Dear Martin,
Thank you for your proposal which has now been added to the list of standard names under discussion:
http://cfeditor.ceda.ac.uk/proposals/1?status=active&namefilter=&proposerfilter=Claverie&descfilter=&unitfilter=&yearfilter=&filter+and+display=Filter.
fraction_of_absorbed_photosynthetically_active_radiation (canonical units 1)
I agree with Jonathan that fraction_of_surface_downwelling_photosynthetic_radiative_flux_absorbed_by_vegetation would be consistent with existing names.
Based on the definition you have provided and those of other "photosynthetic" names, the full definition of this name would currently read:
'The fraction of incoming solar radiation in the photosynthetically active radiation spectral region that is absorbed by a vegetation canopy. "Photosynthetic" radiation is the part of the spectrum which is used in photosynthesis e.g. 300-700 nm. The range of wavelengths could be specified precisely by the bounds of a coordinate of "radiation_wavelength".'
The definition text does allow for some variation of the precise wavelengths involved, so I think you would probably be OK to use the suggested name and accompany your data variable with a radiation_wavelength coordinate variable and bounds appropriate to your particular case.
Best wishes,
Alison
> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf
> Of Jonathan Gregory
> Sent: 07 May 2015 16:18
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] New standard name request for FAPAR
>
> Dear Martin
>
> OK. If that is the correct assumption, maybe your new quantity could be
> called
>
> fraction_of_surface_downwelling_photosynthetic_radiative_flux_absorbed
> _by_vegetation
>
> Best wishes
>
> Jonathan
>
>
> ----- Forwarded message from "Claverie, Martin (GSFC-6190)[Science
> Collaborator]" <martin.claverie at nasa.gov> -----
>
> > Date: Wed, 6 May 2015 17:50:01 +0000
> > From: "Claverie, Martin (GSFC-6190)[Science Collaborator]"
> > <martin.claverie at nasa.gov>
> > To: Jonathan Gregory <j.m.gregory at reading.ac.uk>, "cf-
> metadata at cgd.ucar.edu
> > Subject: RE: [CF-metadata] New standard name request for FAPAR
> >
> > Dear Jonathan
> >
> > I think your assumption is correct : "the fraction of the
> [surface_downwelling_photosynthetic_radiative_flux_in_air] which is
> absorbed by the vegetation".
> >
> > However I need to check that
> surface_downwelling_photosynthetic_radiative_flux_in_air is equivalent to
> what we called in my community the "Photosynthetically active radiation".
> >
> > If so, we could mention
> surface_downwelling_photosynthetic_radiative_flux_in_air variable in the
> FAPAR definition.
> >
> > **********
> > definition:
> > The fraction of incoming solar radiation in the photosynthetically active
> radiation spectral region (equivalent to
> surface_downwelling_photosynthetic_radiative_flux_in_air) that is
> absorbed by a vegetation canopy.
> > **********
> >
> > best regards
> >
> > Martin
> > ________________________________________
> > From: Jonathan Gregory [j.m.gregory at reading.ac.uk]
> > Sent: Wednesday, May 06, 2015 1:30 PM
> > To: cf-metadata at cgd.ucar.edu
> > Cc: Claverie, Martin (GSFC-6190)[Science Collaborator]
> > Subject: Re: [CF-metadata] New standard name request for FAPAR
> >
> > Dear Martin
> >
> > > I am proposing the following standard name for Fraction of Absorbed
> > > Photosynthetically Active Radiation (FAPAR), which is a GCOS Essential
> > > Climate Variable (ECV).
> > >
> > > standard name:
> > > fraction_of_absorbed_photosynthetically_active_radiation
> > >
> > > definition:
> > > The fraction of incoming solar radiation in the photosynthetically active
> > > radiation spectral region that is absorbed by a vegetation canopy.
> > >
> > > canonical units:
> > > 1
> >
> > We have an existing standard name of
> > surface_downwelling_photosynthetic_radiative_flux_in_air
> > and I assume your proposal means the fraction of this which is absorbed
> by
> > the vegetation. Is that right? If so, it would be better to add to this
> > existing name (without in_air, I think) to make the new one.
> >
> > Best wishes
> >
> > Jonathan
>
> ----- End forwarded message -----
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------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
Received on Fri May 08 2015 - 09:28:06 BST
