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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 2 | Copyright
Atmos. Meas. Tech., 9, 577-585, 2016
https://doi.org/10.5194/amt-9-577-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Feb 2016

Research article | 22 Feb 2016

Retrieval of xCO2 from ground-based mid-infrared (NDACC) solar absorption spectra and comparison to TCCON

Matthias Buschmann1, Nicholas M. Deutscher1,2, Vanessa Sherlock3, Mathias Palm1, Thorsten Warneke1, and Justus Notholt1 Matthias Buschmann et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 2School of Chemistry, University of Wollongong, Wollongong, NSW, Australia
  • 3Department of Atmospheric Research, National Institute of Water and Atmospheric Research (NIWA) Ltd., Wellington, New Zealand

Abstract. High-resolution solar absorption spectra, taken within the Network for the Detection of Atmospheric Composition Change Infrared Working Group (NDACC-IRWG) in the mid-infrared spectral region, are used to infer partial or total column abundances of many gases. In this paper we present the retrieval of a column-averaged mole fraction of carbon dioxide from NDACC-IRWG spectra taken with a Fourier transform infrared (FTIR) spectrometer at the site in Ny-Ålesund, Spitsbergen. The retrieved time series is compared to colocated standard TCCON (Total Carbon Column Observing Network) measurements of column-averaged dry-air mole fractions of CO2 (denoted by xCO2). Comparing the NDACC and TCCON retrievals, we find that the sensitivity of the NDACC retrieval is lower in the troposphere (by a factor of 2) and higher in the stratosphere, compared to TCCON. Thus, the NDACC retrieval is less sensitive to tropospheric changes (e.g., the seasonal cycle) in the column average.

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The column-averaged dry-air mole fraction of CO2 has been retrieved from high-resolution solar absorption spectra from two different measurement networks. We investigate the differences between these retrievals and find that their sensitivity differs greatly. As a result the direct comparison of the two retrievals remains challenging.
The column-averaged dry-air mole fraction of CO2 has been retrieved from high-resolution solar...
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