Arid
DOI10.1016/j.aeolia.2015.11.006
Threshold wind velocity dynamics as a driver of aeolian sediment mass flux
Webb, Nicholas P.1; Galloza, Magda S.1; Zobeck, Ted M.2; Herrick, Jeffrey E.1
通讯作者Webb, Nicholas P.
来源期刊AEOLIAN RESEARCH
ISSN1875-9637
EISSN2212-1684
出版年2016
卷号20页码:45-58
英文摘要

Horizontal (saltation) mass flux is a key driver of aeolian dust emission. Estimates of the horizontal mass flux underpin assessments of the global dust budget and influence our understanding of the dust cycle and its interactions. Current equations for predicting horizontal mass flux are based on limited field data and are constrained to representing transport-limited equilibrium saltation, driven by the wind momentum flux in excess of an entrainment threshold. This can result in large overestimation of the sediment mass flux. Here we compare measurements of the soil entrainment threshold, horizontal mass flux, and their temporal variability for five undisturbed dryland soils to explore the role of threshold in controlling the magnitude of mass flux. Average and median entrainment threshold showed relatively small variability among sites and relatively small variability between seasons, despite significant differences in soil surface conditions. Physical and biological soil crusts had little effect on the threshold value, and threshold appeared to play a minor role in determining the magnitude of sediment transport. Our results suggest that horizontal mass flux was controlled more by the supply limitation and abrasion efficiency of saltators present as loose erodible material or originating from neighboring soil sources. The omission of sediment supply and explicit representation of saltation bombardment from horizontal flux equations is inconsistent with the process representation in dust emission schemes and contributes to uncertainty in model predictions. This uncertainty can be reduced by developing greater process fidelity in models to predict horizontal mass flux under both supply- and transport-limited conditions. Published by Elsevier B.V.


英文关键词Wind erosion Dust Erodibility Transport Sediment flux Supply limitation
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000372381500005
WOS关键词SALTATING PARTICLES ; FRICTION VELOCITY ; SAND TRANSPORT ; CHIHUAHUAN DESERT ; SHEAR VELOCITY ; SOIL SURFACES ; NEW-MEXICO ; EROSION ; MODEL ; TUNNEL
WOS类目Geography, Physical
WOS研究方向Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/191003
作者单位1.NMSU, USDA ARS Jornada Expt Range, MSC JER 3, Box 30003, Las Cruces, NM 88003 USA;
2.USDA ARS Wind Eros & Water Conservat Res Unit, 3810 4th St, Lubbock, TX 79415 USA
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Webb, Nicholas P.,Galloza, Magda S.,Zobeck, Ted M.,et al. Threshold wind velocity dynamics as a driver of aeolian sediment mass flux[J],2016,20:45-58.
APA Webb, Nicholas P.,Galloza, Magda S.,Zobeck, Ted M.,&Herrick, Jeffrey E..(2016).Threshold wind velocity dynamics as a driver of aeolian sediment mass flux.AEOLIAN RESEARCH,20,45-58.
MLA Webb, Nicholas P.,et al."Threshold wind velocity dynamics as a driver of aeolian sediment mass flux".AEOLIAN RESEARCH 20(2016):45-58.
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