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Effect of the eruption of El Chichon stratospheric aerosol size and compositionDominant effects of the El Chichon eruption on stratospheric aerosols at 19.8 to 20.7 km are: (1) vapor depositional growth of the small-aerosol (background) mode; (2) development of a large-particle mode by sedimentation from the highest altitudes in the cloud; (3) a change in the large-particle mode from sulfate-coated silicates to sulfate aerosols, some with silicate cores; (4) a 100-fold increase in sulfate mass in the large particle mode. Terminal velocities of large silicate particles, maximum r = 2.3 micron, sampled 1 month after eruption, and calibrated with the aid of lidar data, indicate initial injection to 26 to 27 km. Smaller velocities of sulfate aerosols, median r = 0.5 micron, are compatible with major growth in 2 to 3 months at 27 to 28 km. Aerosol settling accounts for the descent of the main lidar return to 26.5 km in August and to 20 to 21 km in December.
Document ID
19840038622
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Oberbeck, V. R.
(NASA Ames Research Center Moffett Field, CA, United States)
Danielsen, E. F.
(NASA Ames Research Center Moffett Field, CA, United States)
Snetsinger, K. G.
(NASA Ames Research Center Moffett Field, CA, United States)
Ferry, G. V.
(NASA Ames Research Center Moffett Field, CA, United States)
Fong, W.
(Information Management International, Inc. San Jose, CA, United States)
Hayes, D. M.
(Environmental Analysis Laboratories, Corp. Richmond, CA, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1983
Publication Information
Publication: Geophysical Research Letters
Volume: 10
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
84A21409
Distribution Limits
Public
Copyright
Other

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