Mars 1064-nm Albedo Changes Seen by the MOLA Instrument, and the 2001 Dust Storm

Details Mars 1064-nm Albedo Changes Seen by the MOLA Instrument, and the 2001 Dust Storm Mars 1064-nm Albedo Changes Seen by the MOLA Instrument, and the 2001 Dust Storm

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p31a..03n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P31A-03

Physics

5415 Erosion And Weathering, 5470 Surface Materials And Properties

Scientific paper

Nearly 4 years of Mars radiometry measurements reveal a pronounced redistribution of surface albedo prior to and especially following the 2001 dust storm at 1064 nm. The Mars Orbiter Laser Altimeter (MOLA) continues to operate on board Mars Global Surveyor (MGS), now in its 5th Mars year, as a stable narrow-band radiometer. Its 2-nm wide spectral window lies on the shoulder of a pyroxene absorption band and provides a measurement similar to, but with better albedo contrast and higher spatial resolution than, the TES visible/NIR bolometer, the MOC WA camera, or remote telescopic observations. Changes of more than 50% in albedo occurred over Solis Planum following the 2001 global dust storm, reversing the pattern seen by Bell and coworkers from 1977-1997 in Viking and HST observations and by Geissler et al. using the red wide-angle camera on MGS. The MOLA results are consistent with an eastward transport of dust during the storm from bright to dark regions, followed by slow re-accumulation. These surface changes are reflected in daytime temperatures but are not resolved in thermal inertia. Martian dust transport provides a mechanism whereby the weather may deviate on decadal scales from an annual cycle forced by insolation.

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