An intercomparison of total column-averaged nitrous oxide between ground-based FTIR TCCON and NDACC measurements at seven sites and comparisons with the GEOS-Chem model

Nitrous oxide (N2O) is an important greenhouse gas and it can also generate nitric oxide, which depletes ozone in the stratosphere. It is a common target species of ground-based Fourier transform infrared (FTIR) near-infrared (TCCON) and mid-infrared (NDACC) measurements. Both TCCON and NDACC networks provide a long-term global distribution of atmospheric N2O mole fraction. In this study, the dry-air column-averaged mole fractions of N2O (X-N2O) from the TCCON and NDACC measurements are compared against each other at seven sites around the world (Ny-Alesund, Sodankyla, Bremen, Izana, Reunion, Wollongong, Lauder) in the time period of 2007-2017. The mean differences in X-N2O between TCCON and NDACC (NDACC-TCCON) at these sites are between -3.32 and 1.37 ppb (-1.1 %-0.5 %) with standard deviations between 1.69 and 5.01 ppb (0.5 %-1.6 %), which are within the uncertainties of the two datasets. The NDACC N2O retrieval has good sensitivity throughout the troposphere and stratosphere, while the TCCON retrieval underestimates a deviation from the a priori in the troposphere and overestimates it in the stratosphere. As a result, the TCCON X-N2O measurement is strongly affected by its a priori profile.

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Related Dataset #1 : 2014 TCCON Data Release

Related Dataset #2 : Atmospheric Line List for the 2014 TCCON Data Release

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Author Zhou, Minqiang
Langerock, Bavo
Wells, Kelley C.
Millet, Dylan B.
Vigouroux, Corinne
Sha, Mahesh Kumar
Hermans, Christian
Metzger, Jean-Marc
Kivi, Rigel
Heikkinen, Pauli
Smale, Dan
Pollard, David F.
Jones, Nicholas
Deutscher, Nicholas M.
Blumenstock, Thomas
Schneider, Matthias
Palm, Mathias
Notholt, Justus
Hannigan, James W.
De Mazière, Martine
Publisher UCAR/NCAR - Library
Publication Date 2019-03-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Resource Version N/A
Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:22:44.035514
Metadata Record Identifier edu.ucar.opensky::articles:22357
Metadata Language eng; USA
Suggested Citation Zhou, Minqiang, Langerock, Bavo, Wells, Kelley C., Millet, Dylan B., Vigouroux, Corinne, Sha, Mahesh Kumar, Hermans, Christian, Metzger, Jean-Marc, Kivi, Rigel, Heikkinen, Pauli, Smale, Dan, Pollard, David F., Jones, Nicholas, Deutscher, Nicholas M., Blumenstock, Thomas, Schneider, Matthias, Palm, Mathias, Notholt, Justus, Hannigan, James W., De Mazière, Martine. (2019). An intercomparison of total column-averaged nitrous oxide between ground-based FTIR TCCON and NDACC measurements at seven sites and comparisons with the GEOS-Chem model. UCAR/NCAR - Library. Accessed 23 September 2023.

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