How to lift dust on Mars: Greenhouse and thermophoretic effects in dust layers

Details How to lift dust on Mars: Greenhouse and thermophoretic effects in dust layers How to lift dust on Mars: Greenhouse and thermophoretic effects in dust layers

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf...75w&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

Abstract Illumination of the dusty surface of Mars by sunlight leads to positive temperature gradients within the topmost surface layers up to a maximum temperature below the surface (greenhouse effect, temperature increasing with depth). At the Martian surface the atmospheric pressure of several mbar is well suited that already small temperature gradients along dust particles lead to strong forces acting on the particles (thermophoresis). If these forces are stronger than gravity, dust eruptions are possible and dust particles get entrained into the atmosphere (GT-effect). This might explain dust being visible in dust devils as well as the initiation of global dust storm activity.

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