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Summary: monthly averages also results from the natural vari-
ability when few measurements are available.
24. G. F. Herman, J. Curry, J. Clim. Appl. Meteorol. 23, 5
(1984).
25. D. TanreŽ et al., Geophys. Res. Lett., 28, 4555 (2001).
26. Each point in Fig. 3 shows the average of individual
CDR measurements that correspond to a given bin of
aerosol load estimates. Because there is a significant
uncertainty on the aerosol load, this average is de-
rived from cases with actual loads that may be higher
or lower than the bin value. For the lowest load bin,
only higher loads (smaller CDR) contaminate the
estimate. This tends to decrease the average CDR all
the more that the uncertainty on the aerosol load is
larger.
27. G. Feingold et al., J. Geophys. Res. 106, 22907
(2001).
28. Because the curve as a function of optical thickness
(green) is significantly above that as a function of
aerosol index (blue), one may get the false impres-
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