Balloon Measurements of Stratospheric Aerosol Size Distribution Following a Volcanic Dust Incursion.
Final rept. 1 Oct 74-31 Aug 75,
EPSILON LABS INC BEDFORD MASS
Pagination or Media Count:
Stratospheric aerosol size distribution measurements of the volcanic dust layer over Southeastern New Mexico, obtained on a balloon flight on January 2122, 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 12 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.
- Atmospheric Physics