Fig. 2
The spatial distribution of a-priori (model results with no satellite data), a-posteriori (results using CrIS satellite data), and the difference between the two, \(\:\text{N}{\text{H}}_{3}\) emissions in 2019. (a) The spatial distribution of a-priori (model results with no satellite data, blue), a-posteriori (results using CrIS satellite data, red), and the difference between the two, \(\:\text{N}{\text{H}}_{3}\)emissions in 2019. (b) Annual estimates of prior and posterior \(\:\text{N}{\text{H}}_{3}\) emission based on different regions; SCUS: South-Central United States, TX: Texas, OK: Oklahoma, NM: New Mexico, Other: western Arkansas and Louisiana, and southern Kansas, Colorado, and Missouri, NEM: Northeastern Mexico, NWGOM: Northwestern Gulf of Mexico, Domain: domain of interest in this study. (c) Quarterly and annual estimate of prior and posterior \(\:\text{N}{\text{H}}_{3}\) emission in the South-Central United States. Emission estimates are expressed in gigagrams of nitrogen per year (Gg N a⁻¹) and gigagrams of nitrogen per quarter (Gg N q⁻¹). The calculations, as well as the plots and maps, were produced with a Python (3.9.5) script (https://www.python.org/downloads/release/python-395/).
