[CF-metadata] New standard name: volume_extinction_coefficient_in_air_due_to_cloud

From: Bodas-Salcedo, Alejandro <alejandro.bodas>
Date: Thu, 6 Feb 2014 13:33:11 +0000

Dear Markus,

Thanks for your comment. Happy to follow the outcome of the previous discussion, so the name would be:

volume_extinction_coefficient_in_air_due_to_cloud_particles
Units: m-1

Updated definition:
The volume extinction coefficient is the fractional change of radiative flux per unit path length. Extinction is the sum of absorption and scattering, sometimes called "attenuation". "Extinction" is the term most commonly used at optical wavelengths whereas "attenuation" is more often used at radio and radar wavelengths. "Cloud" means suspended liquid or ice water droplets. A coordinate of radiation_wavelength or radiation_frequency should be included to specify either the wavelength or frequency.

Regards,

Alejandro

> -----Original Message-----
> From: Fiebig, Markus [mailto:Markus.Fiebig at nilu.no]
> Sent: Thursday, February 06, 2014 12:10 PM
> To: Bodas-Salcedo, Alejandro; 'cf-metadata at cgd.ucar.edu'
> Subject: Re: [CF-metadata] New standard name:
> volume_extinction_coefficient_in_air_due_to_cloud
>
> Dear Alejandro,
>
> just one small comment.
>
> We had recently a long discussion concerning wording of a few
> aerosol variables,
> and some results of that discussion would also be relevant
> for your proposed
> variable. You should probably substitute "cloud" with
> "cloud_particles".
> Otherwise, it isn't clear whether you refer only to the cloud
> particle phase, or
> to the whole system of particles and air. Also, you probably
> want to require a
> co-ordinate variable "wavelength" in the definition.
>
> Best regards,
> Markus
>
> Am 06.02.2014 10:54, schrieb Bodas-Salcedo, Alejandro:
> > Dear CF list,
> >
> > I'd like to propose the following standard name:
> >
> > volume_extinction_coefficient_in_air_due_to_cloud
> > Units: m-1
> >
> > Definition, following the aerosol extinction coefficient:
> > The volume extinction coefficient is the fractional change
> of radiative flux per unit path length. Extinction is the sum
> of absorption and scattering, sometimes called "attenuation".
> "Extinction" is the term most commonly used at optical
> wavelengths whereas "attenuation" is more often used at radio
> and radar wavelengths. "Cloud" means suspended liquid or ice
> water droplets.
> >
> > Regards,
> >
> > Alejandro
> >
>
> --
> Dr. Markus Fiebig
> Senior Scientist
> Dept. Atmospheric and Climate Research (ATMOS)
> Norwegian Institute for Air Research (NILU)
> P.O. Box 100
> N-2027 Kjeller
> Norway
>
> Tel.: +47 6389-8235
> Fax : +47 6389-8050
> e-mail: Markus.Fiebig at nilu.no
> skype: markus.fiebig
>
>
Received on Thu Feb 06 2014 - 06:33:11 GMT