OMI aerosol measurements: AI (OMI Aerosol Index)

The aerosol index is a measure of how much the wavelength dependence of backscattered UV radiation from an atmosphere containing aerosols (Mie scattering, Rayleigh scattering, and absorption) differs from that of a pure molecular atmosphere (pure Rayleigh scattering).

Quantitatively, the aerosol index AI is defined to be

AI = 100 log10( I360Meas / I360Calc )

where I360Meas = the measured 360 nm OMI radiance
and where I360Calc = the calculated 360 nm OMI radiance for a Rayleigh atmosphere

Under most conditions, the AI is positive for absorbing aerosols and negative for nonabsorbing aerosols (pure scattering).

© OMI -- Last update: Friday, 18-Oct-2013 12:40:12 UTC. --