[CF-metadata] Sea water pH values: at standard or in-situ conditions?

Matthias Tuma mtuma at wmo.int
Thu Jun 8 03:56:33 MDT 2017

Hello all,

we had a question come up for the "sea_water_ph_reported_on_total_scale"
standard name: it appears that for some communities, in particular on the
measurement side, pH would regularly be reported only after first having
converted to its equivalent at standard conditions (25C, 0dbar). In other
communities, pH would most regularly be reported at in-situ conditions
(temperature and pressure at actual measurement spot).

While we assume that the CF conventions would implicitly assume values to
be reported at in-situ conditions (i.e., the latter variant), my two
questions are:
1) whether someone can confirm this, to be 100% certain?, and
2) whether adding a few according clarifying words to the description would
be seen as useful?

Thanks and best,

Matthias Tuma
WCRP Junior Professional Officer
c/o WMO
7bis, avenue de la Paix
Case postale 2300
CH-1211 Geneva 2
Tel: +41 22 730 8217
Fax: +41 22 730 8036
Email: mtuma at wmo.int

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