Stratospheric Particles. Size Distributions of Stratospheric Aerosols and their Variations with Altitude and Time.

摘要

A description is given of the variation with altitude and time of the size distributions and concentrations of stratospheric particles collected with impactors carried on 35 Australian balloon flights from latitude 34 Deg S. in the five years May 1969 to April 1974. Seasonal variations were found to be confined mainly to the lower stratosphere, where a winter maximum of small particles was followed by a spring maximum of large particles. Longer-term trends showed only one conspicuous feature, a decrease in concentration of about one order of magnitude in 1971. Former concentrations were restored by the beginning of 1972 by an increase commencing in late August 1971. The size distributions as a function of altitude were very similar to those obtained by Junge and his colleagues with balloon-borne equipment in the U.S.A. 10 years earlier and with those obtained in Wyoming, U.S.A. in 1972.