Abstract
Conventional methods for Aerosol Optical Depth (AOD) retrieval are limited to areas with low reflectance such as water or vegetated areas because the satellite signals from the aerosols in these areas are more obvious than those in areas with higher reflectance such as urban and sandy areas. Land Surface Reflectance (LSR) is the key parameter that must be estimated accurately. Most current methods used to estimate AOD are applicable only in areas with low reflectance. It has historically been difficult to estimate the LSR for bright surfaces because of their complex structure and high reflectance. This paper provides a method for estimating LSR for AOD retrieval in bright areas, and the method is applied to AOD retrieval for Landsat 8 Operational Land Imager (OLI) images at 500 m spatial resolution. A LSR database was constructed with the MODerate-resolution Imaging Spectroradiometer (MODIS) surface reflectance product (MOD09A1), and this database was also used to estimate the LSR of Landsat 8 OLI images. The AOD retrieved from the Landsat 8 OLI images was validated using the AOD measurements from four AErosol RObotic NETwork (AERONET) stations located in areas with bright surfaces. The MODIS AOD product (MOD04) was also compared with the retrieved AOD. The results demonstrate that the AOD retrieved with the new algorithm is highly consistent with the AOD derived from ground measurements, and its precision is better than that of MOD04 AOD products over bright areas.
Highlights
Aerosols are colloids of solid particles or liquid droplets suspended in the atmosphere; their diameters range from 10 ́3 to 102 micrometers
Four images with different aerosol loadings were selected to display the aerosol. These results demonstrate that the new algorithm can achieve a continuous Aerosol Optical Depth (AOD) distribution, even distribution
Many methods have been developed for Aerosol Optical Depth (AOD) retrieval, and many aerosol aerosol products from different sensors have been produced based on these methods
Summary
Aerosols are colloids of solid particles or liquid droplets suspended in the atmosphere; their diameters range from 10 ́3 to 102 micrometers. They affect the global climate in direct and indirect ways by absorbing and scattering solar radiation and can seriously influence human health by spreading harmful substances [1,2,3,4,5,6]. It has been widely used to retrieve AOD in areas with dense vegetation based on data from satellite sensors, such as AVHRR (Advanced Very High Resolution Radiometer) [7], SeaWiFS
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