EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Recent updates to the atmospheric chemistry modeling of the ECMWF IFS in support to CAMS

Vincent Huijnen1, Jason Williams1, Idir Bouarar2, Sophie Belamari3, Simon Chabrillat4, Samuel Remy5, and Johannes Flemming6
Vincent Huijnen et al.
  • 1KNMI, De Bilt, The Netherlands (
  • 2MPI-Meteorology, Hamburg, Germany
  • 3Meteo-France, Toulouse, France
  • 4BIRA-IASB, Brussels, Belgium
  • 5HYGEOS, Lille, France
  • 6ECMWF, Reading, UK

The Integrated Forecasting System (IFS) of ECMWF is the core of the Copernicus Atmosphere Monitoring Service (CAMS) which provides global analyses and forecasts of atmospheric composition, namely reactive gases, aerosol and greenhouse gases. With respect to the atmospheric chemistry component, the operational system currently relies on a modified version of the CB05 chemistry scheme for the troposphere, combined with the Cariolle scheme to describe stratospheric ozone. In an alternative, more recent configuration also stratospheric ozone chemistry is included based on the BASCOE chemistry module. Alternative atmospheric chemistry modules which can be employed are based on MOZART and MOCAGE chemistry. 
Recently, further revisions to the modified CB05 tropospheric chemistry scheme have been developed, focusing both on inorganic and organic chemistry, with the aim of improving the quality of existing air-quality products, and the development of new products. On major update is a revision of the isoprene oxidation scheme based on those employed in existing chemistry transport models, as well as inclusion of the basic chemistry describing C8 and C9 aromatics degradation. 
An example of a new product derived from these updates include a description of global distribution of glyoxal, while this also resulted in an improved modeling of OH recycling particularly over tropical forests. Also we support improved secondary organic aerosol formation due to gaseous anthropogenic, biogenic and biomass burning sources.
In this contribution we provide an overview of these revisions, and provide a first quantification of their uncertainties, by comparing products to observations and to those from alternative chemistry modules.

How to cite: Huijnen, V., Williams, J., Bouarar, I., Belamari, S., Chabrillat, S., Remy, S., and Flemming, J.: Recent updates to the atmospheric chemistry modeling of the ECMWF IFS in support to CAMS, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2481,, 2021.


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