[ncl-talk] Problems plotting CICE grid

[Anne]

Hello,
I have the problem that I can perfectly plot *tice* from CICE output (based
on *aice,* I have used one of the special ncl scripts for this purpose),
but not anymore after I detrended it (dtrend; along with it using both
*copy_VarMeta* and *copy_VarCoord* of the original in order to keep the
metadata). The plot (attached) looks distorted.


I think the error is in the *lat2d* and *lon2d*, when doing printVarSummary:

Variable: *tice*
Type: float
Total Size: 846028800 bytes
            211507200 values
Number of Dimensions: 3
Dimensions and sizes: [time | 144] x [y | 1020] x [x | 1440]
Coordinates:
            time: [727779..736325]
Number Of Attributes: 8
  long_name : ice area  (aggregate)
  units : %
  coordinates : TLON TLAT
  _FillValue : 1e+30
  missing_value : 1e+30
  comment : none
  cell_methods : time: mean
  time_rep : averaged

and printVarSummary od *var_dtrend:*

Variable: *var_dtrend*
Type: float
Total Size: 846028800 bytes
            211507200 values
Number of Dimensions: 3
Dimensions and sizes: [144] x [1020] x [1440]
Coordinates:
Number Of Attributes: 10
  missing_value : 1e+30
*  lat2d : <ARRAY of 1468800 elements>*
*  lon2d : <ARRAY of 1468800 elements>*
  long_name : ice area  (aggregate)
  units : %
  coordinates : TLON TLAT
  comment : none
  cell_methods : time: mean
  time_rep : averaged
  _FillValue : 1e+30

lat2d and lon2d are extra listed here again, and I don't know why. I have
also tried to add
var_dtrend at lon2d = tlon2d
var_dtrend at lat2d = tlat2d

but this didn't solve the issue. I also attached the script.

Is the simplest thing just to interpolate it anyway?

Thanks, any help appreciated!
Anne

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