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Results

Figures 1 and 2 show the aerosol optical thicknesses in the morning and in the afternoon during the campaign at the 5 wavelengths. t _ae ranges from 0.1 to 3.75 with larger values in the afternoon. Uncertainty ranges up to 0.8 and larger aerosol optical thickness seems to carry larger uncertainty values. Large variability can be seen both in the morning and in the afternoon.

Figure 3 shows typical optical thicknesses as a function of wavelength for the afternoon of the julian day 215 (Aug 3), 1999 in Campo Grande. t _R , and t _O3 are the largest components of the atmospheric optical thicknesses, but for wavelengths larger than about 314 nm. There is a weak dependence of aerosol optical thickness on wavelength, and t _SO2 is the smallest optical thickness.