CDO

Hi Mubashar,

Try the undocumented CDO operator duplicate to duplicate a file. Use the optional parameter to set the number of duplicates. Here is an example for 120 duplicates:

cdo duplicate,120 ifile ofile

cdo settaxis,<startdate>,0,1mo -duplicate,120 ifile ofile

Cheers,
Uwe

Dear Uwe,

The duplicate and settaxis command works perfectly fine. Before applying the duplicate & settaxis command for duplicating I applied time average command on my input data (having julinan calender) to get time average as follows:

cdo timmean asmsw.nc_jan1990_dec1999.nc timmean.nc

Warning (cdfInqContents) : calendar >julian< unsupported!
cdo timmean: Processed 7840800 values from 18 variables over 121 timesteps. ( 0.39s )

What about julian calender warning message?

2ndly my original input file shows pressure coordinate in ncdump as as follows:

float pfull(pfull) ;
pfull:positive = "up" ;
pfull:long_name = "pressure" ;
pfull:units = "hPa" ;

while cdo shows ncdump of timemean.nc as:

float pfull(pfull) ;
pfull:standard_name = "air_pressure" ;
pfull:long_name = "pressure" ;
pfull:units = "hPa" ;
pfull:positive = "down" ;
pfull:axis = "Z" ;

Please notice the difference of positive = "down" and positive = "up".

Can I somehow get the same pressure convention. I know the data represents perfectly fine but have opposite display in GrADS.

Thanks,

Mubashar

CDO doesn't support a pure Julian calendar. In this case a standard mixed Gregorian/Julian calendar as defined by Udunits is used. I think the result should be ok, if the reference date/time is near to the time offset.

Hi,

One thing I forgot to mention is that I want julian calendar (as is in my original input file) instead of standard calendar. How can we specify this?

Thanks,

Mubashar