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Stratospheric sulfuric acid fraction and mass estimate for the 1982 volcanic eruption of El ChichonThe stratospheric sulfuric acid fraction and mass for the 1982 volcanic eruptions of El Chichon are investigated using data from balloon soundings at Laramie (41 deg N) and in southern Texas (27-29 deg N). The total stratospheric mass of these eruptions is estimated to be approximately 8 Tg about 6.5 months after the eruption with possibly as much as 20 Tg in the stratosphere about 45 days after the eruption. Observations of the aerosol in Texas revealed two primary layers, both highly volatile at 150 C. Aerosol in the upper layer at about 25 km was composed of an approximately 80 percent H2SO4 solution while the lower layer at approximately 18 km was composed of a 60-65 percent H2SO4 solution aerosol. It is calculated that an H2SO4 vapor concentration of at least 3 x 10 to the 7th molecules/cu cm is needed to sustain the large droplets in the upper layer. An early bi-modal nature in the size distribution indicates droplet nucleation from the gas phase during the first 3 months, while the similarity of the large particle profiles 2 months apart shows continued particle growth 6.5 months after the explosion.
Document ID
19830047694
Document Type
Reprint (Version printed in journal)
Authors
Hofmann, D. J. (Wyoming Univ. Laramie, WY, United States)
Rosen, J. M. (Wyoming, University Laramie, WY, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1983
Publication Information
Publication: Geophysical Research Letters
Volume: 10
ISSN: 0094-8276
Subject Category
GEOPHYSICS
Report/Patent Number
AD-A145960
Distribution Limits
Public
Copyright
Other