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Denitrification mechanisms in the polar stratospheresMicrophysical simulations suggest that the time required for nitric acid particles to sediment from the stratosphere is comparable to the time required for falling ice particles to incorporate nitric acid vapor from the vapor phase. Since nitric acid particles form earlier in the winter than ice particles, these simulations favor denitrification being a separate process from dehydration, with denitrification being due to nitric acid particles and dehydration due to ice particles. In the simulations, the column abundance of nitric acid is only depleted if temperatures low enough for nitric acid particles to exist extend to the altitude above which the column is measured. Such low temperatures are infrequent in the Arctic lower stratosphere, which may be the main reason that the Arctic stratospheric column shows little loss of nitric acid during winter, while the colder Antarctic stratospheric column shows a substantial loss of nitric acid.
Document ID
19900041442
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Toon, Owen B.
(NASA Ames Research Center Moffett Field, CA, United States)
Turco, R. P.
(California, University Los Angeles, United States)
Hamill, P.
(San Jose State University CA, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Geophysical Research Letters, Supplement
Volume: 17
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
90A28497
Distribution Limits
Public
Copyright
Other

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