Added frazil to ice shelf#985
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I am convinced that this code is correct as written, and should correctly address the issue of how to handle the frazil heat fluxes under ice shelves.
At a later date, we may need to revisit how frazil is handled when there is partial coverage of the ocean by ice shelves, especially when that coverage is evolving with time.
The frazil mass flux to the ice-shelf base is calculated by multiplying frazil energy [J m-2] by the inverse of the timestep times the latent heat of fusion [kg J-1 s-1]. This frazil mass flux is incorporated as a negative water flux from the ice shelf. This negative water flux then acts to add the frazil mass to the ice shelf base (MOM_ice_shelf.F90/change_thickness_using_melt) and remove it from the ocean surface as evaporation (MOM_ice_shelf.F90/add_shelf_flux). Note frazil is reset to zero at the start of each therm timestep in MOM.F90/step_MOM. Some additional changes were also made to how the ice-shelf flux factor is implemented, so that is only scales ice-shelf melt without affecting the frazil mass flux.
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This PR has passed pipeline testing at https://gitlab.gfdl.noaa.gov/ogrp/mom6ci/MOM6/-/pipelines/29405. |
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The frazil mass flux to the ice-shelf base is calculated by multiplying frazil energy [J m-2] by the inverse of the timestep times the latent heat of fusion [kg J-1 s-1].
This frazil mass flux is incorporated as a negative water flux from the ice shelf, which then acts to add the frazil mass to the ice shelf base
(MOM_ice_shelf.F90/change_thickness_using_melt) and remove it from the ocean surface as evaporation (MOM_ice_shelf.F90/add_shelf_flux).
Note frazil is reset to zero at the start of each therm timestep in MOM.F90/step_MOM.
Some additional changes were also made to how the ice-shelf flux factor is implemented, so that is only scales ice-shelf melt without affecting the frazil mass flux.