Kinetics of ice particles growth in the polar summer mesosphere

Details Kinetics of ice particles growth in the polar summer mesosphere Kinetics of ice particles growth in the polar summer mesosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa21b..01z&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA21B-01

Physics

0340 Middle Atmosphere: Composition And Chemistry, 1011 Thermodynamics (0766, 3611, 8411), 3360 Remote Sensing

Scientific paper

The growth kinetics of ice particles in the polar summer mesosphere is discussed. The particle growth time is calculated using the temperature, water vapor density, and ice number density simultaneously measured by the infrared Fourier Transform Spectrometer on the Atmospheric Chemistry Experiment (ACE-FTS) satellite. The formation rate for ice particles is a very strong function of temperature and water vapor concentration. We found the equilibrium radius of ice particles to be in the range from 20 to 70 nm, and the formation time - from about 2 hours at 150 K to about 18 hours at 125 K. Our results imply that in addition to the commonly accepted particle growth during their sedimentation from higher altitudes, in-situ growth to radii of 50-70 nm at mesospheric temperatures near 150 K in two hours or less may also be possible. Our analysis of possible shapes for mesospheric ice particles using the band shape of ice absorption feature measured by ACE-FTS suggests that cubes or compact hexagonal prisms (with an aspect ratio of 1.1) are the best candidates to represent the crystalline ice particles in the polar summer mesosphere.

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