Adding seaice thickness data from HYCOM for use in LSM sea ice module #1067
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This PR adds modifications to the code so that sea ice thickness information from HYCOM can be used in the LSM sea ice module. If no sea ice depth information is available, the default depth of 3m is used which can be unrealistically high in certain areas.
Sea ice depth data from HYCOM can be downloaded from https://ncss.hycom.org/thredds/ncss/grid/GLBy0.08/expt_93.0/ice/dataset.html (choose the "sih" variable). These data have to be written to WPS intermediate format with file prefix "ICET" and the name of the variable which is read in is called "ICETHICK".
To activate, users need to explicitly set icedepth_external=.true. in the physics section of namelist.atmosphere.