Dear Nan, Rich, Rich, John, Roy, All,
This is great! Thank you all for spending the time to get the definition right for this important quantity.
I know that Nan is keen we reach a conclusion: it seems we are just about there, and I hope the care and attention this name has received will mean that we can now settle it for a long time to come. Looking back, I see that psu has been the topic of sporadic discussion since at least 2006 so it really is good news that we at last seem to have reached an authoritative and well documented agreement.
So, to summarize the state of play, I think we have now agreed on:
sea_water_practical_salinity (canonical units: 1)
'Practical Salinity 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; sea_water_cox_salinity (S_C), used for salinity observations between 1967 and 1977; and sea_water_knudsen_salinity (S_K), used for salinity observations between 1901 and 1966. Salinity quantities that do not match any of the precise definitions should be given the more gener
al standard name of sea_water_salinity. Reference: www.teos-10.org; Lewis, 1980 doi:10.1109/JOE.1980.1145448.'
OK?
In the interests of drawing this discussion to a close, unless any objections are received in the next seven days, this name will be accepted for amendment in the standard name table.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
Centre for Environmental Data Analysis Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf
> Of John Graybeal
> Sent: 15 June 2015 19:02
> To: Nan Galbraith
> Cc: CF Metadata List; Rich Pawlowicz
> Subject: Re: [CF-metadata] Practical Salinity units
>
> These are good. I like Nan's rephrasing with Roy's substitution, better than
> what I wrote.
>
> john
>
> On Jun 15, 2015, at 10:28, Nan Galbraith <ngalbraith at whoi.edu> wrote:
>
> > Hi Roy -
> >
> > Sure, determination is fine.
> >
> > Thanks - Nan
> >
> > On 6/15/15 1:07 PM, Lowry, Roy K. wrote:
> >> Hi Nan,
> >>
> >> 'Determination'? - 'Estimate' sounds lik a guess to me.
> >>
> >> Cheers, Roy.
> >> ________________________________________
> >> From: CF-metadata [cf-metadata-bounces at cgd.ucar.edu] on behalf of
> Nan Galbraith [ngalbraith at whoi.edu]
> >> Sent: 15 June 2015 17:49
> >> To: Signell, Richard
> >> Cc: cf-metadata at cgd.ucar.edu; Rich Pawlowicz
> >> Subject: Re: [CF-metadata] Practical Salinity units
> >>
> >> Hi all -
> >>
> >> On 6/15/15 11:12 AM, Signell, Richard wrote:
> >> > I like the simpler version that John made, and Rich Pawlowicz reported
> >> > back to me that both versions are acceptable to him, so Nan, do you
> >> > think we could resolve the issue you have with John's version?
> >> >
> >> > If so, perhaps we could put this one to bed!
> >>
> >> I'm mainly concerned with 'measure of salinity' since it's ... not
> >> that. To keep this
> >> quick, maybe we could simply change word 'measure' to 'estimate'?
> >>
> >> Or to make the first sentence more clear, and less a collection of
> necessary
> >> phrases, could we break it into 2 and change it to:
> >>
> >> Practical Salinity is an estimate of 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).
> >>
> >> If that's too much, I'll go with John's version, or Alison's ... yes, it
> >> would be good
> >> to wrap this up.
> >>
> >> Thanks!
> >> Nan
> >>> On Fri, Jun 12, 2015 at 3:11 PM, Nan Galbraith <ngalbraith at whoi.edu>
> wrote:
> >>>> Hi Alison and all -
> >>>>
> >>>> Either of these definitions looks fine to me. I'd prefer Alison's,
> >>>> because John's version might be a little misleading - the phrase
> >>>> 'measure of salinity' has some implications that aren't cleared up
> >>>> fast enough in the text for me.
> >>>>
> >>>> I'm mainly interested in moving the units along, though, so whatever
> >>>> is needed for the definition to work for us is all good.
> >>>>
> >>>> Thanks very much -
> >>>> Nan
> >>>>
> >>>> On Mon, Jun 8, 2015 at 8:51 AM, <alison.pamment at stfc.ac.uk> wrote:
> >>>>
> >>>> 'Practical Salinity is defined on the Practical Salinity Scale of 1978
> >>>> (PSS-78) and is calculated from the electrical conductivity of sea water
> (as
> >>>> well as temperature and pressure). Practical Salinity is not a direct
> >>>> measure of salt concentration, rather, it is a relative scale calibrated
> >>>> against a standard potassium chloride solution containing 32.4356 g kg-
> 1 of
> >>>> KCl whose conductivity is measured at 15 degrees Celsius. Conversion
> of
> >>>> Practical Salinity to other precisely defined salinity measures should
> be
> >>>> performed by application of the appropriate formulas specified by
> TEOS-10.
> >>>> This name should not be used to describe salinity observations made
> before
> >>>> 1978, or ones not based on conductivity measurements. There are also
> >>>> standard names for the precisely defined salinity quantities
> >>>> sea_water_knudsen_salinity (S_K), used for salinity observations
> between
> >>>> 1901 and 1966, sea_water_cox_salinity (S_C), used for salinity
> observations
> >>>> between 1967 and 1977, sea_water_absolute_salinity (S_A),
> >>>> sea_water_preformed_salinity (S_*), and
> sea_water_reference_salinity.
> >>>> 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.'
> >>>>
> >>>>
> >>>>
> >>>> On 6/8/15 2:18 PM, John Graybeal wrote:
> >>>>
> >>>> Practical Salinity is a measure of salinity performed on a relative scale
> >>>> calibrated against a standard potassium chloride solution, as defined
> 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
> >>>> conductivity 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;
> >>>> sea_water_cox_salinity (S_C), used for salinity observations between
> 1967
> >>>> and 1977; and sea_water_knudsen_salinity (S_K), used for salinity
> >>>> observations 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.
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>> *******************************************************
> >>>> * Nan Galbraith Information Systems Specialist *
> >>>> * Upper Ocean Processes Group Mail Stop 29 *
> >>>> * Woods Hole Oceanographic Institution *
> >>>> * Woods Hole, MA 02543 (508) 289-2444 *
> >>>> *******************************************************
> >>>>
> >>>>
> >>>
> >>
> >> --
> >> *******************************************************
> >> * Nan Galbraith Information Systems Specialist *
> >> * Upper Ocean Processes Group Mail Stop 29 *
> >> * Woods Hole Oceanographic Institution *
> >> * Woods Hole, MA 02543 (508) 289-2444 *
> >> *******************************************************
> >>
> >>
> >> _______________________________________________
> >> CF-metadata mailing list
> >> CF-metadata at cgd.ucar.edu
> >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >> ________________________________
> >> This message (and any attachments) is for the recipient only. NERC is
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> >> ________________________________
> >>
> >
> >
> > --
> > *******************************************************
> > * Nan Galbraith Information Systems Specialist *
> > * Upper Ocean Processes Group Mail Stop 29 *
> > * Woods Hole Oceanographic Institution *
> > * Woods Hole, MA 02543 (508) 289-2444 *
> > *******************************************************
> >
> >
> > _______________________________________________
> > CF-metadata mailing list
> > CF-metadata at cgd.ucar.edu
> > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
> ---------------------------------------
> John Graybeal
> jbgraybeal at mindspring.com
> 650-450-1853
> skype: graybealski
> linkedin: http://www.linkedin.com/in/johngraybeal/
>
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Received on Tue Jun 16 2015 - 06:47:05 BST
