Dear James,

I'm not sure this is that much different to changing the definition of the 
current Standard Name to make it 'in-situ specific'. Two new Standard Names 
would be needed - one for explicit in-situ and one for explicit 25C if backward 
compatibility is to be maintained. However, as I said at the start of this 
thread I have concerns about Standard Names being used to describe measurement 
protocol rather than the measured phenomenon.


Cheers, Roy.


Please note that I partially retired on 01/11/2015. I am now only working 7.5 
hours a week and can only guarantee e-mail response on Wednesdays, my day in 
the office. All vocabulary queries should be sent to enquir...@bodc.ac.uk. 
Please also use this e-mail if your requirement is urgent.


________________________________
From: James Orr <james....@lsce.ipsl.fr>
Sent: 09 June 2017 08:08
To: Lowry, Roy K.
Cc: John Dunne - NOAA Federal; Matthias Tuma; cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] Sea water pH values: at standard or in-situ 
conditions?

All ocean modelers report pH at in situ conditions. Some ocean observers report
pH corrected to 25°C, but when doing so they often call that pH25. Many ocean
observationalists report in situ pH, for example from data collected on buoys or
ARGO floats equiped with pH sensors.

Would it make sense to define pH25 as another CF variable in addition to the
current pH variable (in situ pH)? These variables may be considered as different
as in situ temperature and potential temperature.

regards,

Jim

On Thu, 8 Jun 2017, Lowry, Roy K. wrote:

>
> Hi John,
>
>
> Totally agree with you about the confidence level and what people SHOULD be 
> doing.
>
>
> However, I am uncomfortable with CF becoming a tool to force those who have 
> quoted at standard conditions and
> used the existing Standard Name rework their data. However, should a formal 
> approach from a
> recognised authority in the carbonate chemistry community be made to CF then 
> my comfort level might rise
> somewhat. Then it is they who is forcing the change, not CF.
>
>
> Cheers, Roy.
>
>
> Please note that I partially retired on 01/11/2015. I am now only working 7.5 
> hours a week and can only
> guarantee e-mail response on Wednesdays, my day in the office. All vocabulary 
> queries should be sent to
> enquir...@bodc.ac.uk. Please also use this e-mail if your requirement is 
> urgent.
>
>
>
> _____________________________________________________________________________________________________________
> From: CF-metadata <cf-metadata-boun...@cgd.ucar.edu> on behalf of John Dunne 
> - NOAA Federal
> <john.du...@noaa.gov>
> Sent: 08 June 2017 18:58
> To: Matthias Tuma
> Cc: cf-metadata@cgd.ucar.edu
> Subject: Re: [CF-metadata] Sea water pH values: at standard or in-situ 
> conditions?
> Hi Matthias,
>
> I'm going to have to go with in-situ, unless someone can correct me 
> otherwise.  I'm 86.33% confident,
> however.  I have been looking at Jim Orr's documentation
> (http://www.geosci-model-dev-discuss.net/gmd-2016-155/gmd-2016-155.pdf), and 
> it cites:
Biogeochemical protocols and diagnostics for the CMIP6 
...<http://www.geosci-model-dev-discuss.net/gmd-2016-155/gmd-2016-155.pdf>
www.geosci-model-dev-discuss.net
Biogeochemical protocols and diagnostics for the CMIP6 Ocean Model 
Intercomparison Project (OMIP) James C. Orr 1, Raymond G. Najjar 2, Olivier 
Aumont 3, Laurent Bopp ...



> Biogeochemical protocols and diagnostics for the CMIP6 ...
> www.geosci-model-dev-discuss.net<http://www.geosci-model-dev-discuss.net>
GMDD - Recent<http://www.geosci-model-dev-discuss.net/>
www.geosci-model-dev-discuss.net
A. Anthony Bloom, Kevin W. Bowman, Meemong Lee, Alexander J. Turner, Ronny 
Schroeder, John R. Worden, Richard Weidner, Kyle C. McDonald, and Daniel J. 
Jacob



> Biogeochemical protocols and diagnostics for the CMIP6 Ocean Model 
> Intercomparison Project (OMIP) James C.
> Orr 1, Raymond G. Najjar 2, Olivier Aumont 3, Laurent Bopp ...
>
>
> Dickson, A. G., Sabine, C. L., and Christian, J. R.: Guide to best practices 
> for ocean CO2 measurements, ,
> PICES Special Publication 3, 191
> pp., http://aquaticcommons.org/1443/, 2007.
[http://aquaticcommons.org/1443/1.haspreviewThumbnailVersion/Guide_all_in_one.pdf]<http://aquaticcommons.org/1443/>

Guide to best practices for ocean CO2 measurements 
...<http://aquaticcommons.org/1443/>
aquaticcommons.org
Item Type: Monograph or Serial Issue Title: Guide to best practices for ocean 
CO2 measurements: Personal Creator/Author:



>
> [Guide_all_in_one.pdf]
> Guide to best practices for ocean CO2 measurements ...
> aquaticcommons.org
> Item Type: Monograph or Serial Issue Title: Guide to best practices for ocean 
> CO2 measurements: Personal
> Creator/Author:
>
> which gives the calculations for pH on the total scale in SOP6a and SOP6b as 
> a function of insitu T as a
> variable.  Also, I would argue from an environmental science perspective that 
> we *should* be posting the
> insitu variable.
>
> Hope that helps! John
>
>
>
>
>
> On Thu, Jun 8, 2017 at 5:56 AM, Matthias Tuma <mt...@wmo.int> wrote:
>       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
>
>       --
>       Matthias Tuma
> WCRP Junior Professional Officer
> c/o WMO
> 7bis, avenue de la Paix
> Case postale 2300
> CH-1211 Geneva 2
> Switzerland
> Tel: +41 22 730 8217
> Fax: +41 22 730 8036
> Email: mt...@wmo.int
> http://www.wcrp-climate.org
World Climate Research Programme (WCRP)<http://www.wcrp-climate.org/>
www.wcrp-climate.org
The aims of WCRP is to facilitate analysis and prediction of Earth System 
variability and change for use in an increasing range of practical applications 
of direct relevance, benefit and value to society



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