Fig. 1
(a) Time series of global mean AOD from the GEOS-Chem-APM, and MODIS, MISR and SeaWiFS from 2004 to 2012. The results from 16 AeroCom models are also marked in the figure; (b) time series of AOD over ocean; (c) over land; (d) time series of total AOD for clear sky and all sky, as well as the contributions of each aerosol components.
Table 1. Comparisons of AOD in clear sky from the GEOS-Chem-APM with satellite data MODIS, MISR and SeaWiFS, and comparisons in 72 AERONET sites having at least 36 months data available between the model and the observations. The AERONET sites with low quality and low spatial domain are also excluded
Fig. 2
Multi-year averaged AOD from MODIS, MISR, and SeaWiFS (a, b, c), and absolute differences between the GEOS-Chem-APM and MODIS, MISR and SeaWiFS in clear sky (d, e, f).
Fig. 3
Seasonal mean differences of AOD between the GEOS-Chem-APM and MODIS (a, d, g, j), MISR (b, e, h, k), and SeaWiFS (c, f, i, l) in DJF, MAM, JJA and SON.
Fig. 4
Locations of 72 AERONET sites used in the study.
Table 2. Comparisons of aerosol optical depth (AOD) between the GEOS-Chem-APM (τ1), and AERONET (τ2), MODIS/MISR (τ3), SeaWiFS (τ4) in North America, where d is the absolute difference between the model and observations, and R correlation coefficient and s standard derivation. The negative differences are marked in blue, and the positive are marked in red. The R in black denotes that the correlation coefficient pass the Student's t-test (α=0.01), otherwise in yellow. Mean values and standard deviation are also summarised in the bottom rows. The results are listed from low to high AOD observed from AERONET
Fig. 5
Seasonal cycle (a and c) from the GEOS-Chem-APM, AERONET, MODIS and MISR in site BONDVILLE and GSFC over North America. The error bars over the curves denote the standard deviations. Time series of AOD contributed from each aerosol component and comparisons with AERONET from 2004 to 2012 (b and d).
Table 3. Same as Table 2, but for Europe
Fig. 6
Same as Fig. 5 but for AERONET site Ersa and Toulou over Europe.
Table 4. Same as Table 2, but for East Asia
Fig. 7
Same as Fig. 5 but for AERONET site Xianghe and Anmyon over East Asia.
Table 5. Same as Table 2, but for North Africa
Fig. 8
Same as Fig. 4 but for AERONET site IER_Cinzana and Saada over North Africa.
Fig. 9
Same as Fig. 4 but for AERONET site Mongu and Skukuza over South Africa.
Table 6. Same as Table 2, but for South Africa
Table 7. Same as Table 2, but for South America
Fig. 10
Same as Fig. 4 but for AERONET site Alta_Floresta and Campo_Grande_SO over South America.