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Discussion papers
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 19 Nov 2018

Research article | 19 Nov 2018

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

The CAMS reanalysis of atmospheric composition

Antje Inness1, Melanie Ades1, Anna Agusti-Panareda1, Jérôme Barré1, Anna Benedictow2, Anne-Marlene Blechschmidt3, Juan Jose Dominguez1, Richard Engelen1, Henk Eskes4, Johannes Flemming1, Vincent Huijnen4, Luke Jones1, Zak Kipling1, Sebastien Massart1, Mark Parrington1, Vincent-Henri Peuch1, Miha Razinger1, Samuel Remy5, Michael Schulz2, and Martin Suttie1 Antje Inness et al.
  • 1ECMWF, Shinfield Park, Reading, RG2 9AX, UK
  • 2Norwegian Meteorological Institute Postboks 43 Blindern, 0313 Oslo, Norway
  • 3Institute of Environmental Physics, University of Bremen, Germany
  • 4Royal Netherlands Meteorological Institute, De Bilt, The Netherlands
  • 5IPSL, CNRS/UPMC, Paris, France

Abstract. The Copernicus Atmosphere Monitoring Service (CAMS) reanalysis is the latest global reanalysis data set of atmospheric composition produced by the European Centre for Medium-Range Weather Forecasts (ECMWF), consisting of 3-dimensional time-consistent atmospheric composition fields, including aerosols and chemical species. The dataset currently covers the period 2003–2016 and will be extended in the future by adding one year each year. A reanalysis for greenhouse gases is being produced separately. The CAMS reanalysis builds on the experience gained during the production of the earlier Monitoring Atmospheric Composition and Climate (MACC) reanalysis and CAMS interim reanalysis. Satellite retrievals of total column CO, tropospheric column NO2, aerosol optical depth and total column, partial column and profile ozone retrievals were assimilated for the CAMS reanalysis with ECMWF’s Integrated Forecasting System. The new reanalysis has an increased horizontal resolution of about 80 km and provides more chemical species at a better temporal resolution (3-hourly analysis fields, 3-hourly forecast fields and hourly surface forecast fields) than the previously produced CAMS interim reanalysis. The CAMS reanalysis has smaller biases compared to independent ozone, carbon monoxide, nitrogen dioxide and aerosol optical depth observations than the previous two reanalyses and is much improved and more consistent in time, especially compared to the MACC reanalysis. The CAMS reanalysis is a dataset that can be used to compute climatologies, study trends, evaluate models, benchmark other reanalyses or serve as boundary conditions for regional models for past periods.

Antje Inness et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Antje Inness et al.
Antje Inness et al.
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Publications Copernicus
Short summary
This paper describes a new dataset of atmospheric composition data for the years 2003–2016 that has been produced by the Copernicus Atmosphere Monitoring service (CAMS). It is called the `CAMS reanalysis' and provides information on aerosols and reactive gases. The CAMS reanalysis shows an improved performance compared to our previous atmospheric composition reanalyses, has smaller biases compared to independent O3, CO, NO2 and aerosol observations and is more consistent in time.
This paper describes a new dataset of atmospheric composition data for the years 2003–2016 that...