[ncl-talk] Polar stereographic plots of tripole grids

[Dennis Shea]

float siconc(time, lat, lon)
where lat(lat) and lon(lon) are coordinate variables.
There is no need to use @lat2d, @lon2d

The original file was renamed when I downloaded:

test.siconc_SIday_BCC-CSM2-MR.nc <==
siconc_SIday_BCC-CSM2-MR_historical_r1i1p1f1_gn_19000101-19091231.nc
===
Variable: sic
Type: float
Total Size: 121939200 bytes
            30484800 values
Number of Dimensions: 3
Dimensions and sizes: *[time | 365] x [lat | 232] x [lon | 360]*
Coordinates:
            time: [ 0.5..364.5]

*           lat: [-81.5..89.5]   <== coordinate variable            lon: [
0.5..359.5]  <== coordinate variable*
Number Of Attributes: 11
  standard_name : sea_ice_area_fraction
  long_name : Sea Ice Area Fraction (Ocean Grid)
  comment : Area fraction of grid cell covered by sea ice
  *units : %*
  original_name : CN
  cell_methods : area: mean where sea time: mean
  cell_measures : area: areacello
  history : 2018-11-27T09:03:20Z altered by CMOR: Treated scalar dimension:
'type'.
  coordinates : type latitude longitude
  missing_value : 1e+20
  _FillValue : 1e+20


See attached:

*%> ncl* siconc.ncl


On Wed, Sep 18, 2019 at 2:00 PM Abigail Smith via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi NCL-talk,
>
> I'm attempting to create polar stereographic contour plots of Arctic sea
> ice from various CMIP models on their native grids. Some of the grids are
> tripole, so I end up having the same gap as seen in ice_4.ncl at
> https://www.ncl.ucar.edu/Applications/orca.shtml. I want to remove the
> gap, but the solution in ice_4.ncl uses U-fold grid coordinates, which
> aren't provided for many CMIP models.
>
> I've attached an example script and the plot it produces. The data are
> available for download here:
>
> https://handle-esgf.dkrz.de/lp/21.14100/c55636b2-3c1a-4735-8243-4e62310acbc3
> I'm running ncl version 6.3.0 and not getting any error messages.
>
> Thanks in advance for considering this issue!
>
> Best,
> Abigail Smith
> University of Colorado Boulder
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