Folks: resending a post hoping someone can help me. see below.
very respectfully, randy On Apr 18, 2013, at 2:01 PM, [email protected] wrote: > > > Folks: > > The current definition for "atmosphere_optical_thickness_due_to_cloud" in the > current standard name table is: > > The optical thickness is the integral along the path of radiation of a > volume scattering/absorption/attenuation coefficient. The radiative flux > is reduced by a factor exp(-optical_thickness) on traversing the path. A > coordinate variable of radiation_wavelength or radiation_frequency can > be specified to indicate that the optical thickness applies at specific > wavelengths or frequencies. The atmosphere optical thickness applies to > radiation passing through the entire atmosphere. The specification of a > physical process by the phrase due_to_process means that the quantity > named is a single term in a sum of terms which together compose the > general quantity named by omitting the phrase. > > > There are other "atmospheric_optical_thickness_due_to_<process>" standard > names in the table, and they all have a clarifying sentence about the > "<process>" part. The definition for > "atmosphere_optical_thickness_due_to_cloud" does not have a clarifying > sentence for what a cloud means. > > Is this a mistake ? > > If so, maybe the following changes should be made to the standard name table: > > (1) > Add a standard_name "atmosphere_optical_thickness" and use the current > definition for "atmosphere_optical_thickness_due_to_cloud" as identified > above. > > (2) > Change the definition of "atmosphere_optical_thickness_due_to_cloud" to be: > > The optical thickness is the integral along the path of radiation of a > volume scattering/absorption/attenuation coefficient. The radiative flux > is reduced by a factor exp(-optical_thickness) on traversing the path. A > coordinate variable of radiation_wavelength or radiation_frequency can > be specified to indicate that the optical thickness applies at specific > wavelengths or frequencies. The atmosphere optical thickness applies to > radiation passing through the entire atmosphere. "Cloud" means the > component of extinction owing to the presence of liquid or ice water > particles. The specification of a physical process by the phrase > due_to_process means that the quantity named is a single term in a sum > of terms which together compose the general quantity named by omitting > the phrase. > > very respectfully, > > randy > > > > > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ____________________________________ Randy C. Horne ([email protected]) Principal Engineer, Excalibur Laboratories Inc. voice & fax: (321) 952.5100 url: http://www.excaliburlabs.com
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