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Homogeneous freezing nucleation of stratospheric solution dropletsThe classical theory of homogeneous nucleation was used to calculate the freezing rate of sulfuric acid solution aerosols under stratospheric conditions. The freezing of stratospheric aerosols would be important for the nucleation of nitric acid trihydrate particles in the Arctic and Antarctic stratospheres. In addition, the rate of heterogeneous chemical reactions on stratospheric aerosols may be very sensitive to their state. The calculations indicate that homogeneous freezing nucleation of pure water ice in the stratospheric solution droplets would occur at temperatures below about 192 K. However, the physical properties of H2SO4 solution at such low temperatures are not well known, and it is possible that sulfuric acid aerosols will freeze out at temperatures ranging from about 180 to 195 K. It is also shown that the temperature at which the aerosols freeze is nearly independent of their size.
Document ID
19910071867
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jensen, Eric J.
(NASA Ames Research Center Moffett Field, CA, United States)
Toon, Owen B.
(NASA Ames Research Center Moffett Field, CA, United States)
Hamill, Patrick
(San Jose State University CA, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1991
Publication Information
Publication: Geophysical Research Letters
Volume: 18
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
91A56490
Distribution Limits
Public
Copyright
Other

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