DOI: 10.1002/grl.50942
论文题名: Density-driven transport in the umbrella region of volcanic clouds: Implications for tephra dispersion models
作者: Costa A. ; Folch A. ; Macedonio G.
刊名: Geophysical Research Letters
ISSN: 0094-8548
EISSN: 1944-8279
出版年: 2013
卷: 40, 期: 18 起始页码: 4823
结束页码: 4827
语种: 英语
英文关键词: 1991 Pinatubo eruption
; gravity-driven transport
; tephra transport model
; volcanic cloud
Scopus关键词: Advection-Diffusion
; gravity-driven transport
; Low mass flow rates
; Pinatubo
; Transport mechanism
; Transport modeling
; Volcanic clouds
; Volcanic eruptions
; Flow rate
; Gravitation
; Gravity waves
; Mass transfer
; Clouds
; atmospheric modeling
; atmospheric plume
; atmospheric transport
; Richardson number
; volcanic cloud
; volcanic eruption
; Pinatubo
英文摘要: Large explosive volcanic eruptions can generate ash clouds from rising plumes that spread in the atmosphere around a Neutral Buoyancy Level (NBL). These ash clouds spread as inertial intrusions and are advected by atmospheric winds. For low mass flow rates, tephra transport is mainly dictated by wind advection, because ash cloud spreading due to gravity current effects is negligible (passive transport). For large mass flow rates, gravity-driven transport at the NBL can be the dominant transport mechanism. Conditions under which the passive transport assumption is valid have not yet been critically studied. We analyze the conditions when gravity-driven transport is dominant in terms of the cloud Richardson number. Moreover, we couple an analytical model that describes cloud spreading as a gravity current with an advection-diffusion model. This coupled model is used to simulate the evolution of the volcanic cloud during the climatic phase of the 1991 Pinatubo eruption. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883888713&doi=10.1002%2fgrl.50942&partnerID=40&md5=7739de42b2ef1c2135fc85e8f83306e3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5812
Appears in Collections: 气候减缓与适应
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作者单位: Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Via Donato Creti 12, I-40128 Bologna, Italy
Recommended Citation:
Costa A.,Folch A.,Macedonio G.. Density-driven transport in the umbrella region of volcanic clouds: Implications for tephra dispersion models[J]. Geophysical Research Letters,2013-01-01,40(18).