Dear Rich,
Thank you - I'll add this into the text.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
Centre for Environmental Data Analysis Email: alison.pamment at stfc.ac.uk<mailto:J.A.Pamment at rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: Rich Pawlowicz [mailto:rpawlowicz at eos.ubc.ca]
Sent: 17 June 2015 16:39
To: Pamment, Alison (STFC,RAL,RALSP)
Cc: jbgraybeal at mindspring.com; ngalbraith at whoi.edu; cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Practical Salinity units
I see you have symbols for all salinities except reference salinity, but for consistency I will point
out that it has a symbol of S_R.
Rich.
On Jun 16, 2015, at 6:47 AM, alison.pamment at stfc.ac.uk<mailto:alison.pamment at stfc.ac.uk> wrote:
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<
http://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<mailto: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<mailto: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<mailto:cf-metadata-bounces at cgd.ucar.edu>] on behalf of
Nan Galbraith [ngalbraith at whoi.edu<mailto:ngalbraith at whoi.edu>]
Sent: 15 June 2015 17:49
To: Signell, Richard
Cc: cf-metadata at cgd.ucar.edu<mailto: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<mailto: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<mailto: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<
http://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<
http://www.teos-10.org>; Lewis, 1980
doi:10.1109/JOE.1980.1145448.
--
*******************************************************
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* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 (508) 289-2444 *
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* Woods Hole, MA 02543 (508) 289-2444 *
*******************************************************
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---------------------------------------
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650-450-1853
skype: graybealski
linkedin: http://www.linkedin.com/in/johngraybeal/
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--
Rich Pawlowicz, Associate Professor, Ocean Dynamics Laboratory
Dept. of Earth, Ocean, and Atmospheric Sciences, University of British Columbia
6339 Stores Rd., Vancouver BC CANADA V6T 1Z4
web: http://www.eos.ubc.ca/~rich tel: 604-822-1356
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