Preprints
https://doi.org/10.5194/gmd-2021-264
https://doi.org/10.5194/gmd-2021-264

Submitted as: model description paper 14 Sep 2021

Submitted as: model description paper | 14 Sep 2021

Review status: this preprint is currently under review for the journal GMD.

Description and evaluation of the tropospheric aerosol scheme in the Integrated Forecasting System (IFS-AER, cycle 47R1) of ECMWF

Samuel Rémy1, Zak Kipling2, Vincent Huijnen3, Johannes Flemming2, Pierre Nabat4, Martine Michou4, Melanie Ades2, Richard Engelen2, and Vincent-Henri Peuch2 Samuel Rémy et al.
  • 1HYGEOS, Lille, France
  • 2European Centre for Medium Range Weather Forecasts, Reading, UK
  • 3Royal Netherlands Meteorological Institute, De Bilt, Netherlands
  • 4Météo-France, Toulouse, France

Abstract. This article describes the IFS-AER aerosol scheme used operationally in the Integrated Forecasting System (IFS) cycle 47R1, operated by the European Centre for Medium Range Weather Forecasts (ECMWF) in the framework of the Copernicus Atmosphere Monitoring Services (CAMS). It represents an update of the Rémy et al. (2019) article which focused on cycle 45R1 of IFS-AER. The parameterizations of sources and sinks that have been updated since cycle 45R1 are described, as well as changes in the configuration used operationally within CAMS. As compared to cycle 45R1, a greater integration of aerosol and chemistry has been achieved. Primary aerosol sources have been updated, with the implementation of new dust and seasalt aerosol emission schemes. New dry and wet deposition parameterizations have also been implemented. Sulfate production rates are now provided by the global chemistry component of the IFS. This paper aims to describe most of the updates that have been implemented since cycle 45R1 and not only the ones that are used operationally in cycle 47R1; components that are not used operationally will be clearly flagged.

Cycle 47R1 of IFS-AER has been evaluated against a wide range surface and total column observations. The final simulated products such as Particulate Matter (PM) and Aerosol Optical Depth (AOD) generally show a significant increase in skill as compared to results obtained with cycle 45R1. Similarly, the simulated surface concentration of sulphate, organic matter and sea-salt aerosol is improved by cycle 47R1 as compared to cycle 45R1. Some imbalances persist, such as a too high surface concentration of nitrate and organic matter. The new wet and dry deposition schemes that have been implemented into cycle 47R1 have a mostly positive impact on simulated AOD, PM and speciated aerosol surface concentration.

Samuel Rémy et al.

Status: open (until 09 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Samuel Rémy et al.

Samuel Rémy et al.

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Short summary
This article describes a new version of IFS-AER, the tropospheric aerosol scheme that is used to provide global aerosol products within the Copernicus Atmosphere Monitoring Service (CAMS). Several components of the model have been updated such as the dynamical dust and sea-salt aerosol emission schemes. New deposition schemes have also been incorporated, but are not yet used operationally. This new version of IFS-AER have been evaluated and shown to have a greater skill than previous versions.