| DOI: | 10.1002/2014GL062454
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| 论文题名: | Volcanic ash layer depth: Processes and mechanisms |
| 作者: | Dacre H.F.; Grant A.L.M.; Harvey N.J.; Thomson D.J.; Webster H.N.; Marenco F.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9066
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| EISSN: | 1944-8797
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| 出版年: | 2015
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| 卷: | 42, 期:2 | | 起始页码: | 637
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| 结束页码: | 645
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| 语种: | 英语
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| 英文关键词: | ash sedimentation
; ash size distribution
; turbulent mixing
; vertical wind shear
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| Scopus关键词: | Atmospheric movements
; Mixing
; Shock tubes
; Statistics
; Turbulent flow
; Ash particles
; Atmospheric dispersion modelling
; Dominant process
; Standard deviation
; Turbulent mixing
; Vertical emission
; Vertical wind shear
; Volcanic ash clouds
; Volcanoes
; ash flow
; climate modeling
; lidar
; simulation
; turbulent flow
; volcanic ash
; volcanic eruption
; wind shear
; Eyjafjallajokull
; Iceland
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| 英文摘要: | The long duration of the 2010 Eyjafjallajökull eruption provided a unique opportunity to measure a widely dispersed volcanic ash cloud. Layers of volcanic ash were observed by the European Aerosol Research Lidar Network with a mean depth of 1.2 km and standard deviation of 0.9 km. In this paper we evaluate the ability of the Met Office's Numerical Atmospheric-dispersion Modelling Environment (NAME) to simulate the observed ash layers and examine the processes controlling their depth. NAME simulates distal ash layer depths exceptionally well with a mean depth of 1.2 km and standard deviation of 0.7 km. The dominant process determining the depth of ash layers over Europe is the balance between the vertical wind shear (which acts to reduce the depth of the ash layers) and vertical turbulent mixing (which acts to deepen the layers). Interestingly, differential sedimentation of ash particles and the volcano vertical emission profile play relatively minor roles. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923549852&doi=10.1002%2f2014GL062454&partnerID=40&md5=2a7c3b69a96a4ebe479911122eda98f9
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8682
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Meteorology, University of Reading, Reading, United Kingdom
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| Recommended Citation: | |
Dacre H.F.,Grant A.L.M.,Harvey N.J.,et al. Volcanic ash layer depth: Processes and mechanisms[J]. Geophysical Research Letters,2015-01-01,42(2).
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