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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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