MRO CRISM Investigation of Hydrated Materials Associated with the North Polar Residual Cap on Mars

Details MRO CRISM Investigation of Hydrated Materials Associated with the North Polar Residual Cap on Mars MRO CRISM Investigation of Hydrated Materials Associated with the North Polar Residual Cap on Mars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p23a1089s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P23A-1089

Physics

5410 Composition (1060, 3672), 5422 Ices, 5462 Polar Regions, 5464 Remote Sensing, 6225 Mars

Scientific paper

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) onboard the Mars Reconnaissance Orbiter (MRO) is a visible and near infrared hyperspectral imager with 544 channels from 362 to 3920 nm (6.55 nm spectral sampling). The MRO Primary Science Phase (PSP) began at Ls ~ 130° allowing for significant data acquisition at the high northern latitudes in advance of deteriorating atmospheric and illumination conditions. As a result of early PSP science priorities and operational constraints, the majority of the CRISM data acquired at that time were multispectral survey (200 m/pxl; 73 channel) observations. This allowed for the generation of a nearly complete multispectral survey mosaic for the north polar residual cap and the surrounding terrain (>75° latitude). CRISM multispectral mapping mosaics and related analysis products for the high northern latitudes reveal hydrated material within a number of troughs and reentrants into the north polar residual cap, as inferred from the depth and spatial coherency of the 1.9 μm absorption band. Although the identification of the hydrated exposures occurred after the close of the observing season at the high northern latitudes, a limited number of CRISM hyperspectral targeted (20-40 m/pxl; 544 channel) and multispectral window (100 m/pxl; 73 channel) observations were acquired at these locations. The higher spatial resolution data show that the hydration signature is most commonly associated with low-albedo dunes -- both in the vicinity of the Olympia Undae gypsum-bearing sand sea, and in distant polar cap reentrants. The ongoing evaluation of high resolution hyperspectral CRISM observations of hydrated materials in the vicinity of the north polar residual cap and further refinement of the multispectral mapping spectral analysis products will contribute to the targeting and acquisition of additional CRISM observations in the upcoming full northern summer of MRO operations.

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