Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33c..08m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33C-08
Physics
0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry
Scientific paper
Particles dominantly composed of water are known to exist in the high latitude upper mesosphere during the summer months. However, the mechanism through which they nucleate remains unknown. In the past the homogeneous nucleation of ice directly from the vapour phase has been ruled out on the basis of homogeneous nucleation theory. It is postulated here that particles of amorphous water, ultra-viscous condensed water with a liquid like structure, may nucleate directly from the vapour phase in the summer mesosphere. It is demonstrated here that the energy barrier to nucleation of an amorphous water particle may be much smaller than that to nucleate a crystalline ice particle. These amorphous water particles may later crystallise to form cubic crystalline ice particles. It is concluded that homogeneous nucleation of amorphous water particles can not be ruled out as a potential mechanism of condensed water cloud formation in the upper mesosphere.
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