Hi all,
Very new to Ferret and I need some help.
Here is my data:
yes? show data sstaC.nc
currently SET data sets:
2> ./sstaC.nc (default)
name title I J K L
SST 1:64 1:56 1:12 ...
I = Longitude
J = Latitude (~3.21° grids)
K = Time (months)
I have a sea surface temperature (SST) grid that I want to alter. I want to do three things:
1.
Reduce SST north of 40N by 1.6 °C
2.
Reduce SST between 40S-40N by 0.7 °C
3.
Reduce SST south of 40S by 2.0 °C
For each of these operations I don’t want my temperature to go below -1.65C, and so I have been using the
MAX function…
(i.e.,
let sstSOUTH=max(sst[J=1:15S]-2, -1.65)
let sstMID=max(sst[J=16:41]-0.7, -1.65)
let sstNORTH=max(sst[J=42:56]-1.6, -1.65) )
This works fine. I am able to produce three separate variables: sstSOUTH, sstMID, sstNORTH. Each are modified as I like.
However, I do not know how to combine these together into the one .nc file and therefore recreate the world grid of sea surface temperatures.
I have been using:
save/file=ZC_sstemp5d.nc sstSOUTH, sstMID, sstNORTH
And the datafile looks like this:
yes? show data
currently SET data sets:
1> ./ZC_sstemp5d.nc (default)
name title I J K L
SSTS MAX(SST[J=1:15]-2,-1.65) 1:64 1:15 1:12 ...
SSTM MAX(SST[J=16:41]-0.7,-1.65) 1:64 1:26 1:12 ...
SSTN MAX(SST[J=42:56]-1.6,-1.65) 1:64 1:15 1:12 ...
Any advice would really really be appreciated. I’m sure it’s only a simple few commands that I’m missing.
Thanks to all,
Pearse J. Buchanan
PhD Candidate / CSIRO-UTAS Quantitative Marine Science
Institute for Marine and Antarctic Studies (IMAS)
University of Tasmania
M +61 458701672
imas.utas.edu.au
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