Accession Number : ADA018372

Title :   Balloon Measurements of Stratospheric Aerosol Size Distribution Following a Volcanic Dust Incursion.

Descriptive Note : Final rept. 1 Oct 74-31 Aug 75,

Corporate Author : EPSILON LABS INC BEDFORD MASS

Personal Author(s) : Miranda,Henry A. , Jr. ; Dulchinos,John

Report Date : AUG 1975

Pagination or Media Count : 57

Abstract : Stratospheric aerosol size distribution measurements of the volcanic dust layer over Southeastern New Mexico, obtained on a balloon flight on January 21/22, 1975 several months following the Fuego volcanic eruption, are presented and discussed in preliminary fashion. Altitude profiles of all particles broken down into a set of contiguous size ranges indicate the presence of a pronounced concentration peak in the 16-21 Km region. Above this layer a distinct plateau is seen to exist between 22 and 26 Km which appears to be absent at night. This suggests the possibility of sunlight nucleation effects occurring in this altitude regime. A sunrise nucleation experiment conducted above this plateau region at 28 Km shows no evidence of nucleation during the first 1/2 hour following local sunrise. A distinct altitude-dependent size distribution slope in the 23-27 Km region which had been observed on a series of previous flight in May of 1973, appears to have been shifted to higher altitudes (26-28 Km) and is somewhat less pronounced.

Descriptors :   *Aerosols, *Stratosphere, Particle size, Volcanoes, Dust, Cosmic rays, Balloon equipment, Spectrum analysis, Computer programs, New Mexico, FORTRAN

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE