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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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