气候变化领域集成服务门户(CCPortal): Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash

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DOI	10.1016/j.epsl.2021.116980
	Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash
	Poulidis A.P.; Biass S.; Bagheri G.; Takemi T.; Iguchi M.
发表日期	2021
ISSN	0012821X
卷号	566
英文摘要	The simulation of volcanic ash transport and deposition (VATD) for distances within a few kilometres from the vent (proximal region) is challenging owing to a combination of unresolved volcanogenic effects and the impact of the volcano's orography. Due to the urgency of calculations or sometimes lack of access to computational resources or expertise, atmospheric vertical velocity (w) is often underestimated in VATD modelling. The error associated with this underestimation has, however, never been properly quantified. Here, we use a weak vulcanian eruption that occurred at Sakurajima volcano on 1/10/2017 as a first step to addressing this limitation. We combine deposit characteristics observed by disdrometer measurements with high-resolution atmospheric and VATD modelling to validate and illustrate the differences in modelled trajectories when w is either ignored or accounted for. The Weather Research and Forecasting (WRF) model is used to model the orogenic effects down to a resolution of 50 m. Eulerian and Lagrangian VATD models (FALL3D and LagTrack, a newly-developed Matlab code, respectively) are used to describe the particle trajectories. Results confirm the importance of w in the case of low-altitude eruptions for capturing the complex, near-vent trajectory of ash particles: when neglected fall velocities were seen to differ up to 2–5 m s−1 depending on the particle size. Although the impact of w is most notable within 10 km from the vent, the forced sedimentation of low terminal velocity particles can have a significant secondary effect at larger distances. © 2021 Elsevier B.V.
关键词	dispersal modelling Lagrangian large-eddy simulation Sakurajima volcano trajectory volcanic ash
英文关键词	Deposition; Lagrange multipliers; MATLAB; Particle size; Trajectories; Velocity; Volcanoes; Weather forecasting; Computational resources; Deposition modeling; Dispersal modeling; Lagrangian; Large-eddy simulations; Sakurajima volcano; Transport modelling; Vertical velocity; Volcanic ash; Volcanic ash transports; Large eddy simulation; atmospheric deposition; atmospheric transport; Lagrangian analysis; large eddy simulation; trajectory; volcanic aerosol; volcanic ash; volcanic eruption; Japan; Kagoshima [Kyushu]; Kyushu; Sakurajima
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203256
作者单位	Disaster Prevention Research Institute, Kyoto University, Kagoshima, 891-1419, Japan; Institute of Environmental Physics, University of Bremen, Bremen, 28359, Germany; Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Laboratory of Fluid Physics, Max Planck Institute for Dynamics and Self-organization, Gottingen, 37077, Germany; Disaster Prevention Research Institute, Kyoto University, Uji, 611-0011, Japan
推荐引用方式 GB/T 7714	Poulidis A.P.,Biass S.,Bagheri G.,et al. Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash[J],2021,566.
APA	Poulidis A.P.,Biass S.,Bagheri G.,Takemi T.,&Iguchi M..(2021).Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash.Earth and Planetary Science Letters,566.
MLA	Poulidis A.P.,et al."Atmospheric vertical velocity - a crucial component in understanding proximal deposition of volcanic ash".Earth and Planetary Science Letters 566(2021).