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Discussion papers
https://doi.org/10.5194/acp-2019-821
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-821
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 08 Oct 2019

Submitted as: research article | 08 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Evaluation of the CAMS global atmospheric trace gas reanalysis 2003–2016 using aircraft campaign observations

Yuting Wang1,a,*, Yong-Feng Ma2,*, Henk Eskes3, Antje Inness4, Johannes Flemming4, and Guy P. Brasseur1,5 Yuting Wang et al.
  • 1Max Planck Institute for Meteorology, Hamburg, 20146, Germany
  • 2Institute of Geophysics, faculty of Physics, University of Warsaw, Poland
  • 3Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
  • 4ECMWF, Shinfield Park, Reading, RG2 9AX, UK
  • 5National Center for Atmospheric Research, Boulder, CO, USA
  • anow at: Department of Civil and Environmental Engineering, the Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
  • *These authors contributed equally to this work.

Abstract. The Copernicus Atmosphere Monitoring Service (CAMS) operated by the European Centre for Medium Range Weather Forecasts (ECMWF) has produced a global reanalysis of aerosol and reactive gases (called CAMSRA) for the period 2003–2016. Space observations of ozone, carbon monoxide, NO2 and aerosol optical depth are assimilated by a 4-D Var method in the 60-layer ECMWF global atmospheric model, which for the reanalysis is operated at a horizontal resolution of about 80 km. As a contribution to the evaluation of the reanalysis, we compare atmospheric concentrations of different reactive species provided by the CAMS reanalysis with independent observational data gathered by airborne instrumentation during the field campaigns INTEX-A, INTEX-B, NEAQS-ITCT, ITOP, AMMA, ARCTAS, VOCALS, YAK-AEROSIB, HIPPO and KORUS-AQ. We show that the reanalysis reproduces rather successfully the observed concentrations of chemical species that are assimilated in the system including O3 and CO with the biases generally less than 20 %, but generally underestimate the concentrations of the primary hydrocarbons and secondary organic species. In some cases, large discrepancies also exist for fast-reacting radicals such as OH and HO2.

Yuting Wang et al.
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Short summary
The paper presents an evaluation of the CAMS global reanalysis of reactive gases performed for the period 2003–2016. The evaluation is performed by comparing concentrations of chemical species gathered during airborne field campaigns with calculated values. The reanalysis reproduces successfully the observed concentrations of ozone and carbon monoxide but generally underestimates the abundance of hydrocarbons. Large discrepancies exist for fast-reacting radicals such as OH and HO2.
The paper presents an evaluation of the CAMS global reanalysis of reactive gases performed for...
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