Record Label : mass_fraction_of_pm2p5_ambient_aerosol_particles_in_air
Record Title : Mass Fraction of Pm2P5 Ambient Aerosol Particles in Air
CF Standard Name : mass_fraction_of_pm2p5_ambient_aerosol_particles_in_air
Record Description : Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). A chemical species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "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. "Pm2p5 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 2.5 micrometers. To specify the relative humidity and temperature at which the particle size applies, provide scalar coordinate variables with the standard names of "relative_humidity" and "air_temperature".
Canonical Units : 1
MIP Variable : PM2.5 Mass Mixing Ratio in Lowest Model Layer