Add ISSM fields to HISTORY and initialization arguments

[agstub]

The purpose of this Draft PR is to add two new variables from ISSM (Ice-Sheet and Sea-Level System Model) to HISTORY. The variables are ICESMB (ice surface mass balance: exported from LandIce GridComp) and ICEEL (ice surface elevation: exported from ISSM GridComp).

• Development by @weiyuan-jiang for outputting these variables with HISTORY on a tile space that corresponds to the (unstructured, triangular) elements of ISSM's mesh. Feature/jiang/issm gridcomp GEOSgcm_GridComp#1209
• added new collection tavg24_1d_issm_Nt (Tile-space,Daily,Time-Averaged,Single-level,ISSM Diagnostics) for mesh tile space: 81842f0
• The PR also adds configuration parameters to GEOSldas_LDAS.rc that are required by ISSM for initialization: ISSM_EXPDIR and ISSM_EXPNAME. ISSM_EXPDIR points to the directory containing the ISSM input file, which will be replaced by a restart directory in the future. ISSM_EXPNAME is the name of the binary input file (ISSM_EXPNAME.bin) and PETSc options file (ISSM_EXPNAME.toolkits).

Related issues and PRs

• Original issue: GEOSldas+ISSM on Discover GEOSldas#853
• Add ISSM components to LDAS fixture GEOSldas#854
• Add ISSM ice sheet model GridComp to Landice GEOSgcm_GridComp#1203

TO DO:

• Add default ISSM outputs ICETHICK (ice thickness) and ICEVEL (ice-flow speed). This will require changes to ISSM branch, GEOSgcm_GridComp branch, module update (env), and history update in this branch.

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[weiyuan-jiang]

The variables in the same collection should have the same tile or gridded space. We have discussion that ISSM should have output in mesh-like space. So ICEEL should not be in this collection

[agstub]

The variables in the same collection should have the same tile or gridded space. We have discussion that ISSM should have output in mesh-like space. So ICEEL should not be in this collection

That makes sense! Should I make new collections for ISSM outputs (mesh tile collection and gridded collection)? Will we still want to save a gridded version of ice elevation @lcandre2 ?

[lcandre2]

The variables in the same collection should have the same tile or gridded space. We have discussion that ISSM should have output in mesh-like space. So ICEEL should not be in this collection

That makes sense! Should I make new collections for ISSM outputs (mesh tile collection and gridded collection)? Will we still want to save a gridded version of ice elevation @lcandre2 ?

I would say that for standard ISSM outputs (elevation, ice velocity, ice discharge, perhaps a few others) it would be good to have both a tile and gridded collection.