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.pamm...@stfc.ac.uk STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. > -----Original Message----- > From: Christophe Lerot [mailto:christophe.le...@aeronomie.be] > Sent: 06 December 2012 12:48 > To: Pamment, Alison (STFC,RAL,RALSP) > Cc: cf-metadata@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.pamm...@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.pamm...@stfc.ac.uk > > STFC Rutherford Appleton Laboratory > > R25, 2.22 > > Harwell Oxford, Didcot, OX11 0QX, U.K. > > > > > > > >> -----Original Message----- > >> From: Lowry, Roy K. [mailto:r...@bodc.ac.uk] > >> Sent: 04 December 2012 10:23 > >> To: Christophe Lerot > >> Cc: Pamment, Alison (STFC,RAL,RALSP); cf-metadata@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.le...@aeronomie.be] > >> Sent: 04 December 2012 10:20 > >> To: Lowry, Roy K. > >> Cc: alison.pamm...@stfc.ac.uk; cf-metadata@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-boun...@cgd.ucar.edu] On Behalf Of > >> alison.pamm...@stfc.ac.uk [alison.pamm...@stfc.ac.uk] > >>> Sent: 03 December 2012 14:18 > >>> To: cf-metadata@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.pamm...@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-boun...@cgd.ucar.edu] On > >> Behalf > >>>> Of Jonathan Gregory > >>>> Sent: 27 November 2012 20:52 > >>>> To: cf-metadata@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@cgd.ucar.edu > >>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > >>> -- > >>> Scanned by iCritical. > >>> _______________________________________________ > >>> 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 > >> -- > >> ----------------------------------------------------- > >> 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.le...@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.le...@aeronomie.be > url: http://uv-vis.aeronomie.be/ > ----------------------------------------------------- > > -- Scanned by iCritical. _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
