HiRISE | Color Reveals Translucent Seasonal Ice (PSP_002942

NASA/JPL/University of Arizona

Color Reveals Translucent Seasonal Ice
PSP_002942_0935 Science Theme: Seasonal Processes

This caption is part of a December 2007 AGU presentation "Spring at the South Pole of Mars."

In a region near the south pole of Mars translucent carbon dioxide ice covers the ground seasonally. For the first time we can "see" the translucent ice by the effect it has on the appearance of the surface below.

Dark fans of dust from the surface drape over the top of the seasonal ice. The surface would be the same color as the dust except that the seasonal ice affecting its appearance. Bright bluish streaks are frost that has re-crystallized from the atmosphere.

Sunlight can penetrate through the seasonal layer of translucent ice to warm the ground below. That causes the seasonal ice layer to sublime (evaporate) from the bottom rather than the top.

Written by: Candy Hansen (18 December 2007)

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Acquisition date:	13 March 2007	Local Mars time:	6:41 PM
Latitude (centered):	-86.397 degrees	Longitude (East):	99.150 degrees
Range to target site:	245.4 km (153.4 miles)	Original image scale range:	49.1 cm/pixel (with 2 x 2 binning) so objects ~147 cm across are resolved
Map projected scale:	50 cm/pixel	Map projection:	POLAR STEREOGRAPHIC
Emission angle:	2.3 degrees	Phase angle:	84.4 degrees
Solar incidence angle:	82 degrees, with the Sun about 8 degrees above the horizon	Solar longitude:	199.6 degrees, Northern Autumn
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North azimuth:	135 degrees	Sub-solar azimuth:	33.7 degrees
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North azimuth:	9.181 degrees	Sub solar azimuth:	268.2 degrees

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For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.