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Tools for DisplacedPole Ocean Grid Generation for CCSM2

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... independent variable (sets the order of the ... to extend the grid into the polar continents without wasting resolution, ... Runoff-to-Ocean Map with Smoothing ... – PowerPoint PPT presentation

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Title: Tools for DisplacedPole Ocean Grid Generation for CCSM2


1
Tools for Displaced-Pole Ocean Grid Generation
for CCSM2
  • Steve Yeager Rick Smith
  • Esther Brady John Davis

2
What needs to be modified?
  • OCN
  • horiz_grid ieee r8, ulat,ulng,htn,hte,hus,huw,u
    tan
  • topography ieee i4, kmt
  • region_mask ieee i4 regionmask
  • other input_template files…
  • CPL
  • map_ATM_to_OCN_aave.nc
  • map_ATM_to_OCN_bilin.nc
  • map_OCN_to_ATM_aave.nc
  • map_RUNOFF_to_OCN.nc

3
Tools
4
1. a. Generating a Grid
  • ns_dipole generates a dipole mesh grid with
    user-specified north/south pole locations.
  • Equator is always a grid line
  • Enhanced meridional resolution at the equator
  • Code tries to make aspect ratio ? 1
  • Nx is independent variable (sets the order of the
    resolution) Ny requires iteration

Created using display_hgrid (R Smith et al)
5
1. b. Generating a kmt
  • paleotopo assigns topography/kmt to a grid based
    on a paleo bathymetry dataset in netcdf format.
  • topography assigns topography/kmt to a grid
    based on the 1/12 degree etopo5 dataset.

Created using display_hgrid_land
6
  • Iterate grid/kmt generation until
  • … for a given Nx and equatorial gaussian
    function, Ny is sufficient to extend the grid
    into the polar continents without wasting
    resolution,
  • … grid has acceptable min/max cell sides aspect
    ratios for active ocean points (when compared to
    standard grids)

7
(No Transcript)
8
1. c. Hand Edit Kmt
  • eCubed enables interactive grid-viewing/kmt-editi
    ng using a mouse keyboard
  • Reads/writes a grid netcdf file created with
    grid_bin2nc
  • Convert kmt back into POP input binary with
    gridkmt_nc2bin

Created using display_hgrid_land
Created using eCubed
9
2. a. Maps between ATM OCN
  • mk_remap.csh creates atmosphere?ocean mappings
    using SCRIP (Spherical Coordinate Remapping and
    Interpolation Package) developed by Phil Jones.

10
2. b. Mapping Runoff to OCN
  • mk_runoff_remap.csh calls SCRIP generates a
    conservative runoff?ocean mapping netcdf.
  • BUT, it does not guarantee global water
    conservation
  • ALSO, it may require additional smoothing to
    prevent excessively low ocean salinities in high
    runoff regions.
  • Use map_runoff/.F90 for
  • runoff map conservation correction
  • map matrix testing
  • ocean smoothing map generation testing
  • map matrix multiplication.

11
Why are conservation corrections needed?
  • Potential flux loss
  • …where an active source grid cell does not
    overlap any (a) or only partially overlaps (b) a
    destination cell.
  • …where an active source grid cell maps into an
    inactive destination cell (c)
  • runoff_conserve_mod.F90 applies corrections

12
Runoff Smoothing
  • runoff_smooth_mod.F90 contains routines for
    generating an ocean-to-ocean smoothing map
  • Input parameters maxradius (km) efold (km)
  • test_smooth generates netcdf output of smoothing
    effects for select source points

efold 100km, maxradius 500km
13
Runoff-to-Ocean Map with Smoothing
  • runoff_map_mod.F90 contains routines for matrix
    multiplication testing

runoff grid
ocean grid
runoff grid

ocean grid
ocean grid
ocean grid
Final Map
Smoothing Map
Corrected SCRIP Map
14

efold 100km, maxradius 500km
efold 2000km, maxradius 500km
15
Surface Salinity Effect of Smoothing Runoff
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