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Seasonal formation rates of martian slope streaks

Heyer, T. and Kreslavsky, M. and Hiesinger, H. and Reiss, D. and Bernhardt, H. and Jaumann, R (2019) Seasonal formation rates of martian slope streaks. Icarus, 323 (1), pp. 76-86. Elsevier. DOI: 10.1016/j.icarus.2019.01.010 ISSN 0019-1035

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Abstract

Slope streaks are gravity-driven dark or light-toned features that form throughout the martian year in high-albedo and low-thermal inertia equatorial regions on Mars. These distinctive features have never been observed in a terrestrial environment although some analogs have been proposed. Based on diverse orbital observations, a number of mechanisms including granular and aqueous flows have been proposed to explain their formation. Using multi-temporal images taken by the Context Camera (CTX) aboard the Mars Reconnaissance Orbiter (MRO), we identified newly formed streaks in multiple martian years and estimated seasonal streak formation rates at intermediate latitudes, as well as at the equator. We found seasonal variations in streak activity in multiple consecutive martian years, including high formation rates during autumn (solar longitude LS ~190°). During this time, slope streak activity exceeds the long-term formation rate multiple times. The highest seasonal formation rate of 0.16% per streak per martian day was observed in the Olympus Mons aureole in autumn (LS ~210°) of Mars year 30. In some sites, slope streak formation rate at slopes of opposite orientation peaks at different seasons. The seasonal variations of the formation rate are inconsistent with sporadic trigger mechanisms and revealed that changing conditions at the slopes affect the formation of the streaks throughout the martian year. Modelled environmental parameters at the streak-bearing slopes indicate a correlation between seasonal streak activity and surface temperature, as well as wind velocity. Seasonal variations of streak activity could be a result of varying intensities of both dry and wet mechanisms or could be explained by the interaction of multiple mechanisms.

Item URL in elib:https://elib.dlr.de/133500/
Document Type:Article
Title:Seasonal formation rates of martian slope streaks
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Heyer, T.institut für planetologie, westfälische wilhelms‐universität münster, münster, germanyUNSPECIFIED
Kreslavsky, M.Earth and Planetary Sciences, University of California, Santa Cruz, CA, USAUNSPECIFIED
Hiesinger, H.westfälische wilhelms-universität münsterUNSPECIFIED
Reiss, D.Institut für Planetologie, Westfälische Wilhelms‐Universität Münster, Münster, GermanyUNSPECIFIED
Bernhardt, H.Arizona State University, Tempe (USA)UNSPECIFIED
Jaumann, Rralf.jaumann (at) dlr.deUNSPECIFIED
Date:May 2019
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:323
DOI :10.1016/j.icarus.2019.01.010
Page Range:pp. 76-86
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Mars Surface changes Slope streak Geological processes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MARS-EXPRESS / HRSC
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Hauschild, Claudia
Deposited On:15 Jan 2020 06:12
Last Modified:20 Jan 2020 11:13

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