Validation of the CrIS fast physical NH.sub.3 retrieval with ground-based FTIR

Presented here is the validation of the CrIS (Cross-track Infrared Sounder) fast physical NH.sub.3 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 D...

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Bibliographic Details
Published in:Atmospheric measurement techniques 2017-07, Vol.10 (7), p.2645
Main Authors: Dammers, Enrico, Shephard, Mark W, Palm, Mathias, Cady-Pereira, Karen, Capps, Shannon, Lutsch, Erik, Strong, Kim, Hannigan, James W, Ortega, Ivan, Toon, Geoffrey C, Stremme, Wolfgang, Grutter, Michel, Jones, Nicholas, Smale, Dan, Siemons, Jacob, Hrpcek, Kevin, Tremblay, Denis, Schaap, Martijn, Notholt, Justus, Erisman, Jan Willem
Format: Article
Language:English
Subjects:
Atmospheric composition
Fourier transform infrared spectroscopy
Measurement
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Summary:Presented here is the validation of the CrIS (Cross-track Infrared Sounder) fast physical NH.sub.3 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 × 10.sup.16 molecules cm.sup.-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 (
ISSN:1867-1381
1867-8548