Dear Philip, As I'm sure you will have seen, this point has caused a lot of discussion and gave rise to Jonathan's separate question about whether we should change all 'flux' names to 'flux_density'. I note that you voted 'no' to that change, and there does seem to be an emerging majority for that view.
As far as these particular names are concerned, using 'irradiance' is the compromise we arrived at as the proposers really weren't happy with using 'flux'. It is true that we haven't managed to achieve complete consistency with existing names, but we have sometimes in the past allowed community specific names into the table to make them more recognizable to those most likely to use them (the recently agreed name of apparent_oxygen_utilization is an example of this). 'Irradiance' is a term that already appears in some standard names (as spherical_irradiance) and in the definitions of all flux quantities. Conversely, 'flux' will appear in the definitions of the TSI and SSI names. Thus I continue to support solar_irradiance and solar_irradiance_per_unit_wavelength as the best option for compromise and agreement on these quantities. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: [email protected]<mailto:[email protected]> STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. From: Cameron-smith, Philip [mailto:[email protected]] Sent: 06 June 2015 03:18 To: Jim Biard; Pamment, Alison (STFC,RAL,RALSP); [email protected]; [email protected]; [email protected]; [email protected] Cc: [email protected] Subject: RE: [CF-metadata] New standard name requests for TSI and SSI Hi All, Even though I personally have one foot in the radiation camp and like irradiance, I prefer that CF go with 'flux' rather than 'irradiance' in order to be consistent with all of the existing radiative flux std_names. Hence, my vote is for: solar_flux (W m-2) solar_flux_per_unit_wavelength (W m-2 m-1) Best wishes, Philip ----------------------------------------------------------------------------------- Philip Cameron-Smith, [email protected]<mailto:[email protected]>, CliMA Group Leader, Lawrence Livermore Nat. Lab. ----------------------------------------------------------------------------------- From: CF-metadata [mailto:[email protected]] On Behalf Of Jim Biard Sent: Thursday, June 04, 2015 7:39 AM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Cc: [email protected]<mailto:[email protected]> Subject: Re: [CF-metadata] New standard name requests for TSI and SSI Looks great to me! Thanks for all the hard work! On 6/4/15 10:11 AM, [email protected]<mailto:[email protected]> wrote: Dear All, I agree with Jonathan's recent summary of the discussion and support the standard names as suggested by Jim and Jonathan. Odele, Peter and Judith, the proposers, have all previously indicated that this would be an acceptable solution, so I think we now have consensus on the names. Based on the discussion in this thread and our usual wording for standard name definitions I suggest that the following be added to the standard name table: solar_irradiance (W m-2) 'The quantity with standard name solar_irradiance, often called Total Solar Irradiance (TSI), is radiation from the sun integrated over the whole electromagnetic spectrum and over the entire solar disk. The quantity applies outside the atmosphere, by default at a distance of one astronomical unit from the Sun, but a coordinate or scalar coordinate variable of distance_from_sun can be used to specify a value other than the default. "Irradiance" means the power per unit area (called radiative flux in other standard names), the area being normal to the direction of flow of the radiant energy.' solar_irradiance_per_unit_wavelength (W m-2 m-1) 'The quantity with standard name solar_irradiance_per_unit_wavelength, often called Solar Spectral Irradiance (SSI), is the radiation from the sun as a function of wavelength integrated over the entire solar disk. A coordinate variable for radiation wavelength should be given the standard name radiation_wavelength. The quantity applies outside the atmosphere, by default at a distance of one astronomical unit from the Sun, but a coordinate or scalar coordinate variable of distance_from_sun can be used to specify a value other than the default. "Irradiance" means the power per unit area (called radiative flux in other standard names), the area being normal to the direction of flow of the radiant energy. ' distance_from_sun (m) The distance from the sun to the point of observation. Are there any further comments on these names? Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/Centre for Environmental Data Archival Email: [email protected]<mailto:[email protected]> STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. -----Original Message----- From: CF-metadata [mailto:[email protected]] On Behalf Of Jonathan Gregory Sent: 01 June 2015 17:39 To: [email protected]<mailto:[email protected]> Cc: [email protected]<mailto:[email protected]> Subject: Re: [CF-metadata] New standard name requests for TSI and SSI Dear all Few opinions still have been given about whether we should change flux to flux_density in standard names, and those few are a majority against doing so. Since the proposers aren't happy with "flux" for "irradiance" in W m-2, I think the best compromise is solar_irradiance (W m-2) solar_irradiance_per_unit_wavelength (W m-3) where the definition should note that "irradiance" means the power per unit area (called radiative flux in other standard names), the area being normal to a vector from the Sun to the Earth, and the quantity applies outside the atmosphere, by default at a distance of one astronomical unit from the Sun, but a coordinate or scalar coordinate variable of distance_from_sun can be specified to replace the default. distance_from_sun (m) is therefore also required as a new standard name. Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected]<mailto:[email protected]> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected]<mailto:[email protected]> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- [CICS-NC]<http://www.cicsnc.org/>Visit us on Facebook <http://www.facebook.com/cicsnc> Jim Biard Research Scholar Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/> North Carolina State University <http://ncsu.edu/> NOAA National Centers for Environmental Information <http://ncdc.noaa.gov/> formerly NOAA's National Climatic Data Center 151 Patton Ave, Asheville, NC 28801 e: [email protected]<mailto:[email protected]> o: +1 828 271 4900 Connect with us on Facebook for climate<https://www.facebook.com/NOAANCEIclimate> and ocean and geophysics<https://www.facebook.com/NOAANCEIoceangeo> information, and follow us on Twitter at @NOAANCEIclimate<https://twitter.com/NOAANCEIclimate> and @NOAANCEIocngeo<https://twitter.com/NOAANCEIocngeo>.
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