atmosphere_optical_thickness_due_to_ambient_aerosol_particles_assuming_clear_sky

under discussion

Created: 11 Jun 2025

Proposer: Tommi Bergman

Proposed Date: 2025-05-21

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Standard names: aerosol optical depths for clear sky, secondary organic and biomass burning aerosols (od550csaer, od550soa, od550bb)

Change Date: 11 Jun 2025, 9:50 a.m.

atmosphere_optical_thickness_due_to_ambient_aerosol_particles_assuming_clear_sky 1
AOD from aerosols assuming cloud free fraction of gridbox if od550aer is for all-sky. 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. The atmosphere optical thickness applies to radiation passing through the entire atmosphere. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the 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. Phrase "assuming_cloud_free" means the cloud free fraction of the grid box.

Change Date: 11 Jun 2025, 9:50 a.m.

atmosphere_optical_thickness_due_to_ambient_aerosol_particles_assuming_clear_sky 1 [XXXX]
AOD from aerosols assuming cloud free fraction of gridbox if od550aer is for all-sky. 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. The atmosphere optical thickness applies to radiation passing through the entire atmosphere. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the 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. Phrase "assuming_cloud_free" means the cloud free fraction of the grid box.