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This article clarifies an issue some of our users have experienced with the use of CAMS global sea salt aerosol mixing ratios. The current package of the global CAMS C-IFS model (Morcrette et al., 2009), which was developed during the course of the GEMS and MACC projects, mainly follows the aerosol treatment of the LOA/LMD-Z model (Boucher et al. 2002; Reddy et al. 2005). Prognostic aerosols of sea salt are described using three size bins. For sea-salt, radius bin limits are at 0.03, 0.5, 5 and 20 microns. As described in Reddy et al. (2005), sea salt emissions as well as sea salt particle radii are expressed at 80% relative humidity. This is different from all the other aerosol species in C-IFS, which are expressed as dry mixing ratios (0% relative humidity).

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  • Boucher, O., M. Pham, and C. Venkataraman, 2002: Simulation of the atmospheric sulfur cycle in the LMD GCM: Model description, model evaluation, and global and European budgets, Note 23, 26 pp., Inst. Pierre-Simon Laplace, Paris, France. (Available at https://cmc.ipsl.fr/images/publications/scientific_notes/note23.pdf)
  • Morcrette, J.-J., and Coauthors, 2009: Aerosol analysis and forecast in the ECMWF Integrated Forecast System. Part I: Forward modelling, J. Geophys. Res., 114D, D06206, https://doi.org/10.1029/2008JD011235.
  • Reddy, M. S., O. Boucher, N. Bellouin, M. Schulz, Y. Balkanski, J.-L. Dufresne and M. Pham, 2005: Estimates of global multi-component aerosol optical depth and direct radiative perturbation in the Laboratoire de Météorologie Dynamique general circulation model, J. Geophys. Res., 110, D10S16, https://doi.org/10.1029/2004JD004757.
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This document has been produced in the context of theCopernicus

Atmosphere

Atmosphere Monitoring Service (CAMS).

The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.

The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view.

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