It looks sensible to me, too, but I have to ask a stupid question. Of all the data with "sea_water_pressure" CF standard names in the world, how many are actually presenting what CF defines that to be? (If the answer is "very few", maybe the answer is that the definition is just mis-stated for what the community expected, and we need a new term to go with the existing definition.)
(Yes, this is a perspective that only an ontologist could offer without embarrassment.)
John
On Jan 10, 2013, at 15:16, Cameron-smith, Philip wrote:
> Hi Roy,
>
> This looks sensible to me.
>
> Philip
>
> -----------------------------------------------------------------------
> Dr Philip Cameron-Smith, pjc at llnl.gov, Lawrence Livermore National Lab.
> -----------------------------------------------------------------------
>
>
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Lowry, Roy K.
> Sent: Thursday, January 10, 2013 1:01 AM
> To: cf-metadata at cgd.ucar.edu
> Cc: sdn2-netcdf at seadatanet.org
> Subject: [CF-metadata] sea_water_pressure
>
> Dear All,
>
> It has been pointed out to me that the SeaDataNet NetCDF specification uses 'sea_water_pressure' as the Standard Name in cases where pressure is used as the z co-ordinate in observational data such as CTD profiles. The definition for this Standard Name is:
>
> the pressure that exists in the medium of sea water. It includes the pressure due to overlying sea water, sea ice, air and any other medium that may be present.
>
> Consequently the expected pressure z co-ordinate labelled 'sea_water_pressure' would be approximately 10 decibars at the sea surface. However, it is almost universal practice to either calibrate or correct the pressure z co-ordinate so that it reads zero at the sea surface. Consequently, I think we need a new Standard Name:
>
> sea_water_pressure_due_to_sea_water defined as
>
> the pressure that exists in the medium of sea water due to overlying sea water. Excludes the pressure due to sea ice, air and any other medium that may be present.
>
> Apologies to anybody else who like me had used 'sea_water_pressure' for their Z co-ordinate without looking at the definition.
>
> Cheers, Roy.
>
> Please note that I now work part-time from Tuesday to Thursday. E-mail response on other days is possible but not guaranteed!
>
>
>
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----------------
John Graybeal <mailto:jgraybeal at ucsd.edu> phone: 858-534-2162
Product Manager
Ocean Observatories Initiative Cyberinfrastructure Project:
http://ci.oceanobservatories.org
Marine Metadata Interoperability Project:
http://marinemetadata.org
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