Table 4.

AOD and AAOD Comparisons Between Reanalyses, Models, and Observations

	MERRA-2a,g	MERRAeroa,g	NAAPSb,h	MACCc,i	AeroCom Phase Id,g	Yu et al. Modelse	Yu et al. Obs.f
Sulfate	0.040 ± 0.004	0.039 ± 0.004	–	–	0.034 ± 0.011	–	–
Black Carbon	0.006 ± 0.001	0.006 ± 0.001	–	–	0.004 ± 0.002	–	–
Organic Carbon	0.022 ± 0.006	0.025 ± 0.007	–	–	0.019 ± 0.007	–	–
Dust	0.030 ± 0.010	0.026 ± 0.009	0.039	0.043 ± 0.014	0.032 ± 0.014	–	–
Sea Salt	0.041 ± 0.002	0.034 ± 0.002	0.035	0.055 ± 0.016	0.030 ± 0.015	–	–
Total AOD	0.140 ± 0.013	0.130 ± 0.015	0.137	0.180 ± 0.030	0.127 ± 0.025	0.129 ± 0.033	0.162 ± 0.023
Fine Modeg,h,i	0.068 ± 0.008	0.070 ± 0.011	0.064	0.082	0.063 ± 0.016	–	–
Coarse Modej	0.072 ± 0.010	0.060 ± 0.009	0.073	0.098	0.061 ± 0.024	–	–
AAOD k	0.007 ± 0.001	0.009 ± 0.001	–	0.008 ± 0.002	0.005 ±0.002	–	–

^aClimatological global area-weighted average ± standard deviation of monthly AOD for Y2003 – Y2010.

^bNAAPS aerosol reanalysis calculated for Y2003 – Y2010 from annual average AOD (Lynch et al. 2016).

^cMACC Y2003 – Y2010 global mean and uncertainty from Bellouin et al. (2013).

^dAeroCom Phase I multi-model median and standard deviation from Kinne et al. (2006).

^eMedian and standard deviation from 4 global models considered in Yu et al. (2006).

^fMedian and standard deviation from MODIS Terra, MISR, and combinations of these satellite datasets with GOCART from Yu et al. (2006).

^gFine mode AOD is the sum of sulfate, organic carbon, and black carbon AOD for MERRA-2, MERRAero, and AeroCom.

^hNAAPS fine mode AOD is the sum of anthropogenic fine plus biomass burning AOD.

ⁱMACC fine mode AOD is the sum of anthropogenic plus fine mode natural AOD.

^jCoarse mode AOD is the sum of dust and sea salt.

^kBellouin et al. (2013) use an algorithm to determine aerosol speciation and AAOD, not the native MACC AAOD.