MODIS Aerosol Optical Depth Inversion Over Urban Areas Supported by BRDF/Albedo Products
- PDF / 1,593,536 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 38 Downloads / 187 Views
RESEARCH ARTICLE
MODIS Aerosol Optical Depth Inversion Over Urban Areas Supported by BRDF/Albedo Products Wenhua Zhang1 • Lin Sun1 • Lishu Lian2 • Yikun Yang1,3 Received: 18 September 2019 / Accepted: 25 June 2020 Ó Indian Society of Remote Sensing 2020
Abstract Aerosols play an important role in climate change and environmental pollution, and monitoring of aerosols via remote sensing is of great significance. However, for urban areas that are closely related to people’s lives, remote sensing monitoring of aerosol optical depth (AOD) faces major challenges. These surface types, with bidirectional reflection characteristics, have a high surface reflectivity that is not sensitive to aerosol changes. Therefore, surface reflectivity must be calculated with high precision, which can be difficult using existing methods. To overcome these problems, this paper provides a MODIS AOD inversion method for complex background conditions that is supported by BRDF/Albedo products. Using these products, the accuracy of surface reflectivity and the resulting inversion results of aerosols are improved. Three typical complex background areas (Beijing, Baltimore and Paris) were selected for application testing. AOD inversion was calculated using MODIS BRDF/Albedo data for 6 years from 2012 to 2017. Accuracy was verified using the AERONET ground-based observations in the corresponding areas, and results were compared with the existing MODIS aerosol product (MOD04 AOD). Inversion estimates using this method have a higher correlation with AERONET AOD (R = 0.948). The root mean square error is 0.107, and 70.08% of the points are less than the expected error. When compared with MOD04 AOD products in urban areas, the inversion results of the new algorithm have higher precision and stability. Keywords AOD inversion Urban area BRDF Ross Thick-LiSparseR
Introduction Aerosols play a very important role in climate change and environmental pollution monitoring research, because they directly change the radiation balance mechanism of the Earth-atmosphere system by scattering and absorbing solar short-wave radiation. As a cloud of condensation nuclei, aerosols change the number and lifespan of cloud droplets and radiation characteristics (Forster et al. 2007), and & Lin Sun [email protected] 1
Geomatics College, Shandong University of Science and Technology, Qingdao, Shandong, China
2
College of Geography and Tourism, Qufu Normal University, Rizhao, Shandong, China
3
State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
smaller aerosol particles can enter the body tissue through the respiratory tract, causing respiratory diseases and endangering human health (Huang et al. 2012; Feng et al. 2017). In urban areas with dense populations and industrial centers, as well as industrial and mining enterprises, the environmental effects of aerosols have received increasing attention in recent years. Emissions resulting from daily life, in
Data Loading...
