Dear Christophe and Roy,
Thank you for the discussion; I think we are agreed! The name will go into the standard name table as follows:
atmosphere_mole_content_of_ozone; mol m-2
Definition: ' "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. The construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for ozone is O3. atmosphere_mole_content_of_ozone is usually measured in Dobson Units (DU) which are equivalent to 446.2 micromoles m-2.'
This name is accepted for inclusion in the standard name table and will be added at the next update.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
> -----Original Message-----
> From: Christophe Lerot [mailto:Christophe.Lerot at aeronomie.be]
> Sent: 06 December 2012 12:48
> To: Pamment, Alison (STFC,RAL,RALSP)
> Cc: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] new standard name proposal for total ozone in
> DU
>
> Hi Alison and Roy,
>
> I think that the solution you proposed is suitable to the O3 community.
>
> Having the canonical unit (mol/m-2) for the O3 columns in the
> vocabulary server is fine as long as it is not a problem to use a
> different unit (Dobson Unit) in the NetCDF files. The important point is
> that the variables are expressed in the commonly used units so that the
> users can understand the file content at a glance.
>
> Best regards,
> Christophe
>
> On 5/12/2012 11:30, alison.pamment at stfc.ac.uk wrote:
> > Dear Roy and Christophe,
> >
> > As Roy says, we usually use SI units for the canonical unit in the standard
> name table. There are a few exceptions, for example, age_of_sea_ice has
> units of year and age_of_surface_snow has units of day, whereas the SI unit
> for both quantities would be the second. Also, we allowed some of the
> recently added salinity names to have canonical units of g kg-1 which I'm not
> sure adheres strictly to SI. I think the reason for having the exceptions was
> simply that they are the units that are always used with the named
> quantities.
> >
> > For Christophe's ozone name, atmosphere_mole_content_of_ozone, the
> proposed definition is ' "Content" indicates a quantity per unit area. The
> "atmosphere content" of a quantity refers to the vertical integral from the
> surface to the top of the atmosphere. For the content between specified
> levels in the atmosphere, standard names including
> content_of_atmosphere_layer are used. The construction
> "atmosphere_mole_content_of_X" means the vertically integrated number
> of moles of X above a unit area. The chemical formula for ozone is O3.'
> Whatever we decide about the units, I think we should add the sentence
> 'atmosphere_mole_content_of_ozone is usually measured in Dobson Units
> which are equivalent to 446.2 micromoles m-2'.
> >
> > Roy's proposed solution of having canonical units of mol m-2 while using
> Dobson Units in the data files is certainly consistent with the CF
> conventions. As long as UDUNITS knows how to convert the units in the file
> to the canonical units there is no problem. Christophe, would that be
> acceptable to the ozone community?
> >
> > Roy, is there any technical reason why we couldn't map to Dobson Units in
> the vocabulary server if that were the preferred solution?
> >
> > Best wishes,
> > Alison
> >
> > ------
> > Alison Pamment Tel: +44 1235 778065
> > NCAS/British Atmospheric Data Centre Email:
> alison.pamment at stfc.ac.uk
> > STFC Rutherford Appleton Laboratory
> > R25, 2.22
> > Harwell Oxford, Didcot, OX11 0QX, U.K.
> >
> >
> >
> >> -----Original Message-----
> >> From: Lowry, Roy K. [mailto:rkl at bodc.ac.uk]
> >> Sent: 04 December 2012 10:23
> >> To: Christophe Lerot
> >> Cc: Pamment, Alison (STFC,RAL,RALSP); cf-metadata at cgd.ucar.edu
> >> Subject: RE: [CF-metadata] new standard name proposal for total ozone
> in
> >> DU
> >>
> >> Hello Cristophe,
> >>
> >> To be absolutely clear, I'm saying the data should be stored in the NetCDF
> in
> >> Dobson Units, that the units parameter attribute in the NetCDF file
> should
> >> be Dobson Units, but that the canonical unit in the Standard Names List
> and
> >> therefore the units mapped in our server should be moles per square
> >> metre.
> >>
> >> Cheers, Roy.
> >>
> >> ________________________________________
> >> From: Christophe Lerot [Christophe.Lerot at aeronomie.be]
> >> Sent: 04 December 2012 10:20
> >> To: Lowry, Roy K.
