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: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. > -----Original Message----- > From: Claverie, Martin (GSFC-6190)[Science Collaborator] > [mailto:[email protected]] > Sent: 12 May 2015 17:23 > To: Pamment, Alison (STFC,RAL,RALSP); [email protected]; > [email protected] > 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: [email protected] [[email protected]] > Sent: Tuesday, May 12, 2015 10:03 AM > To: Claverie, Martin (GSFC-6190)[Science Collaborator]; cf- > [email protected]; [email protected] > 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: > [email protected] > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Oxford, Didcot, OX11 0QX, U.K. > > > > > -----Original Message----- > > From: Claverie, Martin (GSFC-6190)[Science Collaborator] > > [mailto:[email protected]] > > Sent: 08 May 2015 19:43 > > To: Pamment, Alison (STFC,RAL,RALSP); [email protected]; cf- > > [email protected] > > 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: [email protected] [[email protected]] > > Sent: Friday, May 08, 2015 11:28 AM > > To: [email protected]; [email protected] > > 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:[email protected]] On > > Behalf > > > Of Jonathan Gregory > > > Sent: 07 May 2015 16:18 > > > To: [email protected] > > > 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]" <[email protected]> ----- > > > > > > > Date: Wed, 6 May 2015 17:50:01 +0000 > > > > From: "Claverie, Martin (GSFC-6190)[Science Collaborator]" > > > > <[email protected]> > > > > To: Jonathan Gregory <[email protected]>, "cf- > > > [email protected] > > > > 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 [[email protected]] > > > > Sent: Wednesday, May 06, 2015 1:30 PM > > > > To: [email protected] > > > > 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 > > > [email protected] > > > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > > > ------ > > Alison Pamment Tel: +44 1235 778065 > > NCAS/Centre for Environmental Data Archival Email: > > [email protected] > > STFC Rutherford Appleton Laboratory > > R25, 2.22 > > Harwell Oxford, Didcot, OX11 0QX, U.K. _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
