Thanks for the follow-up, Alison. I agree with Roy, and I I think it looks good. I might question the underlines in "chromophoric_dissolved_organic_matter", though, unless that is going to be an acceptable alias standard_name in the CF table. Cheers, John
On Tue, Apr 19, 2016 at 1:14 AM, Lowry, Roy K. <[email protected]> wrote: > 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 > [email protected]. Please also use this e-mail if your requirement is > urgent. > > ________________________________________ > From: CF-metadata <[email protected]> on behalf of > [email protected] <[email protected]> > Sent: 19 April 2016 12:04 > To: [email protected]; [email protected] > Cc: [email protected] > 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 dihydrate 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: > [email protected] > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Campus, Didcot, OX11 0QX, U.K. > > > From: CF-metadata [mailto:[email protected]] On Behalf Of > John Maurer > Sent: 30 March 2016 20:37 > To: [email protected] > 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." <[email protected]> > To: Jonathan Gregory <[email protected]>, > "[email protected]" <[email protected]> > 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 > [email protected] > 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. > ________________________________ >
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