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Re: symmetric anomalies?
Haldor,
You can reverse the Y axis on a variable with the SAMPLEJ external
function available in Ferret 5.x. Use the same technique with SAMPLEI
to reverse the X axis.
yes? use coads_climatology
yes? show data
currently SET data sets:
1> /opt/local/ferret/fer_dsets/descr/coads_climatology.des
(default)
name title I J
K L
SST SEA SURFACE TEMPERATURE 1:180 1:90 ...
1:12
AIRT AIR TEMPERATURE 1:180 1:90 ...
1:12
SPEH SPECIFIC HUMIDITY 1:180 1:90 ...
1:12
WSPD WIND SPEED 1:180 1:90 ...
1:12
UWND ZONAL WIND 1:180 1:90 ...
1:12
VWND MERIDIONAL WIND 1:180 1:90 ...
1:12
SLP SEA LEVEL PRESSURE 1:180 1:90 ...
1:12
yes? ! Here we define an index which samples from hi to lo along J
yes? let reverse_j = 90 - j[g=sst]
yes? let sst_reverse_j = samplej(sst,reverse_j)
yes? shade/j=45:90/l=1/lev=20c sst-sst_reverse_j
*** NOTE: Ambiguous coordinates on Y axis: SST-SST_REVERSE_J
-- Jonathan Callahan
Halldor Bjornsson wrote:
>
> Hi,
>
> Does anyone know how to tell ferret to generate "symmetry anomaly fields"?
>
>
> An example would be the following:
>
> Given SST field extending
> from 60S to 60N, plot SSTANO, which is defined as difference
> between the north and the south hemispheres (the line of symmetry
> being the equator):
>
> SSTANO = SST(from 60S to 60N) - SST(from 60N to 60S)
>
> Its important to note that Lat S should map to the same Lat N,
> (i.e give difference between 50S and 50N, etc.)
>
> Likewise one could generate an anomaly plot where the line
> of symmetry is a given longitude and w'ed get an east-west
> anomaly field.
>
> If anyone has ideas on how to do this please share them with me, -
> I'm kindoffa stuck here...
>
> Thanks
>
> Halldor
> --
> -----------------------------------------------
> Halldor Bjornsson
> Program in Atmosphere and Ocean Science &
> Geophysical Fluid Dynamics Laboratory
> Princeton University, Princeton, NJ USA
> email: hnb@gfdl.gov
> -----------------------------------------------
>
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