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NCL Scripts to Regrid NCEP/NCAR Reanalysis Data for Comparison with CCR GCM Output
These scripts allow the user to regrid (interpolate) NCEP/NCAR Reanalysis
Data to the CCM1 (R15), CCM3 (T42), Genesis (T31, 2x2), and FOAM (R15)
grids so that GCM output may be compared with NCEP/NCAR Reanalysis Data.
There are several versions of these scripts because the NCEP/NCAR Data
is on two grids: a fixed
grid (2.5x2.5 degrees with 73x144 points) and a gaussian
grid (T62 with 94x192 points). You will need to check your data (do
a "ncdump -h") for its dimensions so that you know what type of grid
it is on.
Contents
Use function f2gsh(grid : numeric, outdims[2]
: integer, twave[1] : integer)
- grid: input array of 2 or more dimensions (last two dimensions
must be nlata x nlona, values must be in ascending latitude
order)
- outdims: indicates dimensions of rightmost two dimensions of output
grid (outdims[0] = nlatb, outdims[1] = nlonb)
- wave: scalar integer indicating the optional wave truncation:
- twave = 0 => exact interpolation
- twave > 0 => exact interpolation and triangular truncation at
twave
- twave < 0 => exact interpolation, triangular truncation at
twave and spectral coefficient tapering (the effect is to smooth
the data)
Scripts
Use function g2gsh(grid : numeric, outdims[2]
: integer, twave[1] : integer)
- grid: input array of 2 or more dimensions (last two dimensions
must be nlata x nlona, values must be in ascending latitude
order)
- outdims: indicates dimensions of rightmost two dimensions of output
grid (outdims[0] = nlatb, outdims[1] = nlonb)
- wave: scalar integer indicating the optional wave truncation:
- twave = 0 => exact interpolation
- twave > 0 => exact interpolation and triangular truncation at twave
- twave < 0 => exact interpolation, triangular truncation at
twave and spectral coefficient tapering (the effect is to smooth
the data)
Scripts
- ncep_gaussian_to_CCM1.ncl
- ncep_gaussian_to_CCM3.ncl
- ncep_gaussian_to_genagcm.ncl
- ncep_gaussian_to_foam.ncl
(latent heat flux example)
