NOAA’s data base for aerosol backscattering at λ = 10.6 µm since May 1981, in Boulder, Colorado, is presented together with seasonally averaged profiles and statistical analyses. Studies of the El Chichón event are included.
Madison J. Post, "Aerosol backscattering profiles at CO2 wavelengths: the NOAA data base," Appl. Opt. 23, 2507-2509 (1984)