Journal of Geo-information Science >
Retrieval of Aerosol Optical Depth Using FY3D MERSI2 Data
Received date: 2019-05-05
Request revised date: 2020-01-06
Online published: 2020-11-25
Supported by
National Environmental Protection Standard Preparation and Revision Project(2017-27)
Causes of Heavy Air Pollution and Tackling Key Problems(DQGG0205)
Copyright
Until now, relatively few researches of aerosols retrieval have been conducted using domestic satellite remote sensing. To promote domestic satellite remote sensing applications, a set of rapid inversion technology of Aerosol Optical Depth (AOD) using remote sensing was developed in this study based on FY-3D/MERSI2 data, which combined the advantages of Dark Target (DT) and SARA algorithm. Firstly, the empirical relationship of surface reflectance in traditional Dark Target algorithm was introduced to get the red and blue band surface reflectance. Then, the relationships between aerosol optical thickness, asymmetry factor, and single scattering albedo in red and blue bands were established using long time-series ground observation data from AERONET. Finally, MOD04 and AERONET AOD products were used to validate and evaluate the inversion results. Results show that the AOD retrieved from MERSI2 in this study not only kept the spatial consistency with the MODIS aerosol product, but also presented a reasonable distribution of high AOD values, which improved the AOD inversion in cloud and bright target areas where values were missing in MOD04 aerosol product. Meanwhile, compared with ground-based observations, the proposed algorithm also demonstrated a higher accuracy with an average correlation coefficient greater than 0.85 at the 470nm band. These two methods showed a strong linear correlation at blue band. Finally, the spatial and temporal distribution of aerosols during a heavy pollution in Beijing, Tianjin, Hebei, and surrounding areas from March 9 to March 14 in 2018 was completely captured using MERSI2, which indicated that FY3D satellite was able to monitor aerosols and could provide a reference for haze monitoring and early warning in China. This study provides important reference significance for the development and application of domestic satellites in atmospheric remote sensing business.
CHEN Hui , LI Qing , WANG Zhongting , MA Pengfei , LI Ying , ZHAO Aimei . Retrieval of Aerosol Optical Depth Using FY3D MERSI2 Data[J]. Journal of Geo-information Science, 2020 , 22(9) : 1887 -1896 . DOI: 10.12082/dqxxkx.2020.190206
表1 MERSI2气溶胶反演主要波段光谱参数Tab. 1 MERSI2 channels used in AOD retrieval |
波段序号 | 中心波长/nm | 光谱带宽/nm | 空间分辨率/m | 主要用途 |
---|---|---|---|---|
1 | 470 | 50 | 250 | 获取蓝波段大气辐射传输方程,云像元识别 |
3 | 650 | 50 | 250 | 获取红波段大气辐射传输方程 |
7 | 2130 | 50 | 1000 | 根据经验公式计算红、蓝波段地表反射率,水体和暗像元识别 |
25 | 12 000 | 1000 | 250 | 云像元识别 |
国家风云卫星遥感数据服务网为本研究提供了FY3D/MERSI2数据,AERONET和NASA提供了为本研究提供了CE318观测资料和MOD04数据下载服务,在此一并致谢。
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