[gradsusr] Relative topography RT1000-500 hPa

[Djordje Romanic]

Dear GrADS Userds,

Using NCEP/NCAR 6-hours data from the
http://nomad3.ncep.noaa.gov:9090/dods/reanalyses/reanalysis-1/6hr/pgb/pgb.info
I
need to calculate the relative topography RT1000-500 hPa, i.e. difference
between geopotential height of 500 hPa pressure level and 1000 hPa pressure
level, for a 30-years period (1961-1990) and for the whole globe. Please,
does anyone can help me how to do it with GrADS and how to write the result
in a file?

Thanks in advance.

Kind regards,

Djordje
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