Physics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2303t&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 18, p. 2303-2306
Physics
36
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Waves And Tides
Scientific paper
Results from laboratory experiments and microphysical modeling are presented that suggest a potential freezing nucleation mechanism for polar stratospheric cloud (PSC) particles above the water ice frost point (Tice). The mechanism requires very high HNO3 concentrations of about 58 wt% in the droplets, and leads to the freezing of nitric acid dihydrate (NAD) in a highly selective manner in the smallest droplets of an ensemble. In the stratosphere such liquid compositions are predicted to occur in aerosol droplets which are warmed adiabatically with rates of about +150K/h from below 190 K to 194 K. Such rapid temperature changes have been observed in mountain leewaves that occur frequently in the stratosphere, clearly demonstrating the need for a stratospheric gravity wave climatology.
Carslaw Kenneth S.
Luo B. P.
Onasch T. P.
Peter Th.
Prenni Anthony J.
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