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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-142
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-142
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 13 Jun 2019

Model description paper | 13 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Description and evaluation of the tropospheric aerosol scheme in the Integrated Forecasting System (IFS-AER, cycle 45R1) of ECMWF

Samuel Rémy1, Zak Kipling2, Johannes Flemming2, Olivier Boucher1, Pierre Nabat4, Martine Michou4, Alessio Bozzo2,a, Melanie Ades2, Vincent Huijnen3, Angela Benedetti2, Richard Engelen2, Vincent-Henri Peuch2, and Jean-Jacques Morcrette2 Samuel Rémy et al.
  • 1Institut Pierre-Simon Laplace, Sorbonne Université/CNRS, Paris, France
  • 2European Centre for Medium Range Weather Forecasts, Reading, UK
  • 3Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
  • 4Météo-France, Toulouse, France
  • anow at: European Organisation for the Exploitation of Meteorological Satellites, Darmstadt, Germany

Abstract. This article describes the IFS-AER aerosol module used operationally in the Integrated Forecasting System (IFS) cycle 45R1, operated by the European Centre for Medium RangeWeather Forecasts (ECMWF) in the framework of the Copernicus Atmospheric Monitoring Services (CAMS). We describe the different parameterizations for aerosol sources, sinks and its chemical production in IFS-AER, as well as how the aerosols are integrated in the larger atmospheric composition forecasting system. The focus is on the entire 45R1 code-base, including some components that are not used operationally, in which case this will be clearly specified. This paper is an update to the Morcrette et al. (2009) article that described aerosol forecasts at ECMWF, using the cycle 32R2 of the IFS. Between cycles 32R2 and 45R1, a number of source and sink processes have been reviewed and/or added, increasing notably the complexity of IFS-AER. A greater integration with the tropospheric chemistry scheme of the IFS has been achieved, for the sulphur cycle as well as for nitrate production. Two new species, nitrate and ammonium, have also been included in the forecasting system. Global budgets and aerosol optical depth (AOD) fields are shown, as well as an evaluation of the simulated Particulate Matter (PM) and AOD against observations, showing an increase in skill from cycle 40R2, used in the CAMS interim Reanalysis (CAMSiRA), to cycle 45R1.

Samuel Rémy et al.
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This article describes the IFS-AER aerosol module used operationally in the Integrated Forecasting System (IFS) cycle 45R1, operated by ECMWF in the framework of the Copernicus Atmospheric Monitoring Services (CAMS). We describe the different parameterizations for aerosol sources, sinks, as well as how the aerosols are integrated in the larger atmospheric composition forecasting system. The skill of PM and AOD simulations against observations is improved as compared to the older cycle 40R2.
This article describes the IFS-AER aerosol module used operationally in the Integrated...
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