Hi again,
I place great weight on the phrase 'where appropriate'. If a model works out electrical conductivity and then uses the PSS-78 algorithms to compute the salinity then using 'practical salinity' would be appropriate, but these are far from the norm!!! It's observational measurements where we really need to be careful about the types of salinity, but I've yet to see a measurements data set where bottom salinities are tagged differently from the salinities measured elsewhere in the water column. Consequently I don't see the need for the new name.
Cheers, Roy.
I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address.
________________________________
From: Andrew Barna <abarna at ucsd.edu>
Sent: 10 September 2019 18:47
To: Lowry, Roy K. <rkl at bodc.ac.uk>
Cc: Cathy Smith <cathy.smith at noaa.gov>; CF Metadata List <cf-metadata at cgd.ucar.edu>
Subject: Re: [CF-metadata] new variable name request
Thanks Roy,
All the existing ?sea_water_salinity? names have the sentence "The more precise standard names should be used where appropriate for both modelled and observed salinities.? So it think it was worth the ask if they know.
-Barna
> On 2019-09-10, at 07:42, Lowry, Roy K. <rkl at bodc.ac.uk> wrote:
>
> Dear Barna,
>
> Perhaps the existing Standard Name would suffice for Cathy's needs as she is labelling model output and the models in my experience do not work to a specific measurement scale. This is because boundary condition and assimilation data sets can include measurements of more than one type in order to provide adequate coverage.
>
> Cheers, Roy.
>
> I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address.
>
> From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Andrew Barna <abarna at ucsd.edu>
> Sent: 10 September 2019 18:23
> To: Cathy Smith <cathy.smith at noaa.gov>
> Cc: CF Metadata List <cf-metadata at cgd.ucar.edu>
> Subject: Re: [CF-metadata] new variable name request
>
> Hi Cathy,
>
> There is already the name `sea_water_salinity_at_sea_floor` in the CF standard name list. However, if you know the scale you are calculating, a new name should be added to indicate this:
> sea_water_practical_salinity_at_sea_floor if using PSS-78
> or
> sea_water_absolute_salinity_at_sea_floor if using TEOS-10
>
> I can come up with some definitions if you would like to have either of these proposed to the list.
> -Barna
>
>
> > On 2019-09-10, at 07:04, Cathy Smith <cathy.smith at noaa.gov> wrote:
> >
> > Thanks. I will use that variable.
> >
> > I also calculated salinity of the ocean floor. Same question.
> >
> > Cathy
> >
> > On 9/9/19 3:44 PM, Andrew Barna wrote:
> >> Hi Cathy,
> >>
> >> There is the name `sea_water_potential_temperature_at_sea_floor` with the following definition:
> >> Potential temperature is the temperature a parcel of air or sea water would have if moved adiabatically to sea level pressure. The potential temperature at the sea floor is that adjacent to the ocean bottom, which would be the deepest grid cell in an ocean model.
> >>
> >> From what I can tell, there is no ?in situ? sea water temperature name at the sea floor. I?d suggest the following name for this parameter with canonical units K:
> >> `sea_water_temperature_at_sea_floor`
> >>
> >> Here is a possible definition basically modifying the above to remove the ?potential? parts:
> >>
> >> Sea water temperature is the in situ temperature of the sea water. The temperature at the sea floor is that adjacent to the ocean bottom, which would be the deepest grid cell in an ocean model.
> >>
> >> There should probably also be a modification of the existing sea_water_temperature definition to include this new name if it is accepted:
> >>
> >> The sentence:
> >> "There are standard names for sea_surface_temperature, sea_surface_skin_temperature, sea_surface_subskin_temperature and sea_surface_foundation_temperature which can be used to describe data located at the specified surfaces.?
> >>
> >> Should be changed to:
> >>
> >> "There are standard names for sea_surface_temperature, sea_surface_skin_temperature, sea_surface_subskin_temperature, sea_surface_foundation_temperature, and sea_water_temperature_at_sea_floor which can be used to describe data located at the specified surfaces.?
> >>
> >> -Barna
> >>
> >>> On 2019-09-09, at 11:23, Cathy Smith <cathy.smith at noaa.gov> wrote:
> >>>
> >>> All
> >>>
> >>> I have a new variable request; bottom temperature. It is the temperature of the ocean floor (or the last level of a multi level ocean dataset). I searched and was unable to find it or a variable with "bottom" or synomyn as a level. I welcome being pointed out where I missed it.
> >>>
> >>> It is an important variable for fish and aquatic populations near coasts (or very shallow oceans).
> >>>
> >>> http://glossary.ametsoc.org/wiki/Bottom_temperature
> >>>
> >>> https://www.frontiersin.org/articles/10.3389/fmars.2019.00030/full
> >>>
> >>> Let me know if this request should go elsewhere.
> >>>
> >>> Thanks
> >>>
> >>> Cathy Smith
> >>>
> >>> ----------------------------------------------
> >>> NOAA/ESRL PSD and CU CIRES
> >>> 303-497-6263
> >>> https://www.esrl.noaa.gov/psd/people/cathy.smith/
> >>>
> >>> Emails about data/webpages may get quicker responses from emailing
> >>> esrl.psd.data at noaa.gov
> >>>
> >>> _______________________________________________
> >>> CF-metadata mailing list
> >>> CF-metadata at cgd.ucar.edu
> >>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >
> > --
> > ----------------------------------------------
> > NOAA/ESRL PSD and CU CIRES
> > 303-497-6263
> > https://www.esrl.noaa.gov/psd/people/cathy.smith/
> >
> > Emails about data/webpages may get quicker responses from emailing
> > esrl.psd.data at noaa.gov
> >
>
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