GSTDTAP  > 气候变化
DOI10.1029/2018GL079598
Seasonal Variations in Airflow Over the Namib Dune, Gale Crater, Mars: Implications for Dune Dynamics
Cornwall, Carin1; Jackson, Derek W. T.1; Bourke, Mary C.2; Beyers, Meiring3; Cooper, J. Andrew G.1
2018-09-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:18页码:9498-9507
文章类型Article
语种英语
国家North Ireland; Canada
英文摘要

Dune length scale airflow modeling provides new insights on eolian bedform response and complex near-surface 3-D wind patterns not previously resolved by mesoscale models. At a 1-m surface resolution, Curiosity wind data are used to investigate the eolian 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 eolian activity, and slipface advancement occurs during early springtime. Autumn and winter winds are also favorable to eolian 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.


Plain Language Summary At 1-m resolution, small-scale airflow modeling can provide new insights into sediment transport and dune migration on Mars. Coupled with wind data collected by the Curiosity rover, this study provides improved, realistic constraints on Martian sediment movement and illustrates how ripples seasonally form and migrate according to changing wind speeds and directions. The spring season with northerly winds is the most influential for dune migration based on modeling results and satellite monitoring, but the quieter summer and autumn seasons with southeasterly winds continue to facilitate ripple migration, which may help maintain slower rates of dune migration despite the opposing wind direction. Based on modeling results, the winter season with high-magnitude northerly winds should produce migration rates similar to spring, but according to satellite monitoring, dune migration stops. Small amounts of frost in between sand grains on the dune surface may be responsible for this halt in dune migration. These results can be applied to other dunes in the Bagnold Dune Field, which likely experience the same seasonal patterns in sediment transport.


英文关键词eolian sediment CFD wind dunes Mars
领域气候变化
收录类别SCI-E
WOS记录号WOS:000447761300019
WOS关键词MONITORING STATION OBSERVATIONS ; LEE-SIDE ; MESOSCALE MODEL ; WINDS ; METEOROLOGY ; SIMULATIONS ; CIRCULATION ; DEPOSITION ; GRAINFALL
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27726
专题气候变化
作者单位1.Ulster Univ, Geog & Environm Sci, Coleraine, Londonderry, North Ireland;
2.Trinity Coll Dublin, Geog, Dublin, Ireland;
3.Klimaat Consulting, Guelph, ON, Canada
推荐引用方式
GB/T 7714
Cornwall, Carin,Jackson, Derek W. T.,Bourke, Mary C.,et al. Seasonal Variations in Airflow Over the Namib Dune, Gale Crater, Mars: Implications for Dune Dynamics[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(18):9498-9507.
APA Cornwall, Carin,Jackson, Derek W. T.,Bourke, Mary C.,Beyers, Meiring,&Cooper, J. Andrew G..(2018).Seasonal Variations in Airflow Over the Namib Dune, Gale Crater, Mars: Implications for Dune Dynamics.GEOPHYSICAL RESEARCH LETTERS,45(18),9498-9507.
MLA Cornwall, Carin,et al."Seasonal Variations in Airflow Over the Namib Dune, Gale Crater, Mars: Implications for Dune Dynamics".GEOPHYSICAL RESEARCH LETTERS 45.18(2018):9498-9507.
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