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Regression of the Mountains of Mitchel polar ice after the onset of a global dust storm on Mars
Author(s) -
Bonev Boncho P.,
James Philip B.,
Bjorkman Jon E.,
Wolff Michael J.
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015458
Subject(s) - dust storm , mars exploration program , orbiter , storm , atmospheric sciences , sublimation (psychology) , radiative transfer , astrobiology , atmospheric dust , environmental science , snow , atmospheric radiative transfer codes , geology , meteorology , physics , astronomy , aerosol , psychology , psychotherapist , quantum mechanics
Data from the Mars Orbiter Camera experiment on Mars Global Surveyor show that the 2001 spring regression of the Mountains of Mitchel, a bright region in the south polar cap of Mars, was faster than in 1999. Those two years differed in that a large spring dust storm occurred in 2001, while 1999 was relatively dust free. We have modeled the effects of atmospheric dust on the CO 2 sublimation rate, using a Monte Carlo radiative transfer model. We explicitly accounted for the two major effects of atmospheric dust: 1) reduction of the direct solar heating and 2) the opposing increase in the absorption of IR thermal dust emission by the surface. Our modeling supports the hypothesis that this year's faster regression of the Mountains of Mitchel was related to the early spring global dust storm.