Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2014JF003177 |
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
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ISSN | 2169-9003 |
EISSN | 2169-9011 |
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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