Hi Martin,
There are two Standard Names 'downwelling_shortwave_flux_in_air' and 'downwelling_longwave_flux_in_air'. Do either of these fit your data. I have associated the former with downwelling irradiance data from PAR cosine-collector light meters.
Cheers, Roy.
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Schultz, Martin
Sent: 18 February 2011 13:28
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] CF standard_name irradiation ?
Dear colleagues,
I am trying to clean up some data files and make them CF compliant. But I am confused about the standard name that I could use for (measured) irradiation. There is an entry
"downwelling_spectral_radiative_flux_in_air
Downwelling radiation is radiation from above. It does not mean "net downward". "spectral" means per unit wavelength or as a function of wavelength; spectral quantities are sometimes called "monochromatic". Radiation wavelength has standard name radiation_wavelength. When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics."
This definition explicitly mentions "irradiance", so I guess I am close to the solution. However, the irradiance measurement data I have are not "spectral". I did not find a standard_name entry "downwelling_radiative_flux_in_air" which I would have expected to be the integral flux. There are only various variants of "surface_net..." or "surface_spectral..." fluxes. These don't help, or am I wrong here?
Unless I am mistaken or have overlooked something obvious, I therefore propose to add a standard_name tabel entry:
"downwelling_radiative_flux_in_air
Downwelling radiation is radiation from above. It does not mean "net downward". When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. For spectrally resolved radiative flux or net radiative flux see downwelling_spectral_radiative_flux_in_air
or surface_net_downward_radiative_flux, respectively."
Best regards,
Martin Schultz
= Dr. Martin G. Schultz, IEK-8, Forschungszentrum J?lich =
= D-52425 J?lich, Germany =
= ph: +49 (0)2461 61 2831, fax: +49 (0)2461 61 8131 =
= email: m.schultz at fz-juelich.de =
= web:
http://www.fz-juelich.de/icg/icg-2/m_schultz =
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Received on Fri Feb 18 2011 - 06:37:33 GMT
