Arid
DOI10.1002/2014JF003177
Comparing drag partition schemes over a herbaceous Sahelian rangeland
Pierre, C.1; Bergametti, G.2,3; Marticorena, B.2,3; Kergoat, L.1; Mougin, E.1; Hiernaux, P.1
通讯作者Pierre, C.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN2169-9003
EISSN2169-9011
出版年2014
卷号119期号:10页码:2291-2313
英文摘要

Modeling of dust emissions from the surface remains complex, especially in semiarid regions where vegetation must be accounted for because of its potentially important protective effect. Protection is directly linked to the fraction of the soil surface covered by vegetation, but it is also driven by the interaction of vegetation elements with the wind field. The sensitivity of simulated dust emissions to various drag partition schemesmainly those proposed by Raupach (1992), Marticorena and Bergametti (1995), and Okin (2008)is evaluated for a typical Sahelian rangeland, covered by a seasonal grass layer, over a complete vegetation cycle. The application of these schemes requires a fine characterization of the vegetation cover; field measurements from an ecological survey are used to derive the geometric dimensions of the grass patches. Models are run with meteorological forcing from automatic weather stations. As a result, the impacts of soil moisture and grass cover are estimated over April to September. Soil moisture inhibits dust emissions by 27% in mass. The different drag partition schemes exhibit distinctive limitations, mostly due to the properties of the Sahelian grass cover, which is composed of large and low patches of short grass, with a strong seasonal dynamics. However, the drag partition schemes result in remarkably coherent estimations of dust emissions. When soil moisture is taken into account, vegetation reduces the total vertical mass fluxes by 6 to 26% of the emissions of a bare soil, depending on the drag partition scheme.


英文关键词dust emission modeling Sahelian semiarid area herbaceous and woody vegetation drag partition wind erosion
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000345366600011
WOS关键词SOIL DUST EMISSION ; WIND EROSION ; VEGETATION COVER ; SAHARAN DUST ; AERODYNAMIC ROUGHNESS ; DOMINATED LANDSCAPES ; RELATIVE IMPORTANCE ; CHIHUAHUAN DESERT ; FRICTION VELOCITY ; AEOLIAN EROSION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183380
作者单位1.Geosci Environm Toulouse UPS CNRS IRD CNES, Toulouse, France;
2.Univ Paris Est Creteil, Lab Interuniv Syst Atmospher, Creteil, France;
3.Univ Paris Diderot, Inst Pierre Simon Laplace, Creteil, France
推荐引用方式
GB/T 7714
Pierre, C.,Bergametti, G.,Marticorena, B.,et al. Comparing drag partition schemes over a herbaceous Sahelian rangeland[J],2014,119(10):2291-2313.
APA Pierre, C.,Bergametti, G.,Marticorena, B.,Kergoat, L.,Mougin, E.,&Hiernaux, P..(2014).Comparing drag partition schemes over a herbaceous Sahelian rangeland.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,119(10),2291-2313.
MLA Pierre, C.,et al."Comparing drag partition schemes over a herbaceous Sahelian rangeland".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 119.10(2014):2291-2313.
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