Dear All,
The proposed name sea_water_temperature_at_sea_floor has been added to the latest version of the standard name table.
As discussed, we already have a standard name for sea_water_salinity_at_sea_floor.
There seems to be some support for also adding sea_water_practical_salinity_at_sea_floor (canonical units: 1) for use with observational datasets. Based on existing names the definition for this would be as follows:
'The salinity at the sea floor is that adjacent to the ocean bottom, which would be the deepest grid cell in an ocean model. Practical Salinity, S_P, is a determination of the salinity of sea water, based on its electrical conductance. The measured conductance, corrected for temperature and pressure, is compared to the conductance of a standard potassium chloride solution, producing a value on the Practical Salinity Scale of 1978 (PSS-78). This name should not be used to describe salinity observations made before 1978, or ones not based on conductance measurements. Conversion of Practical Salinity to other precisely defined salinity measures should use the appropriate formulas specified by TEOS-10. Other standard names for precisely defined salinity quantities are sea_water_absolute_salinity (S_A); sea_water_preformed_salinity (S_*), sea_water_reference_salinity (S_R); sea_water_cox_salinity (S_C), used for salinity observations between 1967 and 1977; and sea_water_knudsen_salinity (S_K), used for salinity o
bservations between 1901 and 1966. Salinity quantities that do not match any of the precise definitions should be given the more general standard name of sea_water_salinity. Reference: www.teos-10.org; Lewis, 1980 doi:10.1109/JOE.1980.1145448.'
Is this okay? If so, it can be added in the October standard names update.
Best wishes,
Alison
-----------------------------------------------------------------------------------------------------------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Analysis Email: mailto:alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> On Behalf Of Lowry, Roy K.
Sent: 12 September 2019 19:59
To: cf-metadata at cgd.ucar.edu; ngalbraith at whoi.edu
Subject: Re: [CF-metadata] new variable name request
PS I was already totally happy with adding sea_water_temperature_at_sea_floor
I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address.
________________________________________
From: CF-metadata on behalf of Nan Galbraith
Sent: 12 September 2019 17:13
To: mailto:cf-metadata at cgd.ucar.edu
Cc: OceanSITES Data Management Team
Subject: Re: [CF-metadata] new variable name request
Hi all -
I'd like to second (or third ... ) the request for new standard names for
sea_water_practical_salinity_at_sea_floor and
sea_water_temperature_at_sea_floor.
In the OceanSITES project, we deploy CTDs on mooring anchors, and it
would be good
to be able to find these records, among all the water temperature and
practical salinity
data sets on our servers. We supply a measurement depth, but it isn't
useful for this
search, since the water depth isn't mandatory in our format spec.
These records are not exactly on the sea floor, but within a few meters;
do we need to
apply some limit to the distance? I'm thinking about the various
sea_surface_temperature
variants, surface_skin and surface_subskin, but I'm assuming this isn't
needed for sea
floor measurements.
Thanks - Nan
On 9/10/19 1:59 PM, Lowry, Roy K. wrote:
> 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
> *Sent:* 10 September 2019 18:47
> *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. 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.
> >
> >
> > From: CF-metadata on behalf of
> Andrew Barna
> > Sent: 10 September 2019 18:23
> > 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 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 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
> > >>>
>
>
--
*******************************************************
* Nan Galbraith Information Systems Specialist *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 (508) 289-2444 *
*******************************************************
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Received on Wed Sep 25 2019 - 10:09:35 BST
