Peau de l'océan

The parameterization of the ocean skin of Bellenger et al. (2017) can be activated by setting: activate_ocean_skin = 1 or 2 in physiq.def. The default value is 0 (parameterization not activated). If activate_ocean_skin = 1 then the parameterization is activated in diagnostic mode only: it has no retroaction on LMDZ. If activate_ocean_skin = 2 then the parameterization is activated with retroaction on LMDZ.

The variable flag_ocean_skin can be set in physiq.def. This variable is only read if activate_ocean_skin >= 1. flag_ocean_skin can be set to an integer value between 1 and 3, for cumulative effects cool skin, warm layer and fresh water lenses, in this order. The default value is 3.

The variable depth_1 can be set in physiq.def. This variable is only read if activate_ocean_skin >= 1. depth_1 should be set to a real positive value. It is the depth, in m, at which the temperature and salinity are input. It could be the depth at the middle of the first layer of an ocean model (half the depth of the first layer). Setting depth_1 to any value >= 3 has the same effect as setting depth_1 to 3. The default value is 20.

Some additional NetCDF variables can be output in history files when the parameterization is activated:

- ds_ns: subskin salinity minus foundation salinity, in ppt

- dt_ns: subskin temperature minus foundation temperature, in K

- s_int: interface salinity, in ppt

- t_int: interface temperature, in K

- dter: ocean-air interface temperature minus subskin temperature, in K

- dser: ocean-air interface salinity minus subskin salinity, in ppt

- tkt: thickness of cool skin (microlayer), in m

- tks: thickness of mass diffusion layer (microlayer), in m

- taur: momentum flux due to rain, in Pa

- delta_SST: ocean-air interface temperature minus bulk SST, in K

- delta_sal: ocean-air interface salinity minus bulk salinity, in ppt

- SSS: bulk sea-surface salinity, in ppt