Dear Jonathan,
thanks for your answer.
Then we'll go for :
volume_spectral_backwards_scattering_coefficient_of_radiative_flux_in_sea_wa
ter_due_to_particles
etc,...
I have a concern on the unit though.
The inherent optical properties in marine optics, absorption and scattering,
are the absorptance and scatterance per unit distance in the medium, and
expressed in m^-1. If they are expressed at a given wavelength (spectral
quantities), then these quantities are all spectral, but the unit is not
affected.
Same for attenuation c (attenuation c = scattering b + absorption a), so
that the change in spectral radiation per unit distance can be written:
dL/dr = -c.L+.... , c in m^-1.
Thanks again,
Best regards,
frederic
-----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, 18 September, 2009 19:34
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] CF names / inherent optical properties in seawater
Dear Fr?d?ric
Your proposed names
volume_backwards_scattering_coefficient_of_radiative_flux_in_sea_water_due_t
o_particles
volume_absorption_coefficient_of_radiative_flux_in_sea_water_due_to_phytopla
nkton
volume_absorption_coefficient_of_radiative_flux_in_sea_water_due_to_dissolve
d_organic_matter_and_non_algal_particles
volume_absorption_coefficient_of_radiative_flux_in_sea_water_due_to_non_alga
l_particles
for quantities with units of m-1 appear to be consistent with what we
already
have, and I think they are clear.
> Finally, should names start with "volume_spectral_..." to state that
> the quantities are expressed at a specific wavelength?
The definition of the existing names says that they are assumed to be an
integral over all wavelengths unless the wavelength range is specified,
which
can be done by adding a scalar or size-1 coordinate variable with
standard_name
of radiation_wavelength. The bounds of this coordinate variable would
contain
the wavelength range. However it would be appropriate to insert "spectral"
into
the standard name if the quantity is actually per unit wavelength. In that
case
the unit would be m-2 (i.e. volume absorption/scattering coeff in m-1, per
unit wavelength range in m).
Best wishes
Jonathan
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Received on Sat Sep 26 2009 - 09:42:02 BST
