Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.aeolia.2016.09.003 |
Evaporative sodium salt crust development and its wind tunnel derived transport dynamics under variable climatic conditions | |
Nield, Joanna M.1; Neuman, Cheryl McKenna2; O’Brien, Patrick2; Bryant, Robert G.3; Wiggs, Giles F. S.4 | |
通讯作者 | Nield, Joanna M. |
来源期刊 | Aeolian Research
![]() |
ISSN | 1875-9637 |
EISSN | 2212-1684 |
出版年 | 2016 |
卷号 | 23页码:51-62 |
英文摘要 | Playas (or ephemeral lakes) can be significant sources of dust, but they are typically covered by salt crusts of variable mineralogy and these introduce uncertainty into dust emission predictions. Despite the importance of crust mineralogy to emission potential, little is known about (i) the effect of short-term changes in temperature and relative humidity on the erodibility of these crusts, and (ii) the influence of crust degradation and mineralogy on wind speed threshold for dust emission. Our understanding of systems where emission is not driven by impacts from saltators is particularly poor. This paper describes a wind tunnel study in which dust emission in the absence of saltating particles was measured for a suite of climatic conditions and salt crust types commonly found on Sua Pan, Botswana. The crusts were found to be non-emissive under climate conditions characteristic of dawn and early morning, as compared to hot and dry daytime conditions when the wind speed threshold for dust emission appears to be highly variable, depending upon salt crust physicochemistry. Significantly, sodium sulphate rich crusts were found to be more emissive than crusts formed from sodium chloride, while degraded versions of both crusts had a lower emission threshold than fresh, continuous crusts. The results from this study are in agreement with in-situ field measurements and confirm that dust emission from salt crusted surfaces can occur without saltation, although the vertical fluxes are orders of magnitude lower (similar to 10 mu g/m/s) than for aeolian systems where entrainment is driven by particle impact. (C) 2016 The Authors. Published by Elsevier B.V. |
英文关键词 | Sodium sulphate (mirabilite and thenardite) Sodium chloride (halite) Aeolian dust source Playa Surface crust Wind tunnel |
类型 | Article |
语种 | 英语 |
国家 | England ; Canada |
收录类别 | SCI-E |
WOS记录号 | WOS:000389159200005 |
WOS关键词 | DUST EMISSION ; CRYSTALLIZATION DAMAGE ; SEDIMENTARY PARTICLES ; SURFACE-ROUGHNESS ; MOJAVE DESERT ; PLAYA ; USA ; CALIFORNIA ; SULFATE ; LAKE |
WOS类目 | Geography, Physical |
WOS研究方向 | Physical Geography |
来源机构 | University of Oxford |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/191019 |
作者单位 | 1.Univ Southampton, Geog & Environm, Southampton SO17 1BJ, Hants, England; 2.Trent Univ, Dept Geog, Peterborough, ON K9J 7B8, Canada; 3.Univ Sheffield, Dept Geog, Sheffield S10 2TN, S Yorkshire, England; 4.Univ Oxford, Ctr Environm, Sch Geog & Environm, Oxford OX1 3QY, England |
推荐引用方式 GB/T 7714 | Nield, Joanna M.,Neuman, Cheryl McKenna,O’Brien, Patrick,et al. Evaporative sodium salt crust development and its wind tunnel derived transport dynamics under variable climatic conditions[J]. University of Oxford,2016,23:51-62. |
APA | Nield, Joanna M.,Neuman, Cheryl McKenna,O’Brien, Patrick,Bryant, Robert G.,&Wiggs, Giles F. S..(2016).Evaporative sodium salt crust development and its wind tunnel derived transport dynamics under variable climatic conditions.Aeolian Research,23,51-62. |
MLA | Nield, Joanna M.,et al."Evaporative sodium salt crust development and its wind tunnel derived transport dynamics under variable climatic conditions".Aeolian Research 23(2016):51-62. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。