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 <[email protected]>
*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. <[email protected]> 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 <[email protected]> on behalf of
Andrew Barna <[email protected]>
> 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 <[email protected]> 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 <[email protected]> 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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