Description: Work performed between July 1991 and June 1994 is very briefly summarized in this report. The work done concerns differences between clouds and the aerosol particles, or cloud condensation nuclei (CCN), upon which the cloud droplets condense. In particular, the substantial contribution of anthropogenic sources to CCNs and their effects on clouds were examined. Ship board measurements of CCN concentrations in clouds were taken in July 1991. In June 1992, aircraft measurements and analyses of CCN concentrations showed substantial influences of anthropogenic aerosol on clouds through long-range transport of polluted air. A June 1994 study indicated that CCN produced by ships caused ship trail clouds even in moderately polluted clouds.
Date: November 1997
Creator: Hudson, J. G.
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