Dear Lars I think you have to put the operations in the order they are carried out: mean within years (to get monthly means), mean over years (to get climato- logical monthly means), range (to get climatological annual range). However, you can describe e.g. 30-year climatologies, as you would like, because the final time dimension can be bigger than one. The climatological time bounds for it will indicate the 30-year periods concerned.
This is a bit more complicated than the ticket as so far discussed because of combining multiple time processing with climatological time processing. The ticket went dormant because no-one had the impetus to conclude it. If you comment on it now with your new needs, the discussion could resume. Best wishes Jonathan ----- Forwarded message from Bärring Lars <[email protected]> ----- > Date: Mon, 16 May 2016 08:39:58 +0000 > From: Bärring Lars <[email protected]> > To: Jonathan Gregory <[email protected]>, "[email protected]" > <[email protected]> > Subject: RE: [CF-metadata] climatological statistics --- climate indices > > Dear Jonathan, > > Indeed, this looks like good solution. And to follow this line of thoughts to > its end; by shifting the order of the operations to > time: mean within years (period: 1 month) time: range time: mean over > years > it should be possible to have one file containing a series of successive 30 > year (say) averages of annual spans between monthly mean temperatures > > I note that ticket 82 has gone dormant since almost a year, there was not > much discussion and the comments were largely positive. Any chance that it > will be resurrected? > > > Many thank you for you constructive input. > > Lars > > > -----Original Message----- > From: CF-metadata [mailto:[email protected]] On Behalf Of > Jonathan Gregory > Sent: den 13 maj 2016 17:23 > To: [email protected] > Subject: Re: [CF-metadata] climatological statistics --- climate indices > > Dear Lars > > When you compute the third operation (the range over climatological months) > you collapse the time axis to size 1, so it no longer indicates that it was > months. It might previously have been days, 5-day periods, or anything else. > I think this case could be dealt with by the proposed (but not agreed) con- > vention for multiple processing of axes in cf-trac.llnl.gov/trac/ticket/82. > Something like > > time: mean within years (period: 1 month) time: mean over years time: range > > might work. > > Best wishes > > Jonathan > > ----- Forwarded message from Bärring Lars <[email protected]> ----- > > > Date: Fri, 13 May 2016 14:09:25 +0000 > > From: Bärring Lars <[email protected]> > > To: Jonathan Gregory <[email protected]>, "[email protected]" > > <[email protected]> > > Subject: RE: [CF-metadata] climatological statistics --- climate > > indices > > > > Dear Jonathan, > > > > > > But how about common continentality indices based on the annual range > > > > of monthly mean temperatures? > > > > Is there a "within months" such that the cell method for the basic > > > > element of the continentality index would be "time: mean within months > > > > time: range within years" ? Or is there another solution? > > > > > Climatological stats can be described for the annual cycle. The > > > climatological monthly mean temperature would be "time: mean within > > > years > > > time: mean over years", and you would use the climatological time bounds > > > to indicate the start and end of months (or other portions of the annual > > > cycle). > > > This would produce twelve climatological monthly values (for each > > > location). > > > Do you mean you then apply a third operation to compute the range of > > > these twelve values? > > > > Yes, exactly. > > > > And, just to complete the picture, possibly even a to apply fourth > > operation to calculate a climatological average over e.g. 30 years. In > > practice, this is of course much simplified if one uses monthly mean > > temperature data as input because the operations that is actually performed > > would be described by the cell method "time: range within years time: mean > > over years". But this would be an incomplete description of the data. > > > > Kind regards, > > > > Lars > > > > > > > > ----- End forwarded message ----- > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ----- End forwarded message ----- _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
