Seasonal variations in airflow over the Namib Dune, Gale Crater, Mars: Implications for dune dynamics.

Carin Cornwall, DWT Jackson, Mary Bourke, Meiring Beyers, Andrew Cooper

Research output: Contribution to journalArticle

Abstract

Dune length scale airflow modelling provides new insights on aeolian bedform response and complex near surface 3D wind patterns not previously resolved by mesoscale models. At a 1‐m surface resolution, Curiosity wind data is used to investigate the aeolian environment of the Namib dune on Mars, providing improved seasonal constraints on grainfall, grainflow activity and ripple migration. Based on satellite images, airflow patterns, and surface shear stress, enhanced aeolian activity and slipface advancement occurs during early springtime. Autumn and winter winds are also favorable to aeolian activity but minimal movement was detected in satellite images overlapping with wind data. During the summer, the migration of large stoss ripples on the Namib dune may augment sediment deposition on the slipface. These results provide a better understanding of the overall migration pattern of the Namib dune which can be extrapolated to other dunes in the Bagnold Dune Field.
LanguageEnglish
Pages9498-9507
JournalGeophysical Research Letters
Volume45
Issue number18
Early online date11 Sep 2018
DOIs
Publication statusPublished - 27 Sep 2018

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airflow
crater
dune
Mars
seasonal variation
eolian process
ripple
dune field
bedform
surface wind
shear stress
autumn
winter
summer
sediment
modeling
satellite image

Keywords

  • aeolian dune CFD modelling Mars

Cite this

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title = "Seasonal variations in airflow over the Namib Dune, Gale Crater, Mars: Implications for dune dynamics.",
abstract = "Dune length scale airflow modelling provides new insights on aeolian bedform response and complex near surface 3D wind patterns not previously resolved by mesoscale models. At a 1‐m surface resolution, Curiosity wind data is used to investigate the aeolian environment of the Namib dune on Mars, providing improved seasonal constraints on grainfall, grainflow activity and ripple migration. Based on satellite images, airflow patterns, and surface shear stress, enhanced aeolian activity and slipface advancement occurs during early springtime. Autumn and winter winds are also favorable to aeolian activity but minimal movement was detected in satellite images overlapping with wind data. During the summer, the migration of large stoss ripples on the Namib dune may augment sediment deposition on the slipface. These results provide a better understanding of the overall migration pattern of the Namib dune which can be extrapolated to other dunes in the Bagnold Dune Field.",
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Seasonal variations in airflow over the Namib Dune, Gale Crater, Mars: Implications for dune dynamics. / Cornwall, Carin; Jackson, DWT; Bourke, Mary; Beyers, Meiring; Cooper, Andrew.

In: Geophysical Research Letters, Vol. 45, No. 18, 27.09.2018, p. 9498-9507.

Research output: Contribution to journalArticle

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