Page Comparison

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SE =  Atmosphere spectral element dycore mesh ( CAM-SE Grid Overview ). Usually in "np4" configuration where each element has a 4x4 array of GLL nodes.   

FV =  MPAS finite volume mesh or, for the v2 trigrid setups, the FV r05 and r0125 land and river runoff grids, and SE atmosphere "physgrids"  pg2 and pg3 options.     

Grid description/tempalte files: 

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UPDATE 2020/2/21:  Removing highorder maps which can have negative weights.  It's probably a bad idea to use negative weights in a coupled simulation, and we shouldn't recommend this without detailed evaluation.        

Recommended Settings:   For ATM SE grids with physics on the "np4" grid (used in V1), coupled to FV ocean and FV land

1. SE → FV  for fluxes:  use "mono" 
2. SE → FV for state variables:  "highorder". ). not recommended.  
3. SE → FV for state variables:  intbilin?
4. FV → SE for fluxes:  monotr
   1. The best map is the transpose of the SE->FV map computed above:
   2. This is the most important map, as it is used to compute the domain files and defines the ocean/land mask on the atm/land grid.  
5. FV → SE for state variables and velocity:  highorder.   not recommended.  
   1. Tests with ocean120→NE30, analytic fields, show this map is more accurate than the transpose map. 
6. FV → SE mono.  
   1. This is also a good monotone/conservative map for fluxes, but not quite as accurate (in analytic tests) as the transpose map recommended above.  
7. FV → SE for state variables
   1. ocn→atm: currently this map must be the same as used for fluxes.     
   2. lnd→atm:   if land grid resolution >> atmosphere resolution:  "mono"  
   3. lnd→atm:   if land grid resolution <= atmosphere resolution:   ESMF's bilin.  
   4. DESIRED:  a version of intbilin for FV source grids.   

Recommended Settings:   For ATM FV grids (with physics on the

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"pg2"

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grid, used in V2)  coupled to FV ocean and FV land

1. fluxes:  mono
2. state variables:
   1. ocn→atm: currently this map must be the same as used for fluxes.     
   2. lnd↔atm and atm→ocn
      1. if source grid resolution >> target grid resolution:  "mono"  
      2. source grid resolution <= target grid resoluiton:  ESMF's bilin
   3. DESIRED:  a version of intbilin for FV source grids. 

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