# Changeset 12772 for NEMO/branches/2020/ticket_2444/doc/latex/NEMO/subfiles/chap_SBC.tex

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Timestamp:
2020-04-17T18:32:46+02:00 (9 months ago)
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#2444: changes requested by Dave

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• ## NEMO/branches/2020/ticket_2444/doc/latex/NEMO/subfiles/chap_SBC.tex

 r12769 \np{ln_isfcav_mlt}{ln\_isfcav\_mlt}\forcode{ = .true.} activates the ocean/ice shelf thermodynamics interactions at the ice shelf/ocean interface. If \np{ln_isfcav_mlt}\forcode{ = .false.}, thermodynamics interactions are desctivated but the ocean dynamics inside the cavity is still active. The logical flag \np{ln_isfcav}{ln\_isfcav} control wether or not the ice shelf cavities are closed. \np{ln_isfcav}{ln\_isfcav} is not defined in the namelist but in the domcfg.nc input file.\\ The logical flag \np{ln_isfcav}{ln\_isfcav} control whether or not the ice shelf cavities are closed. \np{ln_isfcav}{ln\_isfcav} is not defined in the namelist but in the domcfg.nc input file.\\ 3 options are available to represent to ice-shelf/ocean fluxes at the interface: where $T_b$ is the temperature at the interface, $S_b$ the salinity at the interface, $\gamma_T$ and $\gamma_S$ the exchange coefficients for temperature and salt, respectively, $S_i$ the salinity of the ice (assumedto be 0), $h_{isf}$ the ice shelf thickness, $\rho_i$ the density of the iceshelf, $S_i$ the salinity of the ice (assumed to be 0), $h_{isf}$ the ice shelf thickness, $\rho_i$ the density of the iceshelf, $c_{p,i}$ the specific heat capacity of the ice, $\kappa$ the thermal diffusivity of the ice and $T_s$ the atmospheric surface temperature (at the ice/air interface, assumed to be -20C). The fluxes and friction velocity are computed using the mean temperature, salinity and velocity in the first \np{rn_htbl}{rn\_htbl} m. Then, the fluxes are spread over the same thickness (ie over one or several cells). If \np{rn_htbl}{rn\_htbl} larger than top $e_{3}t$, there is no more direct feedback between the freezing point at the interface and the top cell temperature. If \np{rn_htbl}{rn\_htbl} is larger than top $e_{3}t$, there is no more direct feedback between the freezing point at the interface and the top cell temperature. This can lead to super-cool temperature in the top cell under melting condition. If \np{rn_htbl}{rn\_htbl} smaller than top $e_{3}t$, the top boundary layer thickness is set to the top cell thickness.\\ \caption[Ice shelf location and fresh water flux definition]{ Illustration of the location where the fwf is injected and whether or not the fwf is interactif or not.} whether or not the fwf is interactive or not.} \label{fig:ISF} \end{figure} \item[Step 2]: a new domcfg.nc file is built using the DOMAINcfg tools. \item[Step 3]: NEMO run for a specific period and output the average melt rate over the period. \item[Step 4]: the ice sheet model run using the melt rate outputed in step 4. \item[Step 4]: the ice sheet model run using the melt rate outputed in step 3. \item[Step 5]: go back to 1. \end{description}
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