On the role of metal silicate molecules as ice nuclei

Details On the role of metal silicate molecules as ice nuclei On the role of metal silicate molecules as ice nuclei

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.2192p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 14-15, p. 2192-2200.

Physics

2

Scientific paper

Meteoric ablation injects similar quantities of Fe, Mg and Si vapours into the upper mesosphere; these vapours recondense to form meteoric smoke particles. Electronic structure theory is used to argue that the metal silicate molecules, FeSiO 3 and MgSiO 3 , should form in the upper atmosphere. These molecules, which may be regarded as the smallest smoke particles, have extremely large electric dipole moments of 9.5 and 12.2 Debye, respectively. H 2 O molecules therefore bind very effectively to them, with free energy changes in excess of -100 kJ mol -1 . Indeed, the addition of up to 8H 2 Os occurs more favourably than the sublimation of H 2 O to bulk ice. FeSiO 3 and MgSiO 3 should therefore nucleate ice particles under polar mesospheric conditions at temperatures around 140 K. These silicates should form readily and are shown to be stable in the mesosphere. Their daily production should be between 2000 and 8000 cm -3 around 85 km, which is sufficient to compete with transport out of the polar mesosphere by the meridional circulation.

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