volume_spectral_extinction_coefficient_in_air_due_to_ambient_aerosol_particles
rejected
Created: March 22, 2016
Proposer: Daniel Feldman / Robert Pincus
Proposed Date: 2015-07-17
CMIP6 - RFMIP. 9. CMIP6 short name aerext. We agreed to use the existing name volume_extinction_coefficient_in_air_due_to_ambient_aerosol_particles.
Change Date: March 22, 2016, 10:38 a.m.
Term: volume_spectral_extinction_coefficient_in_air_due_to_ambient_aerosol_particles
Unit: 1
Unit ref: UUUU
AMIP:
GRIB:
The aerosol optical property of extinction for our benchmark radiative transfer calculations. We chose this name to indicate that this quantity can vary spectrally and thus is distinct from the existing variable "volume_extinction_coefficient_in_air_due_to_ambient_aerosol". (In our original request, this variable was specified by the Short name "aerext").
Change Date: May 29, 2018, 1:19 p.m.
Term: volume_spectral_extinction_coefficient_in_air_due_to_ambient_aerosol_particles
Unit: 1
Unit ref: UUUU
AMIP:
GRIB:
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. 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. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature".