There are a few issues from the perspective of my pH experts, we will
put together a more detailed reply shortly. But two quick thoughts
until we can prepare that:
- The vague term violates the concept of consistent units, doesn't
it? pH_of_sea_water units require conversion depending on which
measurement technique they mean. I think a model that is so generic
perhaps is not really doing pH_of_sea_water, since the differences are
fundamental. (But I am not the expert)
- The interest in making things clear to the chemist seems to be at
the cost of making things straightforward to the people who work with
sea water pH. Given the prevalence of these terms in the broader
(e.g., Wikipedia) community, I'm not sure translating to chemistry is
a necessary step.
We will provide additional details shortly.
John
On Apr 30, 2009, at 7:50 AM, Lowry, Roy K wrote:
> Thanks Jonathan,
>
> Yes, OK.
>
> I guessed why you wanted the vaguer term!
>
> Cheers, Roy.
>
> -----Original Message-----
> From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu
> ] On Behalf Of Jonathan Gregory
> Sent: 30 April 2009 15:43
> To: cf-metadata at cgd.ucar.edu; Lowry, Roy K
> Subject: [CF-metadata] new standard name request for pH
>
> Dear Roy
>
> Thanks for clarification.
>
>> pH_of_sea_water_defined_by_mole_concentration_of_hydrogen_ion_per_unit_mass
>> (free scale)
>> pH_of_sea_water_defined_by_mole_concentration_of_hydrogen_ion_per_unit_volume
>> (NBS)
>
> In other standard names, "mole concentration" means mol m-3. So the
> second
> should be
>
>> pH_of_sea_water_defined_by_mole_concentration_of_hydrogen_ion (NBS)
>
> In existing names, we say "moles per unit mass" for mol kg-1. So the
> first is
>
>> pH_of_sea_water_defined_by_moles_of_hydrogen_ion_per_unit_mass
>> (free scale)
>
> OK?
>
> My main argument for plain pH_of_sea_water is that in many ocean
> models these
> two quantities would be identical.
>
> Cheers
>
> Jonathan
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John
--------------
John Graybeal <mailto:graybeal at mbari.org> -- 831-775-1956
Monterey Bay Aquarium Research Institute
Marine Metadata Interoperability Project:
http://marinemetadata.org
Received on Thu Apr 30 2009 - 09:12:13 BST
