Seasonal modulation of water and dust cycles in the martian atmosphere by planetary waves synchronization

Physics

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Scientific paper

GCM simulations of the Martian annual dust and water cycles, including microphysical and radiative processes in ice clouds, are employed to explore the relative contribution of various transport channels and parametric sensitivity of the modeled climate system. Comparison with observations implies that better agreement is achieved with the presence of a fine fraction of dust with negligible column opacity, which contributes to solar heating at the altitudes above 0.2 mbar, and provides nucleation cores for cloud formation at these altitudes. Simulations also suggest that in the solstice seasons, stable, globally synchronized stationary and slowly propagating wave structures are developed in the midlatitude jets and polar vortices. Seasonally determined reconfiguration of these waves triggers signifcant enhancement of the meridional transport, that contributes to both water and dust cycles.

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