Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2197m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2197
Other
Scientific paper
Aerosol particles are an important factor in planetary atmospheres. In the Martian atmosphere dust and other types of aerosol particles (most importantly carbon dioxide and water ices) scatter and absorb both short- and longwave radiation. This affects the thermal structure of the atmosphere and flow fields therein. Flow patterns affect the aerosol particle distribution by lifting dust from the surface and advecting dust and ice particles in the atmosphere. This feedback between aerosols and flow patterns may, for example, have a great influence in giving rise to global (and also local) dust storms. Our goal is to build an aerosol model for the Martian atmosphere by partly converting an existing aerosol model, which describes aerosols in the atmosphere of the Earth, into Martian conditions, and partly building new pieces into the model based on work done before. We have studied homogeneous and heterogeneous nucleation of carbon dioxide based on the work by Wood (1999). Water ice nucleation will also be studied in the same way. The possibilities of the nucleation of the hydrate clathrate formed by carbon dioxide and water will also be investigated. Future work includes modelling the growth of the aerosol particles by condensation and coagulation using the schemes of the existing aerosol model. Eventually, when all the components are together and working, the aerosol model will be implemented into the Mars atmospheric models of the University of Helsinki. Thus the aerosol model will be improving the atmospheric models by, for example, describing cloud formation and aerosol distribution more precisely and thus improving the accuracy of the radiation schemes.
Korhonen Heidi
Kulmala Markku
Lehtinen Kimmo K.
Määttänen Anni
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