Dear All,
I would like to propose two (three for the dimension) new standard names
as follows.
1. name: surface_longwave_emissivity
canonical unit: 1 ( unitless number between 0 and 1)
definition: The ratio of energy radiated by the Earth's surface to
energy radiated by a black body at the same temperature in longwave
region.
2. surface_mircrowave_emissivity
canonical unit: 1 ( unitless number between 0 and 1)
definition: The ratio of energy radiated by the Earth's surface to
energy radiated by a black body at the same temperature in microwave
frequency region.
3. name: radiation_frequency (alias: electromagnetic_frequency)
canonical unit: hertz;
definition: The radiation frequency can refer to any electromagnetic
frequency, such as light, heat radiation and radio waves
(copied and modified from "radiation_wavelength". I need
"radiaton_frequency" because the emissivity in our data set is given at
specific frequency).
Thanks,
Young-In
----------------------------------------------------
Young-In Won, Ph.D.
NASA Goddard Space Flight Center
Mail stop: 610.2
Greenbelt, MD 20771
(301) 614 6749 (O)
(301) 614 5268 (F)
young-in.won at nasa.gov
-----Original Message-----
From: Won, Young-In (GSFC-610.2)[RSIS]
Sent: Monday, February 02, 2009 4:01 PM
To: 'Jonathan Gregory'; cf-metadata at cgd.ucar.edu
Subject: RE: [CF-metadata] Emissivity not found in the current standard
nametable
Dear Jonathan,
The Surface microwave emissivity is for 1 x1 degree gridded data at
three different wavelengths (23.8, 50.3 and 89.0 GHz). So, I suppose it
can be written as (in CDL form, assuming the variable name "EmisMW" and
its dimension "MWEmisLvls"),
dimensions:
lat = 180 ;
lon = 360 ;
MWEmisLvls =3 ;
variables:
float MWEmisLvls(MWEmisLvls)
MWEmisLvls:standard_name="radiation_wavelength"; cannot find
radiation_frequency, but should be O.K.
MWEmisLvls:units="GHz";
float EmisMW(MWEmisLvls, lat, lon) ;
EmisMW: _FillValue=-9999.f;
EmisMW: long_name="Microwave spectral emissivity";
EmisMW: standard_name="surface_microwave_emissivity";
data:
MWEmisLvls = 23.8, 50.3, 89.0;
(I skippped lat, lon as those are straitforward)
Young-In
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu
[mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Jonathan Gregory
Sent: Friday, January 30, 2009 3:53 AM
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] Emissivity not found in the current standard
nametable
Dear Young-In
Yes, by analogy with surface_albedo, I think surface_emissivity would be
fine.
> - surface_ir_emissivity (or surface_longwave_emissivity)
It should be longwave, for consistence with other names.
> - surface_microwave_emissivity,
I think microwave would be OK; it would need a definition. You could
also have plain surface_emissivity and provide a (perhaps scalar)
coordinate variable of radiation_wavelength with bounds to specify the
range to which it applies precisely.
Cheers
Jonathan
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Received on Mon Feb 02 2009 - 17:21:05 GMT
