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Presented here is the validation of the CrIS (Cross-track Infrared Sounder)fast physical NH3 retrieval (CFPR) column and profile measurements using ground-based Fourier transform infrared (FTIR) observations. We use the total columns and profiles from seven FTIR sites in the Network for the Detection of Atmospheric Composition Change (NDACC) to validate the satellite data products. The overall FTIR and CrIS total columns have a positive correlation of r  =  0.77 (N  =  218) with very little bias (a slope of 1.02). Binning the comparisons by total column amounts, for concentrations larger than 1.0  ×  1016 molecules cm−2, i.e. ranging from moderate to polluted conditions, the relative difference is on average ∼ 0–5 % with a standard deviation of 25–50 %, which is comparable to the estimated retrieval uncertainties in both CrIS and the FTIR. For the smallest total column range (< 1.0  × 1016 molecules cm−2) where there are alarge number of observations at or near the CrIS noise level (detectionlimit) the absolute differences between CrIS and the FTIR total columns showa slight positive column bias. The CrIS and FTIR profile comparisondifferences are mostly within the range of the single-level retrieved profilevalues from estimated retrieval uncertainties, showing averagedifferences in the range of  ∼ 20 to 40 %. The CrIS retrievalstypically show good vertical sensitivity down into the boundary layer whichtypically peaks at  ∼ 850 hPa (∼ 1.5 km). At thislevel the median absolute difference is 0.87 (std  =  ±0.08) ppb,corresponding to a median relative difference of 39 % (std  =  ±2 %).Most of the absolute and relative profile comparison differences arein the range of the estimated retrieval uncertainties. At the surface, whereCrIS typically has lower sensitivity, it tends to overestimate in low-concentration conditions and underestimate in higher atmospheric concentration conditions

Validation of the CrIS fast physical NH&lt;sub&gt;3&lt;/sub&gt; retrieval with ground-based FTIR

Validation of the CrIS fast physical NH<sub>3</sub> retrieval with ground-based FTIR