Fig. 1. Distribution of 25 AERONET sites

Fig. 2. Validation of aerosol products in non-mountainous and mountainous area. (a)―(c) Results of AOD_DT, AOD_DB and AOD_G for non mountainous sites; (d)―(f) results of AOD_DT, AOD_DB and AOD_G for mountainous sites

Fig. 3. Validation results of three aerosol products at different sites. (a)―(c) AOD_DT, AOD_DB, AOD_G_{results in Xinglong; (d)―(f) AOD_DT, AOD_DB, AOD_G resultsin SACOL}

Fig. 4. Validation results of aerosol products in different seasons at Xinglong site. (a) Spring; (b) summer; (c) autumn; (d) winter

Fig. 5. Validation results of aerosol products in different seasons at SACOL site. (a) Spring; (b) summer; (c) autumn; (d) winter

Fig. 6. Validation results of aerosol products at mountainous sites in West Asia. (a) AOD_DT; (b) AOD_DB; (c) AOD_G

Fig. 7. Histogram of residual distribution between simulated and observed values. (a) Simulation of non polarized reflectivity using BRDF model in mountainous areas; (b) simulation of polarized reflectivity using BPDF model in mountainous areas; (c) simulation of non polarized reflectivity using BRDF model in urban; (d) simulation of polarized reflectivity using BPDF model in urban;(e) simulation of non polarized reflectivity using wave relationship model in mountainous areas; (f) simulation of polarized reflectivity using wave relationship model in mountainous areas; (g) simulation of non polarized reflectivity using wave relationship model in urban; (h) simulation of polarized reflectivity using wave relationship model in urban