Fig. 5: Comparison of the observed and modeled average slopes and probability distribution function for ammonium balance and hygroscopic growth factor. | Communications Earth & Environment

Fig. 5: Comparison of the observed and modeled average slopes and probability distribution function for ammonium balance and hygroscopic growth factor.

From: Chemical transport models often underestimate inorganic aerosol acidity in remote regions of the atmosphere

Fig. 5: Comparison of the observed and modeled average slopes and probability distribution function for ammonium balance and hygroscopic growth factor.

Comparison of observations (black solid line) and averages of AEROCOM-II (red dashed-dot) and post-AEROCOM-II (blue dashed-dot) model results for (a–c) NH4_Bal versus log10(inorganic PM1) slopes, (d–f) normalized probability distribution function (PDF) of NH4_Bal, and (g–i) normalized PDF of estimated HGF for observations. For (g–i), the HGF values are from Supplementary Fig. 5, and for average values of RH from observations (~50%, ~35%, and ~35% for the boundary layer, free troposphere, and upper troposphere, respectively). For all data from models in comparison with observations, see Supplemental Figure 10. The model bands shown represent the range in the model results. The respective composite R2 are shown in (a–c).

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