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
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
> Cc: 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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Received on Thu Jun 04 2015 - 08:11:46 BST
