Fig. 1. Flowchart of the UNL-VRTM components（Documentation of UNL-VRTM）

Fig. 2. The size distribution of two aerosol models

Fig. 3. Polar plots total DFS of aerosol parameters（a-d）and total DFS of surface parameters（e-h）varying with observation angle in coarse-dominated aerosol model　Note：The solar zenith angle is 30°，the polar radius represents observation zenith angle from 0°to 75°and the polar angle is relative azimuth angle from 0°to 180°，the scenarios S1-S4 are defined as Table 2

Fig. 4. Polar plots total DFS of aerosol parameters（a-d）and total DFS of surface parameters（e-h）varying with observation angle in fine-dominated aerosol model Note：The scenarios S1-S4 and polar coordinates are defined similar to Fig. 3

Fig. 5. The variation of total DFS of aerosol parameters with the scattering angle in different aerosol models

Fig. 6. The variation of DFS with observation angles of aerosol parameters in coarse-dominated aerosol model Note：polar coordinates are defined similar to Fig. 3

Fig. 7. The variation of DFS with observation angles of aerosol parameters in fine-dominated aerosol model Note：Polar coordinates are defined similar to Fig. 3

Fig. 8. Polar plots of surface parameters varying with observation angles　Note：a-g represent the DFS distribution of surface reflectivity at 410，443，555，670，865，1 610 and 2 250 nm in the coarse-dominated aerosol model. while h-n represents the DFS distribution in the fine-dominated aerosol model；Polar coordinates are defined similar to Fig. 3

Fig. 9. Polar plots with angular distribution of a posteriori relative error（0∼1）of inversion parameters Note：Polar coordinates are defined similar as Fig. 3

Fig. 10. Variation of total DFS of aerosol parameters（a-d）and surface（e-h）parameters with AOD and surface albedo in coarse -dominated aerosol model

Fig. 11. Variation of total DFS of aerosol parameters（a-d）and total DFS of surface（e-h）parameters with AOD and surface albedo in fine -dominated aerosol model