Replication Data for: Ammonia variability and trends from globally distributed FTIR measurements and model simulations

This dataset contains ammonia (NH3) total columns used in 'Ammonia variability and trends from globally distributed FTIR measurements and model simulations' by Herrera et al. (submitted, 2025). The NH3 total columns are in molecules cm-2, and were retrieved from mid-infrared spectroscopic solar absorption measurements made by ground-based Fourier transform infrared (FTIR) spectrometers at 22 sites. These sites are globally distributed in both hemispheres from 45°S to 80°N, with most of them affiliated with the Network for the Detection of Atmospheric Composition Change (NDACC).