Carbon Dioxide Snow Storms During the Polar Night on Mars

Mathematics – Logic

Scientific paper

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Carbon Dioxide, Snow, Storms, Night, Polar Caps, Mars (Planet), Mars Atmosphere, Mars Surface, Structural Properties (Geology), Cap Clouds, Simulation

Scientific paper

The Mars Orbiter Laser Altimeter (MOLA) detected clouds associated with topographic features during the polar night on Mars. While uplift generated from flow over mountains initiates clouds on both Earth and Mars, we suggest that the Martian clouds differ greatly from terrestrial mountain wave clouds. Terrestrial wave clouds are generally compact features with sharp edges due to the relatively small particles in them. However, we find that the large mass of condensible carbon dioxide on Mars leads to clouds with snow tails that may extend many kilometers down wind from the mountain and even reach the surface. Both the observations and the simulations suggest substantial carbon dioxide snow precipitation in association with the underlying topography. This precipitation deposits CO2, dust and water ice to the polar caps, and may lead to propagating geologic features in the Martian polar regions.

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