[CF-metadata] Question to usage of standard_name sea_water_practical_salinity

From: Lowry, Roy K. <rkl>
Date: Wed, 15 May 2019 14:47:02 +0000

Dear Daniel,

The value you should store is 35. There is much discussion in the CF archives on the various types of salinity and their units that is best not repeated. It may help your understanding to think of the reason practical salinity is dimensionless and has the canonical unit 1 as being because it is derived from a dimensionless electrical conductivity ratio.

Cheers, Roy.


I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address.

________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Daniel Neumann <daniel.neumann at io-warnemuende.de>
Sent: 15 May 2019 11:58
To: CF Metadata Mail List
Subject: [CF-metadata] Question to usage of standard_name sea_water_practical_salinity

Dear list,

The standard name "sea_water_practical_salinity" has the unit "1". The
CF FAQ says that "1" is used instead of "psu" as unit
(http://cfconventions.org/faq.html#udunits_missing).

If we have "35 psu", does the variable "sea_water_practical_salinity"
has a value of 35 (just unit "psu" removed) or of 0.035 (35 psu approx.
35 g/kg = 0.035 g/g = 0.035)?

Best Regards,
Daniel

--
Daniel Neumann
Leibniz Institute for Baltic Sea Research Warnemuende
Physical Oceanography and Instrumentation
Seestrasse 15
18119 Rostock
Germany
phone:  +49-381-5197-287
fax:    +49-381-5197-114 or 440
e-mail: daniel.neumann at io-warnemuende.de
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Received on Wed May 15 2019 - 08:47:02 BST