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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-266
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-266
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 10 Jul 2019

Submitted as: research article | 10 Jul 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

TCCON and NDACC XCO measurements: difference, discussion and application

Minqiang Zhou1, Bavo Langerock1, Corinne Vigouroux1, Mahesh Kumar Sha1, Christian Hermans1, Jean-Marc Metzger2, Huilin Chen3, Michel Ramonet4, Rigel Kivi5, Pauli Heikkinen5, Dan Smale6, David F. Pollard6, Nicholas Jones7, Voltaire A. Velazco7, Omaira E. García8, Matthias Schneider9, Mathias Palm10, Thorsten Warneke10, and Martine De Mazière1 Minqiang Zhou et al.
  • 1Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 2UMS 3365 – OSU Réunion, Université de La Réunion, Saint-Denis, Réunion, France
  • 3Centre for Isotope Research (CIO), Energy and Sustainability Research Institute Groningen (ESRIG), University of Groningen (RUG), Groningen, the Netherlands
  • 4Laboratoire des Sciences du Climat et de l’Environnement (LSCE/IPSL), UMR CEA-CNRS-UVSQ, Gif-sur-Yvette, France
  • 5Finnish Meteorological Institute (FMI), Space and Earth Observation Centre, Sodankylä, Finland
  • 6National Institute of Water and Atmospheric Research (NIWA), Lauder, New Zealand
  • 7Centre for Atmospheric Chemistry, University of Wollongong, Wollongong, Australia
  • 8Izaña Atmospheric Research Centre (IARC), Meteorological State Agency of Spain (AEMET), Santa Cruz de Tenerife, Spain
  • 9Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research, Karlsruhe, Germany
  • 10Institute of Environmental Physics, University of Bremen, Bremen, Germany

Abstract. Column-averaged dry-air mole fraction of CO (XCO) measurements are obtained from two ground-based Fourier transform infrared (FTIR) spectrometers networks: the Total Carbon Column Observing Network (TCCON) and the Network for the Detection of Atmospheric Composition Change (NDACC). In this study, the differences between the TCCON and NDACC XCO measurements are investigated and discussed based on six NDACC/TCCON sites using data over the period 2007–2017. The NDACC XCO measurements are about 5.5 % larger than the TCCON data at Ny-Ålesund, Bremen, and Izaña (Northern Hemisphere), and about 0.3 % larger than the TCCON data at St Denis, Wollongong and Lauder (Southern Hemisphere). The hemispheric dependence of the bias is mainly attributed to their smoothing errors. The systematic smoothing error of the TCCON XCO data varies in the range between 0.2 % (Bremen) and 7.9 % (Lauder), and the random smoothing error in the range between 2.0 % and 3.6 %. The systematic smoothing error of NDACC data is between 0.1 % and 0.8 %, and the random smoothing error of NDACC data is about 0.3 %. For TCCON data, the smoothing error can be significant in that it is much higher than the reported uncertainty for TCCON XCO. To reduce the influence from the a priori profiles and different vertical sensitivities, the scaled NDACC a priori profiles are used as the common a priori profiles for comparing TCCON and NDACC retrievals. As a result, the biases between TCCON and NDACC XCO measurements become more consistent (5.6–8.5 %) with a mean value of 6.8 % at these sites. To understand the remaining bias, regular AirCore measurements at Orleans and Sodankylä are compared to co-located TCCON measurements. It is found that TCCON XCO measurements are 6.0 ± 1.9 % and 6.9  ± 2.5 % smaller than the AirCore measurements at Orleans and Sodankylä respectively, indicating that the scaling factor of TCCON XCO data should be around 1.0000 instead of 1.0672. Further investigations should be carried out in the TCCON community to determine the correct scaling factor to be applied to the TCCON XCO data. This paper also demonstrates that the smoothing error must be taken into account when comparing FTIR XCO data, and especially TCCON XCO data, with model or satellite data.

Minqiang Zhou et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Minqiang Zhou et al.
Minqiang Zhou et al.
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Short summary
The differences between the TCCON and NDACC XCO measurements are investigated and discussed based on six NDACC/TCCON sites (Ny-Ålesund, Bremen, Izaña, St Denis, Wollongong and Lauder) using data over the period 2007–2017. The smoothing errors from both TCCON and NDACC measurements are estimated. In addition, the scaling factor of the TCCON XCO data is re-assessed by comparing with the AirCore measurements at Sodankyla and Orleans.
The differences between the TCCON and NDACC XCO measurements are investigated and discussed...
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