Precipitation and Evaporation Temperature

If your simulation includes temperature variations, you need to specify how the temperature should change due to precipitation and evaporation. There are three different ways to do this:

·         If the Heat Exchange module is selected, you can select the for­mat "Heat exchange module". In this case, the effect of precipita­tion/evaporation on the water temperature is as obtained through the latent heat flux.

·         You may choose the format "Ambient water temperature", in which case the temperature of the precipitated/evaporated water mass is set equl to the temperature of the ambient sea water.

·         You may specify the value of the temperature in the precipitated/evapo­rated water mass through the formats "Constant value", "Type 0 data file" or "Type 2 data file".

If you have chosen the net-precipitation option, then the selected format for "Precipitation temperature" will be used when the specified net-precipitation is positive and that for "Evaporation temperature" when it is negative. The exception is, that with the "Heat exchange module" format the precipita­tion/evaporation temperature is always obtained from the latent heat flux regardless of the sign of the specified net-precipitation.

If Heat Exchange is selected, the effect on water temperature from latent heat flux is always included. If you do not want this contribution, then you can turn it off by assigning zero for the value of both coefficients, a₁ and b₁, in Dalton's law, see Vaporisation