Dear Jonathan and Michael,
Thank you very much, please find below my comments and suggestions regarding
the Standard Names to give to some of the Optical Properties:
Lw: Water Leaving Radiance:
above_surface_spectral_radiance_leaving_the_sea_water: W m-2 m-1 sr-1
above_surface_radiance_leaving_the_sea_water: W m-2 sr-1
The change is necessary as the term 'upwelling' you suggested refers to 'Lu'
rather than to 'Lw'.
Kd: Diffuse Attenuation Coefficient
volume_attenuation_coefficient_of_downward_irradiance_in_sea_water: m-1
What Michael proposes is in oceanography referred to as "C", "Beam Attenuation
Coefficient" which is an inherent optical property and is not the same quantity
as Kd.
I would therefore propose two different Standard Names, Kd as above and:
C: Beam Attenuation Coefficient
beam_attenuation_coefficient_of_downward_irradiance_in_sea_water
CDOM: OK with your suggestion
TSM: OK with your suggestion
Alpha: OK with your suggestion
I look foward to your comments.
Best Regards,
Pepe
>-- Messaggio Originale --
>Date: Mon, 26 Sep 2005 08:50:25 +0100
>From: Jonathan Gregory <j.m.gregory at reading.ac.uk>
>To: cf-metadata at cgd.ucar.edu
>Subject: [CF-metadata] standard names to be added on 3rd Oct
>
>
>Dear Michael and Pepe
>
>> * volume_attenuation_coefficient_of_radiation_in_sea_water:m-1
>> it could also be expressed as:
>> * volume_beam_attenuation_coefficient_of_radiation_in_sea_water:m-1
>> which would differentiate it from:
>> * volume_diffusive_attenuation_coefficient_of_radiation_in_sea_water:m-1
>> In a nutshell, the difference is in the angles considered. Beam attenuation
>> considers the attenuation of (semi-)coherent light in a forward direction,
>> while diffusive attenuation considers the attenuation from a diffuse source,
>> which allows for a lot more forward scattering to be included in the
>> measurement.
>
>I propose we should stick with the plain attenuation, since it appears to
>be in
>common use (for atmosphere as well) and find some other way to draw this
>distinction. (But if necessary we can change our mind later and use aliases.)
>The explanation helps. How do you measure a diffuse attenuation?
>
>I think we have agreed that
>> * volume_backwards_scattering_coefficient_of_radiation_in_sea_water:m-1
>is to be defined as an integral over backward angles, so it won't have a
>coordinate specifying the angle.
>
>The following is the list of names proposed to be added next Monday 3rd
unless
>there are any further comments:
>
>aerosol_angstrom_exponent:1
>atmosphere_optical_thickness_due_to_aerosol:1
>bioluminescent_photon_rate_in_sea_water:s-1 m-3
>concentration_of_suspended_matter_in_sea_water:kg m-3
>fractional_saturation_of_oxygen_in_sea_water:1
>height_above_sea_floor:m
>moles_of_nitrate_and_nitrite_per_unit_mass_in_sea_water:mol kg-1
>moles_of_nitrate_per_unit_mass_in_sea_water:mol kg-1
>moles_of_nitrite_per_unit_mass_in_sea_water:mol kg-1
>moles_of_oxygen_per_unit_mass_in_sea_water:mol kg-1
>moles_of_phosphate_per_unit_mass_in_sea_water:mol kg-1
>moles_of_silicate_per_unit_mass_in_sea_water:mol kg-1
>omnidirectional_photosynthetic_spherical_irradiance_in_sea_water:W m-2
>omnidirectional_spectral_spherical_irradiance_in_sea_water:W m-3
>optical_thickness_of_atmosphere_layer_due_to_aerosol:1
>r:Pa
>scattering_angle:rad
>speed_of_sound_in_sea_water:m s-1
>surface_carbon_dioxide_partial_pressure_difference_between_air_and_sea_wate
>surface_partial_pressure_of_carbon_dioxide_in_air:Pa
>surface_partial_pressure_of_carbon_dioxide_in_sea_water:Pa
>surface_upwelling_radiance_in_sea_water:W m-2 sr-1
>surface_upwelling_spectral_radiance_in_sea_water:W m-2 m-1 sr-1
>volume_absorption_coefficient_of_radiation_in_sea_water:m-1
>volume_absorption_coefficient_of_radiation_in_sea_water_due_to_dissolved_organic_matter:m-1
>volume_attenuation_coefficient_of_radiation_in_sea_water:m-1
>volume_backwards_scattering_coefficient_of_radiation_in_sea_water:m-1
>volume_mixing_ratio_of_oxygen_at_stp_in_sea_water:1
>volume_scattering_coefficient_of_radiation_in_sea_water:m-1
>volume_scattering_function_of_radiation_in_sea_water:m-1 sr-1
>
>We have not yet finished the discussion about the platform_ standard names
>(in a separate email thread - see
>http://www.cgd.ucar.edu/pipermail/cf-metadata/2005/000739.html).
>
>Thanks for your help
>
>Cheers
>
>Jonathan
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*************************************************
Pepe S. D. Juevara
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*************************************************
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Received on Fri Sep 30 2005 - 10:08:53 BST
