Dear Martin,
Excellent, thank you. This name is now accepted for inclusion in the standard name table and will be added at the next update.
Incidentally, I now realise that 17 existing names use the 300 - 700 nm definition of photosynthetic radiation. I will also update all of these to read "400 - 700 nm".
In the next update of the standard name table I would like to include as many as possible of the names proposed by Randy Horne et al for the GOES-R satellite series. It is going to take 2-3 weeks at least to review all the relevant names so the next update will occur in the first half of June.
Best wishes,
Alison
------
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.
> -----Original Message-----
> From: Claverie, Martin (GSFC-6190)[Science Collaborator]
> [mailto:martin.claverie at nasa.gov]
> Sent: 12 May 2015 17:23
> To: Pamment, Alison (STFC,RAL,RALSP); cf-metadata at cgd.ucar.edu;
> j.m.gregory at reading.ac.uk
> Subject: RE: [CF-metadata] New standard name request for FAPAR
>
> Dear Alison
>
> It sounds very good to me. No more remarks.
>
> best regards
>
> Martin
> ________________________________________
> From: alison.pamment at stfc.ac.uk [alison.pamment at stfc.ac.uk]
> Sent: Tuesday, May 12, 2015 10:03 AM
> To: Claverie, Martin (GSFC-6190)[Science Collaborator]; cf-
> metadata at cgd.ucar.edu; j.m.gregory at reading.ac.uk
> Subject: RE: [CF-metadata] New standard name request for FAPAR
>
> Dear Martin,
>
> Indeed, the quoted spectral region of 300 - 700 nm does come from the
> definition text of
> surface_downwelling_photosynthetic_radiative_flux_absorbed_by_vegetat
> ion. I am uncertain of the origin of this particular piece of text. I have done a
> brief online search on "photosynthetic radiation" and, as you say, the
> generally accepted definition does appear to be 400 - 700 nm. As this seems
> to be the more correct definition I will change the text for both standard
> names. This still allows for an individual data variable to have a coordinate
> variable with bounds giving a more precisely specified range of
> wavelengths if necessary.
>
> We can also include definition text to say that the quantity is often referred
> to as "fraction of absorbed photosynthetically active radiation".
>
> With a little more expansion of the definition to add in text that is normally
> included for standard names I think this now brings us to:
>
> fraction_of_surface_downwelling_photosynthetic_radiative_flux_absorbed
> _by_vegetation (canonical units: 1)
> 'Downwelling radiation is radiation from above. It does not mean "net
> downward". The quantity with standard name
> fraction_of_surface_downwelling_photosynthetic_radiative_flux_absorbed
> _by_vegetation, often called fraction of absorbed photosynthetically active
> radiation (FAPAR), is 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. 400-700 nm. The range of wavelengths
> could be specified precisely by the bounds of a coordinate of
> "radiation_wavelength". The surface called "surface" means the lower
> boundary of the atmosphere. "Vegetation" means any plants e.g. trees,
> shrubs, grass. In accordance with common usage in geophysical disciplines,
> "flux" implies per unit area, called "flux density" in physics.'
>
> Is this OK?
>
> Best wishes,
> Alison
>
> ------
> 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.
>
>
>
> > -----Original Message-----
> > From: Claverie, Martin (GSFC-6190)[Science Collaborator]
> > [mailto:martin.claverie at nasa.gov]
> > Sent: 08 May 2015 19:43
> > To: Pamment, Alison (STFC,RAL,RALSP); j.m.gregory at reading.ac.uk; cf-
> > metadata at cgd.ucar.edu
> > Subject: RE: [CF-metadata] New standard name request for FAPAR
> >
> > Dear Alison and Jonathan
> >
> > Ok, we can go forward and use
> >
> "fraction_of_surface_downwelling_photosynthetic_radiative_flux_absorbe
> > d_by_vegetation".
> >
> > however, I have 2 remarks:
> > - the spectral range is more known as 400-700nm (cf for instance
> > http://www.fao.org/gtos/doc/ECVs/T10/T10.pdf page 7) rather than 300-
> > 700. Does 300-700 range come from the
> >
> "surface_downwelling_photosynthetic_radiative_flux_absorbed_by_vegeta
> > tion" definition ?
> > - can we mention the term "fraction of absorbed photosynthetically active
> > radiation" as an alternative name in the definition ?
> >
> > best
> >
> > Martin
> > ________________________________________
> > From: alison.pamment at stfc.ac.uk [alison.pamment at stfc.ac.uk]
> > Sent: Friday, May 08, 2015 11:28 AM
> > To: j.m.gregory at reading.ac.uk; 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,
> >
> > 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=&propos
> >
> erfilter=Claverie&descfilter=&unitfilter=&yearfilter=&filter+and+display=Fil
> > ter.
> >
> > 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 -----
> > > _______________________________________________
> > > CF-metadata mailing list
> > > CF-metadata at cgd.ucar.edu
> > > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >
> > ------
> > 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 Wed May 13 2015 - 04:06:53 BST
