Aerosols in the Air
NASA/JPL/University of Arizona
Aerosols in the Air
ESP_020163_0980  Science Theme: Seasonal Processes
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HiRISE images are monochromatic across much of the scene, but in the center we return color data. The color strip down the center of this image gives us insight into aerosols (particles of dust and frost) suspended in the atmosphere and the seasonal processes that get them there.

In the winter Mars' South polar region is covered by a layer of carbon dioxide ice (dry ice). In the spring this ice evaporates from the top and the bottom of the seasonal ice layer (typically tens of centimeters thick). Where there are cracks in the ice the gas from below escapes, carrying fine particles from the surface up to the top of the ice. Larger particles fall back onto the ground in fan-shaped deposits pointing in a direction determined by the local winds.

We see the smaller particles (dust) suspended in the air locally over the cracks as the bluish tone over the regions with fans. Over regions without fans, where gas and dust from the surface are not escaping into the atmosphere, the surface is a more pinkish tone.

Written by: Candy Hansen   (5 January 2011)

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Acquisition date:14 November 2010 Local Mars time:16:58
Latitude (centered):-81.692° Longitude (East):66.308°
Range to target site:248.5 km (155.3 miles)Original image scale range:99.4 cm/pixel (with 4 x 4 binning) so objects ~298 cm across are resolved
Map projected scale:100 cm/pixelMap projection:Polarstereographic
Emission angle:2.5° Phase angle:85.4°
Solar incidence angle:87°, with the Sun about 3° above the horizon Solar longitude:181.1°, Northern Autumn

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