[ncl-talk] NCL to replace CDO

[Marston Johnston]

Hi,

 

For years I’ve been using CDO to convert ECMWF’s IFS grib files to netcdf and converting it from reduced Gaussian grid to regular lat lon.

But CDO has not kept up the pace with updates and they do not respond to many questions.

Therefore, I’m attempting to move this part of my processing chain to NCL.

I’m using NCL 6.5 (beta) to read the grib file (see attached log file). There 1 or 2 problems and then I have a question.

 

1.)     My NCL script is not finding the experimental variables in the grib file. These variables are given the generic names varXXX where XXX can be between 88 and 111, for example.

2.)     The script also doesn’t find the 3D records. I’m not sure how NCL finds these records in the grib file and then lists them as a 3D (time,lev,lat,lon), not counting the time. 

3.)     If 1 and 2 can be resolved, how can I then convert the reduced Gaussian grid to regular lat lon? Would ESMF work if I setup a regular lat lon grid?

 

Appreciate your thoughts on this.

/M

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Johnston, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

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