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Application of the optimal grouped residual method in retrieving the optical depth of aerosol over land with POLDER multi-angular polarized data

  • role： First author第一作者
  • Affiliation：

    Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

    University of Chinese Academy of Sciences, Beijing 100049, China

  • Email：564994353@qq.com
  • Introduction：高鑫，研究方向为基于偏振多角度观测的气溶胶/云特性反演。E-mail：564994353@qq.com
GAO Xin12,  
  • role： Corresponding author通信作者
  • Affiliation：

    National Satellite Meteorological Centre, China Meteorological Administration, Beijing 100081, China

  • Email：huxq@cma.gov.cn
  • Introduction：胡秀清，研究方向为卫星光学遥感器的辐射定标，气溶胶、沙尘暴和大气可降水等大气参数的卫星反演算法。E-mail：huxq@cma.gov.cn
HU Xiuqing3*,  
  • Affiliation：

    University of Chinese Academy of Sciences, Beijing 100049, China

FANG Wei2,  
  • Affiliation：

    National Satellite Meteorological Centre, China Meteorological Administration, Beijing 100081, China

ZHANG Peng3

resumen

Aerosol is one of the important components of the earth’s atmospheric environment, which has a profound impact on atmospheric transport, climate simulation, environmental research, remote sensing application, pollution monitoring and many other fields. The retrieval of the Aerosol Optical Depth (AOD) over land has always been an important research topic in the study of environment and climate. As an emerging remote sensing method in recent years, multi-angular polarized remote sensing has obvious advantages over traditional optical remote sensing in the problem of land-atmosphere decoupling, which has been rapidly applied and developed in the field of cloud and aerosol. In this study, an Optimal Grouped Residual Method for the aerosol was proposed, which uses the multi-angular polarized data of POLDER Level 1 datasets (Polarization and Directionality of Earth’s Reflectance, France). According to Mie scattering theory, the polarization scattering phase function of atmospheric aerosol were calculated. Then, the polarization reflectance contribution of aerosols was calculated based on the polarization scattering phase function of aerosols, and the polarization reflectance contribution of atmospheric gas molecules and the surface were calculated using empirical formula. Finally, the multi-angular apparent polarization reflectance of the top of the atmosphere under the assumption of single scattering was simulated according to the atmospheric radiative transfer theory, and AOD was retrieved.The retrieval results and accuracy were verified by precisely geographic matching and quantitatively comparing with MODIS (Moderate-resolution Imaging Spectroradiometer) aerosol product (MYD04). The results show that the R-square values of the regression analysis between AOD in this study and MYD04 can reach more than 0.68, and the slopes are close to 1, which reveal a good consistency. The AOD results were also compared with AERONET (Aerosol Robotic Network) in two sites, Beijing and Kanpur, revealing that the variation trends of AOD have good consistency. Furthermore, in order to verify the reliability of the method in this study from a broader spatial-temporal dimension, the AOD results were synthesized on a long time series of multi-day. Similarly, the multi-day synthetic AOD results obtained in this study also showed good consistency with the MODIS results. This method can be applied to multi-angular polarized satellite data (not only POLDER) to generate reliable optical depth products for the aerosol over land.

palabra clave

remote sensing;POLDER;Multi-angular Polarized remote sensing;The optical depth of aerosol over land;Optimal Grouped Residual Method

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