I am asked to check which vertical co-ordinate system(z*,sigma,hybrid) represents best vertical structure of Indian Ocean. I am supposed to create a grid for Indian Ocean region with all these 3 vertical system in MOM6. I am not getting any clue from the examples. Can anyone help me???
MOM6 vertical structure
- Thread starter prasanna
- Start date
I suggest you try the 75 level hybrid coordinate in ice_ocean_SIS2/OM4_025. It uses the densities from the file hycom1_75_800m.nc, and a in-code function for the z* part of the column. We have no software for generating the density profiles - it turns out to be a hard problem. If you want to change the number of levels, you'll have to fiddle around with the numbers - we did it by hand.
For a z* coordinate, change
The above are the settings we used in https://doi.org/10.1029/2019MS001726 .
I don't recommend sigma coordinates with real topography, mostly because of unbounded topographic slopes, but also because we have not tried/tested it.
For a z* coordinate, change
Code:
ALE_COORDINATE_CONFIG = "FNC1:2,6500,6,.01" ! default = "UNIFORM"
! FNC1:string - FNC1:dz_min,H_total,power,precisionThe above are the settings we used in https://doi.org/10.1029/2019MS001726 .
I don't recommend sigma coordinates with real topography, mostly because of unbounded topographic slopes, but also because we have not tried/tested it.
kshedstrom@alaska_edu
Member
Is the file: hycom1_75_800m.nc available online somewhere? It's not in the OM4_025.tgz file, though that experiment uses it.
kshedstrom@alaska_edu
Member
Never mind, Rob found it for me: https://noaa-ufs-regtests-pds.s3.amazonaws.com/input-data-20221101/MOM6_FIX/050/hycom1_75_800m.nc
It's also in the experiment repo at MOM6-examples/hycom1_75_800m.nc at dev/gfdl · NOAA-GFDL/MOM6-examples