Karl,
As a scientist, you should use "pascal". I note that one
microatmosphere is about one tenth of one pascal.
"microatm" mixes a word (micro) with a symbol (atm). In general, this
is not a good idea. The official guidelines from the NIST recommend
against it, for example, and so do I (for whatever that's worth :-).
If you must use atmospheres, then a better alternative would be
"microatmosphere".
Regardless, the UDUNITS-2 package does recognize "microatm" (ugly,
deformed hybrid that it is :-).
Regards,
Steve Emmerson
On 3/26/2010 10:32 AM, Karl Taylor wrote:
Hi all,
Should I use microatm instead of uatm for a pressure unit in the CMIP5
requested output list? Apparently this is the preferred unit for partial
pressure of CO2 in seawater.
Will the latest versions of udunits recognize it?
thanks for any guidance,
Karl
On 26-Mar-10 8:52 AM, Andrew Clegg wrote:
Hi Julien,
I'm glad you brought this up. We had a discussion about this recently
(look for any threads with 'udunits 1 or 2 for CF' in the title):
http://*mailman.cgd.ucar.edu/pipermail/cf-metadata/2010/thread.html
The best solution (in my opinion) was to use expanded names rather
than shortened, so instead of using 'u' (which has been replaced by
'ยต' in udunits2) you would use 'micro' (which is compatible with
both). However it would be nice to get a consensus on this or another
solution, and some text added to the conventions.
Cheers,
Andrew Clegg
Julien Demaria wrote:
Hi,
I found the "u" micro prefix abbreviation in the current CF-1.4
documentation on units:
http://*cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#units
but it seems this prefix is not available in the last udunits-2
(udunits-1 is now deprecated)
and in udunits-2 they break backward compatibility because the "u"
symbol is now used for a new unit "unified_atomic_mass_unit", see in
http://*www.*unidata.ucar.edu/software/udunits/udunits-2/udunits2-accepted.xml
http://*www.*unidata.ucar.edu/software/udunits/udunits-2/udunits2-prefixes.xml
So what is the position of the CF community concerning this point, is
the "u" micro prefix CF-1.4 compliant or not?
Thanks in advance,
Julien
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