[CF-metadata] Direct radiation standard name

Jonathan Gregory j.m.gregory at reading.ac.uk
Sun Jan 8 14:32:15 MST 2017


Dear Henry

These seem fine to me, since there are existing names of exactly this form
with "diffuse" instead of "direct".

Thanks

Jonathan

----- Forwarded message from "Odbert, Henry" <henry.odbert at metoffice.gov.uk> -----

> Date: Fri, 6 Jan 2017 07:39:55 +0000
> From: "Odbert, Henry" <henry.odbert at metoffice.gov.uk>
> To: "'cf-metadata at cgd.ucar.edu'" <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] Direct radiation standard name
> 
> Dear all,
> 
> I have been unable to find appropriate standard names for Direct (aka 'beam') shortwave radiation. Diffuse and Global SW radiation are listed already.
> 
> Unless I've missed something, I suggest the following additions:
> 
> direct_downwelling_shortwave_flux_in_air<javascript:void(0)> (unit: W m-2)
> 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. "shortwave" means shortwave radiation. "Direct" (also known as "beam") radiation is radiation that has followed a direct path from the sun and is alternatively known as "direct insolation".
> 
> surface_direct_downwelling_shortwave_flux_in_air<javascript:void(0)> (unit: W m-2)
> Downwelling radiation is radiation from above. It does not mean "net downward". "Direct" (also known as "beam") radiation is radiation that has followed a direct path from the sun and is alternatively known as "direct insolation". 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. The surface called "surface" means the lower boundary of the atmosphere. "shortwave" means shortwave radiation.
> 
> 
> 
> Thank you
> Henry
> 
> 
> Dr Henry Odbert  Senior Post Processing Scientist
> Met Office  FitzRoy Road  Exeter  Devon  EX1 3PB  United Kingdom
> Tel: +44 (0)1392 885164  Direct: +44 (0)7770 645044
> Email: henry.odbert at metoffice.gov.uk<mailto:henry.odbert at metoffice.gov.uk>  Website: www.metoffice.gov.uk<http://www.metoffice.gov.uk/>
> 

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