DOI: 10.1002/jgrd.50876
论文题名: Velocities in the plume of the 2010 Eyjafjallajökull eruption
作者: Bjornsson H. ; Magnusson S. ; Arason P. ; Petersen G.N.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11698
结束页码: 11711
语种: 英语
英文关键词: explosive volcanic eruptions
; Eyjafjallajökull
; volcanic plumes
Scopus关键词: Explosives
; Volcanoes
; Cross correlation methods
; Effusive phase
; Explosive activity
; Lateral motion
; Velocity structure
; Volcanic clouds
; Volcanic eruptions
; Volcanic plume
; Velocity
; explosive volcanism
; plume
; velocity structure
; volcanic ash
; volcanic cloud
; volcanic eruption
; Eyjafjallajokull
; Iceland
英文摘要: The eruption of the Icelandic volcano Eyjafjallajökull in the spring of 2010 lasted for 39 days with an explosive phase (14-18 April), an effusive phase (18 April to 4 May) and a phase with renewed explosive activity (5-17 May). Images every 5 s from a camera mounted 34 km from the volcano are available for most of the eruption. Applying the maximum cross-correlation method (MCC) on these images, the velocity structure of the eruption cloud has been mapped in detail for four time intervals covering the three phases of the eruption. The results show that on average there are updrafts in one part of the cloud and lateral motion or downdrafts in another. Even within the updraft part, there are alternating motions of strong updrafts, weak updrafts, and downward motion. These results show a highly variable plume driven by intermittent explosions. The results are discussed in the context of integral plume models and in terms of elementary parcel theory. Key Points Velocities in a volcanic cloud based on analysis of image data from the eruption Velocities in the eruption cloud are inhomogeneous and updrafts intermittent Intermittent updrafts are important for the dynamics and the lofting of ash ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63221
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Icelandic Meteorological Office, Bustadavegur 9, IS-150 Reykjavík, Iceland; Division of Optimization and Systems Theory, Royal Institute of Technology, Stockholm, Sweden
Recommended Citation:
Bjornsson H.,Magnusson S.,Arason P.,et al. Velocities in the plume of the 2010 Eyjafjallajökull eruption[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)