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. 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 (calledCAMSRA) for the period 2003–2016. Space observations of ozone, carbonmonoxide, NO2 and aerosol optical depth are assimilated by a 4D-Varmethod in the 60-layer ECMWF global atmospheric model, which for thereanalysis is operated at a horizontal resolution of about 80 km. As acontribution to the evaluation of the reanalysis, we compare atmosphericconcentrations of different reactive species provided by the CAMS reanalysiswith independent observational data gathered by airborne instrumentationduring the field campaigns INTEX-A, INTEX-B, NEAQS-ITCT, ITOP, AMMA, ARCTAS,VOCALS, YAK-AEROSIB, HIPPO and KORUS-AQ. We show that the reanalysisrather successfully reproduces the observed concentrations of chemicalspecies that are assimilated in the system, including O3 and CO withbiases generally less than 20 %, but generally underestimates theconcentrations of the primary hydrocarbons and secondary organic species. Insome cases, large discrepancies also exist for fast-reacting radicals suchas OH and HO2.

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