.0%的反演结果位于预期误差范围内，其精度与Terra/MODIS暗目标产品相当（海洋65.3%，陆地73.4%）。进一步对MERSI-III与MODIS匹配AOD数据集的对比分析表明，二者空间分布模式一致，但在高气溶胶负荷区及沙漠边缘存在区域性偏差。这些结果表明，FY-3F MERSI-III可提供可靠的全球气溶胶观测数据，有望成为Terra/MODIS上午轨道卫星AOD数据记录的重要补充。