Conversion of the CLUSE Model for Applications over Open Ocean: Progress Report
2006
Van Eijk, A. M. | Mestayer, P. G. | De Leeuw, G.
The CLUSE model has been developed to describe the dynamics of (fresh water) spray droplets in the homogeneous boundary layer of an air-sea interaction simulation tunnel, and their influence on humidity and temperature profiles. Extension to open ocean conditions requires that the fresh water droplets are replaced by sea-salt aerosol, and that the influence of waves is taken into account. In this report we describe the progress on the development of the SeaCluse model that applies to open ocean conditions. The calculation of the profiles of the mean wind velocity and turbulent diffusivity has been changed to take into account the characteristics of the marine atmosphere and of the wave field. A module was added to the initialization routines that models the air flow over the waves in a non-turbulent and non-evaporative atmosphere. This module yields vertical profiles of droplet concentrations that enter in the relaxation term that models the mean movement of the particles. These profiles are then modified in the iterative budget calculation that accounts for droplet transport by atmospheric turbulence and their interaction with the humidity field by evaporation. In this part of the code, the evaporation module was changed to describe the evaporation of sea salt aerosols in the marine atmosphere. The output of the new SeaCluse model consists of vertical profiles of temperature, humidity and aerosol concentration from the sea surface up to the top of the marine atmospheric boundary layer.
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