Meteoric smoke particles; a model study of microphysical properties and global distribution

Details Meteoric smoke particles; a model study of microphysical properties and global distribution Meteoric smoke particles; a model study of microphysical properties and global distribution

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21b..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA21B-07

Physics

0305 Aerosols And Particles (0345, 4801, 4906), 0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334)

Scientific paper

Meteoric material reaching the Earth ablates in the 80-100 km region and is believed to be the major source of so-called "smoke particles". These are thought to play a major role in a host of atmospheric phenomena such as noctilucent clouds, polar mesosphere summer echoes, metal atom layers, and heterogeneous chemistry controlling key atmospheric species such as water vapour. Despite their obvious scientific importance, only little is known about their actual properties. Motivated by the recent first experimental proof of the existence of these particles in the course of the MAGIC project (MAGIC = Mesospheric Aerosol: Genesis, Interaction and Composition), we here present a systematic model study of the properties of mesospheric smoke particles. We investigate the sensitivity of particle properties and their spatial distribution on parameters such as the magnitude of the meteoric influx, microphysical parameters controlling particle coagulation, and vertical transport. The study is carried out using the 1D CARMA model (CARMA = Community Aerosol and radiation Model for Atmospheres). Current work involves combining the CARMA model with a 2D chemical transport model (CHEM2D) to study transport of smoke particles by the meridional circulation. The global smoke distribution is particulary interesting in the light of recent experimental findings. Preliminary results from this work will also be presented"

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