HOWTO calculate Stream Function etc from U and V
(check out the UM wiki pages on sfvp too)
Jeff has a program that can do this!
It lives here:
/home/jeff/linux_x86_64/bin/sfvp_64bit_offset
This will print the help for sfvp:
These are the instructions for sfvp
Usage:
sfvp fn1 vn1 fn2 vn2 opfn
Description:
Calculates streamfunction and velocity potential
on the sphere, given inputs of the two velocity
components on the UM velocity grid
STOP
sfvp outputs:
- u
- v
- du/dx
- du/dy
- dv/dx
- dv/dy
- vorticity
- divergence
- stream function
- velocity potential
- tvor (?)
- tdiv (?)
Note
sfvp only really likes 4d files. To convert a 3d file to a 4d file (by inserting a dummy axis) use ~dan/idl/conv3d4d.pro
Note2
I've semi-automated the process of calculating seasonal_means and ensemble_mean_seasonal_means from the output of sfvp. The script that does this lives at /home/dan/data/UM_DATA/SFcalc
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