Hi Alison, et al.,
I accept there is often no perfect solution. I was primarily registering my
preference/vote in case other latecomers want to chime in.
My main reason for preferring 'flux' is internal CF consistency (which is
especially important if we hope of one day transitioning to a
vocabulary/grammar system). A minor worry is that 'irradiance' may get
confused with 'spherical_irradiance'.
In summary, I think 'irradiance' is acceptable, but 'flux' is preferable.
Best wishes,
Philip
-----------------------------------------------------------------------------------
Philip Cameron-Smith, p...@llnl.gov, CliMA Group Leader, Lawrence Livermore
Nat. Lab.
-----------------------------------------------------------------------------------
From: alison.pamm...@stfc.ac.uk [mailto:alison.pamm...@stfc.ac.uk]
Sent: Monday, June 08, 2015 9:27 AM
To: Cameron-smith, Philip; jbi...@cicsnc.org; cf-metadata@cgd.ucar.edu;
odele.codding...@lasp.colorado.edu; judith.l...@nrl.navy.mil;
peter.pilews...@lasp.colorado.edu
Cc: daniel.wun...@noaa.gov
Subject: RE: [CF-metadata] New standard name requests for TSI and SSI
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.pamm...@stfc.ac.uk<mailto:j.a.pamm...@rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: Cameron-smith, Philip [mailto:cameronsmi...@llnl.gov]
Sent: 06 June 2015 03:18
To: Jim Biard; Pamment, Alison (STFC,RAL,RALSP);
cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu>;
odele.codding...@lasp.colorado.edu<mailto:odele.codding...@lasp.colorado.edu>;
judith.l...@nrl.navy.mil<mailto:judith.l...@nrl.navy.mil>;
peter.pilews...@lasp.colorado.edu<mailto:peter.pilews...@lasp.colorado.edu>
Cc: daniel.wun...@noaa.gov<mailto:daniel.wun...@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, p...@llnl.gov<mailto:p...@llnl.gov>, CliMA Group Leader,
Lawrence Livermore Nat. Lab.
-----------------------------------------------------------------------------------
From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of Jim
Biard
Sent: Thursday, June 04, 2015 7:39 AM
To: alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk>;
cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu>;
odele.codding...@lasp.colorado.edu<mailto:odele.codding...@lasp.colorado.edu>;
judith.l...@nrl.navy.mil<mailto:judith.l...@nrl.navy.mil>;
peter.pilews...@lasp.colorado.edu<mailto:peter.pilews...@lasp.colorado.edu>
Cc: daniel.wun...@noaa.gov<mailto:daniel.wun...@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.pamm...@stfc.ac.uk<mailto:alison.pamm...@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.pamm...@stfc.ac.uk<mailto:alison.pamm...@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-boun...@cgd.ucar.edu] On Behalf
Of Jonathan Gregory
Sent: 01 June 2015 17:39
To: cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu>
Cc:
odele.codding...@lasp.colorado.edu<mailto:odele.codding...@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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