Northern Dunes Covered by Seasonal Dry Ice
NASA/JPL/University of Arizona
Northern Dunes Covered by Seasonal Dry Ice
ESP_016190_2635  Science Theme: Seasonal Processes
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Dark sand dunes at high Northern latitudes on Mars are covered seasonally by a layer of condensed carbon dioxide (dry ice), visible in this image.

When the sun rises in the spring the ice begins to sublimate. Gas flow from the bottom of the ice layer propels sand from the dunes out through cracks to the top of the ice and down the dune slipface forming the dark streaks seen in this image.

Written by: Candy Hansen   (3 February 2011)

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Acquisition date:09 January 2010 Local Mars time:13:13
Latitude (centered):83.514° Longitude (East):118.561°
Range to target site:319.7 km (199.8 miles)Original image scale range:32.0 cm/pixel (with 1 x 1 binning) so objects ~96 cm across are resolved
Map projected scale:25 cm/pixelMap projection:Polarstereographic
Emission angle:0.1° Phase angle:69.7°
Solar incidence angle:70°, with the Sun about 20° above the horizon Solar longitude:35.3°, Northern Spring

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