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 <[email protected]
<mailto:[email protected]>> 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:[email protected]
_______________________________________________
CF-metadata mailing list
[email protected] <mailto:[email protected]>
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:[email protected]
_______________________________________________
CF-metadata mailing list
[email protected]
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: [email protected]
_______________________________________________
CF-metadata mailing list
[email protected]
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
