[gradsusr] converting GRIB to .dat for FORTRAN

[Stephan Steyn]

Dear GrADS users

As described on https://ds.data.jma.go.jp/tcc/tcc/library/MRCS_SV12/sstdata/readme_grib_e.htm I am attempting to use a GrADS script to convert  a GRIB file (in the form of ERA5 gridded surface data) to a .dat file that I can read with FORTRAN (4-byte real floating point format). I already have fortran programs that can ingest this format.

I managed to use "grib2ctl.pl" to create the .ctl file (copied below) and "gribmap" to create a .grib.idx file and successfully display the data in GrADS.
Upon executing "run convert.gs" (copied below) within GrADS I don't receive any error messages, only to find that the .dat file was never created. I also tried to make subsets of the data with the same non-result.

I am using GrADS Version 2.0.2 run on 64-bit Fedora in a Oracle Virtualbox on Lenovo Thinkpad (Core i7).

I am pretty much stuck now... Please help!

Stephan

*** convert.gs ***
*---------------------------------------------------------------------
function main()
* Please edit the following line to match your computer environment:
mydir='/home/stephan/ERA5'
'open ERA5_sfcvar12_197901.ctl'
'set lon 0.00 359.75'
'set lat -90.00 90.00'
'set time jan1979'
'set gxout fwrite'
'set fwrite 'mydir'/ERA5_sfcvar12_197901.dat'
'quit'
*----------------------------------------------------------------------

Below the content of "ERA_sfcvar12_197901.ctl": -----------------------
dset ^ERA5_sfcvar12_197901.grib
index ^ERA5_sfcvar12_197901.grib.idx
undef 9.999E+20
title ERA5_sfcvar12_197901.grib
*  produced by grib2ctl v0.9.15
* command line options: ERA5_sfcvar12_197901.grib
dtype grib 255
options yrev
ydef 721 linear -90.000000 0.25
xdef 1440 linear 0.000000 0.250000
tdef 31 linear 12Z01jan1979 1dy
zdef 1 linear 1 1
vars 4
no10Usfc  0 165,1,0  ** surface 10 metre U wind component [m s**-1]
no10Vsfc  0 166,1,0  ** surface 10 metre V wind component [m s**-1]
no2Dsfc  0 168,1,0  ** surface 2 metre dewpoint temperature [K]
no2Tsfc  0 167,1,0  ** surface 2 metre temperature [K]
ENDVARS

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