Hi Alison, I like that text and I think those sentences are important in the understanding of the property that has been measured and so would recommend leaving them in place.
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 alison.pamm...@stfc.ac.uk <alison.pamm...@stfc.ac.uk> Sent: 19 April 2016 12:04 To: jmau...@hawaii.edu; cf-metadata@cgd.ucar.edu Cc: j.m.greg...@reading.ac.uk Subject: Re: [CF-metadata] request for new CF standard_name: CDOM Dear John, Jonathan and Roy, Thanks for the discussion of this name, which I think has been mostly agreed: concentration_of_colored_dissolved_organic_matter_in_sea_water_expressed_as_equivalent_mass_fraction_of_quinine_sulfate_dihydrate (canonical units: 1) For the definition, I was planning to simply use the text from John's original proposal: ' The quantity concentration_of_colored_dissolved_organic_matter_in_sea_water_expressed_as_equivalent_mass_fraction_of_quinine_sulfate_dihydrate, is also commonly known as chromophoric_dissolved_organic_matter or CDOM. CDOM plays an important role in the carbon cycling and biogeochemistry of coastal waters. It occurs naturally in aquatic environments primarily as a result of tannins released from decaying plant and animal matter, which can enter coastal areas in river run-off containing organic materials leached from soils. When present in high concentrations, it imparts a brown or yellowish color to water. Its presence can negatively impact fish populations by reducing dissolved oxygen concentrations to harmful levels and by releasing nutrients and metals that contaminate the water. Increased understanding of the role of CDOM will further our ability to manage and protect coastal ecosystems. Sensors are commonly calibrated against a 100 parts per billion (ppb) quinine sulfate dihydr ate solution, a fluorescent reference standard commonly used with CDOM sensors. CDOM sensors therefore report in "QSDE" (quinine sulfate dihydrate equivalents). It is important to note, however, that CDOM concentrations in QSDE are not necessarily equivalent to the in situ CDOM concentrations in ppb.' I'm wondering whether to leave in the last two sentences about units, since we decided that CF canonical units should be '1' (dimensionless). Do you think it's better to keep that text or will it just cause confusion for CF users? If we can finalise the definition then this name can be accepted for publication in the standard name table. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: alison.pamm...@stfc.ac.uk STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John Maurer Sent: 30 March 2016 20:37 To: cf-metadata@cgd.ucar.edu Cc: Jonathan Gregory Subject: Re: [CF-metadata] request for new CF standard_name: CDOM Thanks, Jonathan and Roy! Your suggestions sound fine by me. Cheers, John Maurer Pacific Islands Ocean Observing System (PacIOOS) University of Hawaii at Manoa Date: Fri, 25 Mar 2016 09:05:08 +0000 From: "Lowry, Roy K." <r...@bodc.ac.uk> To: Jonathan Gregory <j.m.greg...@reading.ac.uk>, "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> Subject: Re: [CF-metadata] request for new CF standard_name: CDOM Message-ID: <he1pr0601mb1946c0d26c72eb4099d0efa799...@he1pr0601mb1946.eurprd06.prod.outlook.com> Content-Type: text/plain; charset="iso-8859-1" Dear Jonathan, Although long-winded your suggestion of: concentration_of_colored_dissolved_organic_matter_in_sea_water_expressed_as_equivalent_mass_fraction_of_quinine_sulfate_dihydrate has the great advantage of preventing any confusion between this measurement and a true CDOM concentration determined by some other method. Having mass_fraction in there is particularly valuable as when we encountered this measurement the stock solutions used to calibrate the sensors had the QSD concentrations expressed in nM rather than ppb. I also agree dimensionless is the best choice for the Canonical Unit. Cheers, Roy. _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ________________________________ This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system. ________________________________ _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
