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. <rkl at bodc.ac.uk> 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
> 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
> alison.pamment at stfc.ac.uk <alison.pamment at stfc.ac.uk>
> Sent: 19 April 2016 12:04
> To: jmaurer at hawaii.edu; cf-metadata at cgd.ucar.edu
> Cc: j.m.gregory at 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 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:
> alison.pamment at stfc.ac.uk
> STFC Rutherford Appleton Laboratory
> R25, 2.22
> Harwell Campus, Didcot, OX11 0QX, U.K.
>
>
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> John Maurer
> Sent: 30 March 2016 20:37
> To: cf-metadata at 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." <rkl at bodc.ac.uk>
> To: Jonathan Gregory <j.m.gregory at reading.ac.uk>,
> "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> Subject: Re: [CF-metadata] request for new CF standard_name: CDOM
> Message-ID:
> <
> HE1PR0601MB1946C0D26C72EB4099D0EFA799830 at 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.
> _______________________________________________
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> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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