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

John Graybeal jbgraybeal at mindspring.com
Thu Jun 8 10:29:54 MDT 2017


Matthias,

Having talked to a number of scientists and data processing folks when trying to advance these proposals, it was clear that all different scenarios were possible. We tried to write the descriptions to describe the meaning of the value, without regard to the circumstances of the measurement. (So a lab measurement and an in situ measurement will have the same name if they are numerically comparable.)

So I don't believe your assumptions are correct, if I understand them correctly. 

John

> On Jun 8, 2017, at 08:32, Matthias Tuma <mtuma at wmo.int> wrote:
> 
> Dear Roy,
> 
> thank you for your helpful comment on the in-situ conditions.
> 
> For the question about adding this information in some way, perhaps I had worded this ambiguously. I was more asking about updating the description (and not in fact the standard name).
> 
> Best regards,
> Matthias
> 
> 
> 
> 
>> On Thu, Jun 8, 2017 at 12:18 PM, Lowry, Roy K. <rkl at bodc.ac.uk> wrote:
>> Dear Matthias,
>> 
>> 
>> All I can say that is that in-situ conditions were my assumption when involved in the initial discussions on this issue. However, I would not rely on the Standard Name to convey such detailed usage metadata information. Its function is to describe what was measured rather than the details of how it was measured.
>> 
>> 
>> For many years I have been suggesting the development of O&M Process Document standard profiles to do this job properly. In the mean time all I can suggest is to use the Long Name parameter attribute if you need to label more explicitly in 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 enquiries at bodc.ac.uk. Please also use this e-mail if your requirement is urgent.
>> 
>> 
>> 
>> From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Matthias Tuma <mtuma at wmo.int>
>> Sent: 08 June 2017 10:56
>> To: cf-metadata at cgd.ucar.edu
>> Subject: [CF-metadata] Sea water pH values: at standard or in-situ conditions?
>>  
>> 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: mtuma at wmo.int
>> http://www.wcrp-climate.org
>> 
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> 
> 
> 
> -- 
> 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: mtuma at wmo.int
> http://www.wcrp-climate.org
> 
> ------------------------------------------------------------------------------
> The information contained in this electronic message and any attachments are intended for specific individuals or entities, and may be confidential, proprietary or privileged. If you are not the intended recipient, please notify the sender immediately, delete this message and do not disclose,  distribute or copy it to any third party or otherwise use this message. The content of this message does not necessarily reflect the official position of the World Meteorological Organization (WMO) unless specifically stated. Electronic messages are not secure or error free and may contain viruses or may be delayed, and the sender is not liable for any of these occurrences.
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