Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL079598 |
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
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
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 | |
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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论