> >> Cc: alison.pamment at stfc.ac.uk; cf-metadata at cgd.ucar.edu
> >> Subject: Re: [CF-metadata] new standard name proposal for total ozone
> in
> >> DU
> >>
> >> Dear Roy,
> >>
> >> Do you mean that the total ozone values should be given in moles per
> >> square metre in the NetCDF files themselves? Or do you mean that I
> >> should simply add a specific comment in the unit parameter attribute to
> >> make clear that the values are provided in Dobson Unit?
> >> The Dobson Unit is quite common for total ozone users and I'd prefer to
> >> stay with this unit if possible.
> >>
> >> Cheers,
> >> Christophe
> >>
> >> On 3/12/2012 15:39, Lowry, Roy K. wrote:
> >>> Hello Alison,
> >>>
> >>> Surely the canonical unit for Dobson Units would be moles per square
> >> metre, with Dobson Units appearing as the scaled unit in the units
> >> parameter attribute. Making Dobson Units the canonical unit would be
> like
> >> having cm/s rather than m/s as a canonical unit.
> >>> Cheers, Roy.
> >>> ________________________________________
> >>> 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: 03 December 2012 14:18
> >>> To: cf-metadata at cgd.ucar.edu
> >>> Subject: Re: [CF-metadata] new standard name proposal for total ozone
> in
> >> DU
> >>> Dear Christophe and Jonathan,
> >>>
> >>> I also support this proposal. We don't currently have any standard
> names
> >> that use Dobson Units - I think UDUnits1 didn't support it. However, since
> it
> >> is defined in UDunits2 I don't see any problem with adding it.
> >>> Best wishes,
> >>> Alison
> >>>
> >>> ------
> >>> Alison Pamment Tel: +44 1235 778065
> >>> NCAS/British Atmospheric Data Centre Email:
> >> alison.pamment at stfc.ac.uk
> >>> STFC Rutherford Appleton Laboratory
> >>> R25, 2.22
> >>> Harwell Oxford, Didcot, OX11 0QX, U.K.
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On
> >> Behalf
> >>>> Of Jonathan Gregory
> >>>> Sent: 27 November 2012 20:52
> >>>> To: cf-metadata at cgd.ucar.edu
> >>>> Subject: [CF-metadata] new standard name proposal for total ozone in
> >> DU
> >>>> Dear Christophe
> >>>>
> >>>>> So I'd like to propose the following variable name for total ozone
> >>>>> columns based on recommendations I was given:
> >>>>> - "atmosphere_mole_content_of_ozone" expressed in Dobson Units.
> >>>>> Dobson Unit (DU) is already defined in the UDUNIT package ans is
> >>>>> equivalent to 446.2 micromoles m-2.
> >>>> This seems fine to me. It is consistent in construction with existing
> >>>> names
> >>>> for a quantity in mol m-2.
> >>>>
> >>>> Best wishes
> >>>>
> >>>> Jonathan
> >>>> _______________________________________________
> >>>> CF-metadata mailing list
> >>>> CF-metadata at cgd.ucar.edu
> >>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >>> --
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> >>>
> >>> This message (and any attachments) is for the recipient only. NERC is
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> >> --
> >> -----------------------------------------------------
> >> Dr. Christophe LEROT
> >> Belgian Institute for Space Aeronomy
> >> Chemistry & Physics of Atmospheres
> >> Avenue circulaire, 3
> >> 1180 Brussels
> >> Belgium
> >> phone: +32/(0)2-3730-407
> >> mobile: +32/(0)472-81.87.00
> >> mail: christophe.lerot at aeronomie.be
> >> url: http://uv-vis.aeronomie.be/
> >> -----------------------------------------------------
> >>
> >> 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.
>
> --
> -----------------------------------------------------
> Dr. Christophe LEROT
> Belgian Institute for Space Aeronomy
> Chemistry & Physics of Atmospheres
> Avenue circulaire, 3
> 1180 Brussels
> Belgium
> phone: +32/(0)2-3730-407
> mobile: +32/(0)472-81.87.00
> mail: christophe.lerot at aeronomie.be
> url: http://uv-vis.aeronomie.be/
> -----------------------------------------------------
>
>
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Received on Thu Dec 06 2012 - 06:33:23 GMT
