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HCl in rocket exhaust clouds - Atmospheric dispersion, acid aerosol characteristics, and acid rain depositionBoth measurements and model calculations of the temporal dispersion of peak HCl (g + aq) concentration in Titan III exhaust clouds are found to be well characterized by one-term power-law decay expressions. The respective coefficients and decay exponents, however, are found to vary widely with meteorology. The HCl (g), HCl (g + aq), dewpoint, and temperature-pressure-altitude data for Titan III exhaust clouds are consistent with accurately calculated HCl/H2O vapor-liquid compositions for a model quasi-equilibrated flat surface aqueous aerosol. Some cloud evolution characteristics are also defined. Rapid and extensive condensation of aqueous acid clearly occurs during the first three min of cloud rise. Condensation is found to be intensified by the initial entrainment of relatively moist ambient air from lower levels, that is, from levels below eventual cloud stabilization. It is pointed out that if subsequent dilution air at stabilization altitude is significantly drier, a state of maximum condensation soon occurs, followed by an aerosol evaporation phase.
Document ID
19830047480
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pellett, G. L.
(NASA Langley Research Center Hampton, VA, United States)
Sebacher, D. I.
(NASA Langley Research Center Hampton, VA, United States)
Bendura, R. J.
(NASA Langley Research Center Hampton, VA, United States)
Wornom, D. E.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1983
Publication Information
Publication: Air Pollution Control Association
Subject Category
Environment Pollution
Accession Number
83A28698
Distribution Limits
Public
Copyright
Other

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