Arid
DOI10.1007/s11430-015-5246-8
Sand dunes as potential sources of dust in northern China
Sweeney, Mark R.1; Lu HuaYu2; Cui MengChun2; Mason, Joseph A.3; Feng Han2; Xu ZhiWei2
通讯作者Sweeney, Mark R.
来源期刊SCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
EISSN1869-1897
出版年2016
卷号59期号:4页码:760-769
英文摘要

While saltation bombardment of sand grains on a fine substrate can produce considerable dust, the well-sorted nature of sand dunes tends to preclude them from consideration as major dust sources. Recent research, however, has revealed that sand dunes can, in some cases, be large sources of dust. We used the PI-SWERL (Portable In-Situ Wind Erosion Laboratory) to measure in the field the potential of sand dunes and other desert landforms to emit particulate matter < 10 mu m (PM-10) dust in the Tengger, Ulan Buh, and Mu Us deserts of northern China. Combined with high resolution particle size measurements of the dune sand, an assessment of sand dunes as a dust source can be made. Large active transverse dunes tend to contain little to no stored PM-10, yet they produce a low dust flux. Coppice dunes stabilized by vegetation contain appreciable PM-10 and have very high dust emission potential. There is a positive correlation between the amount of PM-10 stored in a dune and its potential dust flux. Saltation liberates loose fines stored in dunes, making them very efficient dust emitters compared to landforms such as dry lake beds and washes where dust particles are unavailable for aeolian transport due to protective crusts or sediment cohesion. In cases where large dunes do not store PM-10 yet emit dust when active, two hypotheses can be considered: (1) iron-oxide grain coatings are removed during saltation, creating dust, and (2) sand grains collide during saltation, abrading grains to create dust. Observations reveal that iron oxide coatings are present on some dune sands. PI-SWERL data suggests that low dust fluxes from dunes containing no stored dust may represent an estimate for the amount of PM-10 dust produced by removal of iron oxide coatings. These results are similar to results from dunes in the United States. In addition, PI-SWERL results suggest that dust-bearing coppice dunes, which cover vast areas of China’s sandy deserts, may become major sources of dust in the future if overgrazing, depletion of groundwater, or drought destabilizes the vegetation that now partially covers these dunes.


英文关键词Coppice dunes Transverse dunes Dust PI-SWERL Desert
类型Article
语种英语
国家USA ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000372544800008
WOS关键词MINERAL DUST ; WIND-EROSION ; AEOLIAN ABRASION ; SILT PRODUCTION ; BADAIN JARAN ; LOESS ; DESERT ; EMISSION ; MONGOLIA ; PLATEAU
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构南京大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196170
作者单位1.Univ S Dakota, Dept Earth Sci, Vermillion, SD 57069 USA;
2.Nanjing Univ, Sch Geog & Oceanog Sci, Lab Earth Surface Proc & Environm, Nanjing 210008, Jiangsu, Peoples R China;
3.Univ Wisconsin, Dept Geog, Madison, WI 53706 USA
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GB/T 7714
Sweeney, Mark R.,Lu HuaYu,Cui MengChun,et al. Sand dunes as potential sources of dust in northern China[J]. 南京大学,2016,59(4):760-769.
APA Sweeney, Mark R.,Lu HuaYu,Cui MengChun,Mason, Joseph A.,Feng Han,&Xu ZhiWei.(2016).Sand dunes as potential sources of dust in northern China.SCIENCE CHINA-EARTH SCIENCES,59(4),760-769.
MLA Sweeney, Mark R.,et al."Sand dunes as potential sources of dust in northern China".SCIENCE CHINA-EARTH SCIENCES 59.4(2016):760-769.
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