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: alison.pamment at stfc.ac.uk<mailto:J.A.Pamment at rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: Cameron-smith, Philip [mailto:cameronsmith1 at llnl.gov]
Sent: 06 June 2015 03:18
To: Jim Biard; Pamment, Alison (STFC,RAL,RALSP); cf-metadata at cgd.ucar.edu; Odele.Coddington at lasp.colorado.edu; judith.lean at nrl.navy.mil; Peter.Pilewskie at lasp.colorado.edu
Cc: daniel.wunder at noaa.gov
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, pjc at llnl.gov<mailto:pjc at llnl.gov>, CliMA Group Leader, Lawrence Livermore Nat. Lab.
-----------------------------------------------------------------------------------
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Jim Biard
Sent: Thursday, June 04, 2015 7:39 AM
To: alison.pamment at stfc.ac.uk<mailto:alison.pamment at stfc.ac.uk>; cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>; Odele.Coddington at lasp.colorado.edu<mailto:Odele.Coddington at lasp.colorado.edu>; judith.lean at nrl.navy.mil<mailto:judith.lean at nrl.navy.mil>; Peter.Pilewskie at lasp.colorado.edu<mailto:Peter.Pilewskie at lasp.colorado.edu>
Cc: daniel.wunder at noaa.gov<mailto:daniel.wunder at noaa.gov>
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, alison.pamment at stfc.ac.uk<mailto:alison.pamment at stfc.ac.uk> 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: alison.pamment at stfc.ac.uk<mailto:alison.pamment at 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-bounces at cgd.ucar.edu] On Behalf
Of Jonathan Gregory
Sent: 01 June 2015 17:39
To: cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Cc: Odele.Coddington at lasp.colorado.edu<mailto:Odele.Coddington at lasp.colorado.edu>
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
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