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 ... 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: 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<mailto: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<tel:+41%2022%20730%2082%2017> Fax: +41 22 730 8036<tel:+41%2022%20730%2080%2036> Email: mt...@wmo.int<mailto:mt...@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. 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