Effects of soil moisture and dried raindroplet crust on saltation and dust emission
Effects of soil moisture and dried raindroplet crust on saltation and dust emission
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DOI：
10.1029/2008jd009955
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发表时间：
2008-12-30
影响因子：
4.4
通讯作者：
McTainsh, G. H.
中科院分区：
文献类型：
--
作者：
Ishizuka, M.;Mikami, M.;McTainsh, G. H.
在澳大利亚一块之前种植小麦的休耕田中，利用沙尘粒子计数器和光学粒子计数器进行的野外实验，阐明了在潮湿和弱结皮条件下跃移与沙尘排放之间的联系。少量降水事件后，雨滴的撞击形成了一层结皮。即使土壤变干，少量的土壤水分也增强了结皮和团聚的强度。沙尘浓度与摩阻风速成正比，但这种比例关系取决于地表条件，比如母土的最小分散粒径分布以及是否存在结皮。
Field experiments using a sand particle counter and an optical particle counter clarified the links between saltation and dust emission under wet and weakly crusted conditions in a fallow field previously cultivated with wheat in Australia. A crust was formed by the impact of raindroplets after small precipitation events. A little soil moisture enhanced the strengths of crust and aggregation even though the soil was dried. Dust concentration was proportional to friction wind velocity, but the proportionality was dependent on ground surface conditions, such as the minimally dispersed particle size distribution of parent soil and the presence or absence of crust.