Dear Roy,
Thank you for your proposal for the 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.'
I assume that the canonical unit for this quantity should be dbar, as is the case for existing sea_water_pressure names.
Thank you to Philip and John for their comments in this thread.
I think we should add a cross-reference to sea_water_pressure in the definition of the proposed name: 'For sea water pressure including the pressure due to overlying media other than sea water, the standard name sea_water_pressure should be used.'
Similarly, we should add a cross-reference to the definition of sea_water_pressure: 'For sea water pressure excluding the pressure due to overlying media other than sea water, the standard name sea_water_pressure_due_to_sea_water should be used.'
With these additions the proposed name is accepted for inclusion in the standard name table and will be added at the next update.
Best wishes,
Alison
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Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Lowry, Roy K.
Sent: 10 January 2013 09:01
To: cf-metadata at cgd.ucar.edu
Cc: sdn2-netcdf at seadatanet.org
Subject: [CF-metadata] sea_water_pressure
Dear All,
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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:
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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.
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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:
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sea_water_pressure_due_to_sea_water defined as
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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.
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Apologies to anybody else who like me had used 'sea_water_pressure' for their Z co-ordinate without looking at the definition.
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Cheers, Roy.
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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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Received on Mon Feb 11 2013 - 07:32:31 GMT
