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; 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.
--
*******************************************************
* 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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