Fig. 1
Comparisons of priori and posterior model estimates of \(\:\text{N}{\text{H}}_{3}\) colum densities and concentrations with observations (CrIS, AMoN, and NTN). (a) Scatterplots of quarterly- and annually-averaged comparison of the prior and posterior \(\:\text{N}{\text{H}}_{3}\) column densities versus CrIS in 2019. (b) (Top) Quarterly comparison of AMoN versus priori and posterior \(\:\text{N}{\text{H}}_{3}\) concentrations using CrIS, (middle) quarterly comparison of NTN versus priori, and posterior \(\:\text{N}{\text{H}}_{4}^{+}\) concentrations using CrIS, and (Bottom) quarterly comparison of NTN versus priori, and posterior \(\:\text{N}{\text{H}}_{4}^{+}\) wet deposition using CrIS. (c) Scatterplots of prior and posterior \(\:\text{N}{\text{H}}_{3}\) concentrations versus AMoN. (d) (Top) Monthly comparison between surface measurements and the posterior constrained by IASI, CrIS, and the combined IASI/CrIS. (Bottom) same as Top, but for wet deposition. The “Post: IASI” is posterior constrained by IASI (green), “Post: CrIS” is posterior constrained by CrIS (red), and “Post: both” is posterior constrained by IASI/CrIS (yellow). The calculations, as well as the plots, were produced with a Python (3.9.5) script (https://www.python.org/downloads/release/python-395/).
