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 than shortened, so instead of using 'u' (which has been replaced by
>> '?' 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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>>> CF-metadata at cgd.ucar.edu
>>> http://*mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
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Received on Fri Mar 26 2010 - 11:09:31 GMT
