Bryan:
Jonathan Gregory has been offering suggestions and help off list for a
suite of new standard_names I would like to propose. Jonathan pointed
out that the sign convention is specified in the standard_name, so use
of the "positive" attribute is not needed.
Thanks!
Forrest
Bryan Lawrence wrote:
> Hi Forrest
>
> Are some of these going to be implicit in the standard name? (I imagine no
> always, so I can see the sense of the argument). Personally I don't have a
> problem with introducing an extended controlled vocabulary into the positive
> argument.
>
> Cheers
> Bryan
>
> On Tuesday 26 June 2007 15:03:31 Forrest Hoffman wrote:
>
>> Much of the CF-1.0 convention seems to be atmospherically biased. I
>> know that's because it is the atmospheric scientists that pioneered all
>> these developments. In attempting to adopt this methodology for other
>> components of Earth System Models, I'm concluding it may be necessary to
>> extend the convention to adequately support the needs of these components.
>>
>> For example, it appears to me that the "positive" attribute for CF-1.0
>> variables is really used to describe vertical directionality. This
>> attribute is often traditionally associated with atmospheric radiation
>> variables. In CMOR, the only valid attribute values are "up" and "down."
>>
>> In terrestrial biogeochemistry various sign conventions exist, and I had
>> hoped to use the "positive" attribute to describe the desired convention
>> where vertical directionality is not important or known. The values I
>> had initially hoped to use for the "positive" attribute for some
>> biogeochemistry variables were "into biosphere" and "out of biosphere"
>> and "into pool" and "out of pool."
>>
>> It would seem that "vertical-directionality" would be a more appropriate
>> attribute where the "positive" attribute has been traditionally
>> applied. I'm sure nobody wants to change this now, but I'm looking for
>> suggestions for attributes that might describe sign conventions where
>> directionality is either not vertical or is more conceptually abstract.
>> We could establish a "negative" attribute, but users might expect some
>> kind of correspondence with the "positive" attribute. A
>> "sign-convention" attribute might work, but it might have many possible
>> values. Any other suggestions?
>>
>> Forrest
>>
>
>
--
Forrest Hoffman mailto:forrest at climatemodeling.org
Oak Ridge National Laboratory mailto:forrest at computer.org
Climate & Carbon Research Institute http://www.climatemodeling.org/~forrest
Computer Science & Mathematics Div. (865) 576-7680 voice
Building 5600, Room C221, MS 6016 (865) 576-5491 fax
P.O. Box 2008 Deliveries: Bethel Valley Road
Oak Ridge TN 37831-6016 35? 55' 23" N 84? 19' 20" W
"The ability to speak doesn't Check out ORNL's
make you intelligent." Climate & Carbon Research Institute
-- Qui-Gon Jinn at http://www.ccs.ornl.gov/CCR/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20070628/8cb179ae/attachment-0002.html>
Received on Thu Jun 28 2007 - 07:45:11 BST
