Fig. 4 | Nature Communications

Fig. 4

From: Observational constraint on cloud susceptibility weakened by aerosol retrieval limitations

Fig. 4

Model global mean susceptibility of cloud droplet size and susceptibility of precipitation probability when accounting for the retrieval uncertainty. Susceptibilities SRe (a) and SPOP (b) are evaluated when the MODIS AOD retrieval uncertainty is imposed. The MODIS AOD retrieval uncertainty, expressed as expected error (EE = ± (a + r AOD), where a is the absolute error and r is the relative error), is imposed on CAM5_orb in the form of random noise with a normal distribution with the standard deviation of EE. Colored lines represent SRe and SPOP as a function of absolute and relative errors imposed on the CAM5_cld results. The CAM5_orb, CAM5_orb with MODIS Collection 5 EE (CAM5_MODC5), and CAM5_orb with MODIS Collection 6 EE (CAM5_MODC6) are depicted by circle, square, and triangle, with vertical bars denoting the range of SRe and SPOP for a range of LWP from 20 to 200 g m−2. The difference of SRe and SPOP between CAM5_orb and the estimates with zero errors is caused by the cloud clearing procedure. The MODIS Collection 5 EE is ± (0.05 + 0.15 · AOD) over land and ± (0.03 + 0.05 · AOD) over ocean35. The MODIS Collection 6 EE is ± (0.05 + 0.15 · AOD) over land and + (0.04 + 0.10 · AOD) and −(0.02 + 0.10 · AOD) over ocean36. Due to the asymmetry of the MODIS Collection 6 EE over ocean, two normal distributions (with the standard deviation of 0.04 + 0.10 · AOD and 0.02 + 0.10 · AOD, respectively) are produced. The positive part of the first distribution and the negative part of second distribution are used to represent the full MODIS Collection 6 EE and are superimposed on the CAM5_cld AOD results

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