Observations from the High Resolution Imaging Science Experiment (HiRISE): Martian dust devils in Gusev and Russell craters

被引:24
|
作者
Verba, Circe A. [1 ,2 ]
Geissler, Paul E. [1 ]
Titus, Timothy N. [1 ]
Waller, Devin [3 ]
机构
[1] US Geol Survey, Flagstaff, AZ 86001 USA
[2] US DOE, NETL, Albany, OR 97322 USA
[3] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
关键词
MARS; CAMERA;
D O I
10.1029/2009JE003498
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Two areas targeted for repeated imaging by detailed High Resolution Imaging Science Experiment (HiRISE) observations allow us to examine morphological differences and monitor seasonal variations of Martian dust devil tracks at two quite different locations. Russell crater (53.3 degrees S, 12.9 degrees E) is regularly imaged to study seasonal processes including deposition and sublimation of CO2 frost. Gusev crater (14.6 degrees S, 175.4 degrees E) has been frequently imaged in support of the Mars Exploration Rover mission. Gusev crater provides the first opportunity to compare "ground truth" orbital observations of dust devil tracks to surface observations of active dust plumes. Orbital observations show that dust devil tracks are rare, forming at a rate <1/110 that of the occurrence of active dust plumes estimated from Spirit's surface observations. Furthermore, the tracks observed from orbit are wider than typical plume diameters observed by Spirit. We conclude that the tracks in Gusev are primarily formed by rare, large dust devils. Smaller dust devils fail to leave tracks that are visible from orbit, perhaps because of limited surface excavation depths. Russell crater displays more frequent, smaller sinuous tracks than Gusev. This may be due to the thin dust cover in Russell, allowing smaller dust devils to penetrate through the bright dust layer and leave conspicuous tracks. The start of the dust devil season and peak activity are delayed in Russell in comparison to Gusev, likely because of its more southerly location. Dust devils in both sites travel in directions consistent with general circulation model (GCM)-predicted winds, confirming a laboratory-derived approach to determining dust devil travel directions based on track morphology.
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页数:11
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