Hi-
I've not seen any follow-up discussions to my posting of several days'
ago, and was wondering what
is thought of the proposal below.
Sincerely,
Gary Meehan
On 1/10/2014 1:34 PM, Gary Meehan wrote:
> Dear CF Board,
>
> I wish to close the loop on this subject held a few weeks back, in
> which I proposed amending the definition
> to the standard name, atmosphere_optical_thickness_due_to_cloud, by
> introducing the following clarification
> sentence:
>
> "Cloud" means the component of extinction owing to the presence of
> liquid or ice water particles.
>
> John Graybeal affirmed this proposal, but I am not sure if this is
> considered to still be an open issue. John raised
> an excellent point, questioning if 'cloud' should be considered to be
> a process. Perhaps this can be circumvented
> by amending the last sentence to read:
>
> The quantity named may be considered a single term in a sum of terms
> which, together, compose the general quantity,
> atmosphere_optical_thickness.
>
> Thus, removing the concept of a process, altogether.
>
> Sincerely,
>
> Gary Meehan
>
> On 12/19/2013 1:59 PM, John Graybeal wrote:
>> All of this makes sense to me.
>>
>> It prompts me to ask: Is 'cloud' actually a process? Or should the
>> standard due_to definition clause be updated to include process or
>> substance?
>>
>> John
>>
>> On Dec 19, 2013, at 09:49, Gary Meehan <gmeehan at aer.com
>> <mailto:gmeehan at aer.com>> wrote:
>>
>>> Dear CF board,
>>>
>>> I would like to close the loop on a question posed this past April
>>> pertaining to the definition associated with the standard name,
>>> atmosphere_optical_thickness_due_to_cloud. At the time, it was
>>> observed by the original poster that the definition of this standard
>>> name does not make a connection to the presence of cloud
>>> contributing to the atmosphere optical thickness quantity. As a
>>> result, it was
>>> proposed that the definition of this standard name be amended by
>>> introducing the sentence "Cloud means the component
>>> of extinction owing to the presence of liquid or ice water
>>> particles." The definition of this standard name, in its entirety,
>>> would thus read as follows:
>>>
>>> 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.
>>>
>>> The goal of re-posting this question to the Board is to inquire if
>>> it feels that an update to the definition is warranted, and if
>>> the proposed wording is thus acceptable. Updating the definition in
>>> this manner would make it consistent with the definitions
>>> of the other atmosphere_optical_thickness_due_to_<process> standard
>>> names.
>>>
>>> Sincerely,
>>>
>>> Gary
>>> --
>>> Gary Meehan
>>> Senior Staff Scientist
>>> Atmospheric and Environmental Research
>>> 131 Hartwell Avenue, Lexington, MA 02421-3126
>>> Tel (781) 761-2228 . Fax (781) 761-2299
>>> e-mail:gmeehan at aer.com
>>> _______________________________________________
>>> CF-metadata mailing list
>>> CF-metadata at cgd.ucar.edu <mailto:CF-metadata at cgd.ucar.edu>
>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>> ------------------------------------
>> *John Graybeal*
>> Sr. Data Manager, Metadata & Semantics
>>
>> M +1 408 675-5445
>> skype: graybealski
>> Marinexplore
>> 920 Stewart Drive
>> Sunnyvale 94085
>> California, USA
>> www.marinexplore.com <http://marinexplore.com>
>>
>
>
> --
> Gary Meehan
> Senior Staff Scientist
> Atmospheric and Environmental Research
> 131 Hartwell Avenue, Lexington, MA 02421-3126
> Tel (781) 761-2228 . Fax (781) 761-2299
> e-mail:gmeehan at aer.com
>
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
--
Gary Meehan
Senior Staff Scientist
Atmospheric and Environmental Research
131 Hartwell Avenue, Lexington, MA 02421-3126
Tel (781) 761-2228 . Fax (781) 761-2299
e-mail: gmeehan at aer.com
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