气候变化领域集成服务门户(CCPortal): Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release

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DOI	10.1029/2019JB018902
	Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release
	Mannen K.; Hasenaka T.; Higuchi A.; Kiyosugi K.; Miyabuchi Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	We developed a simulation code named WT, which calculates tephra fallout from eruption plumes bent by wind. This proposed model assumes a series of radial particle sources arraying along the theoretically predicted trajectory of the plume center. To validate WT, we reconstructed the tephra dispersal during the 2011 sub-Plinian eruption of Shinmoedake in Japan. This eruption was ideal for the validation because it was observed through various approaches; however, high-resolution data of the fluctuating plume height made it difficult to determine a representative eruption time and plume height for running the simulations. Also, the amount of particle segregation along the plume could not be determined a priori. We thus implemented inversion calculations to study the optimum particle segregation pattern for possible ranges of time and the plume height, and the misfit between the observed and calculated mass loadings on the ground was evaluated. After this process and the following analysis, the optimum eruption time was determined for one of three major explosions (18:00 Japan Standard Time on 26 January). The optimum plume height was estimated to be 4 km above sea level, slightly lower than the estimation derived by the weather satellite (5 km). When wind shear exists, the WT model has a significant advantage in reconstructing tephra dispersal over the classical code named Tephra2, the prototype of WT. The WT inversion implies a simple segregation model from a well-mixed plume, and further studies on particle segregation patterns will help to improve the accuracy of forward WT simulations. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Kirishima; Shinmoedake; sub-Plinian; tephra fall simulation; Tephra2; WT
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187795
作者单位	Hot Springs Research Institute of Kanagawa Prefecture, Odawara, Japan; Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University, Kumamoto, Japan; Center for Environmental Remote Sensing, Chiba University, Chiba, Japan; Kobe Ocean-Bottom Exploration Center, Kobe University, Kobe, Japan
推荐引用方式 GB/T 7714	Mannen K.,Hasenaka T.,Higuchi A.,et al. Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release[J],2020,125(6).
APA	Mannen K.,Hasenaka T.,Higuchi A.,Kiyosugi K.,&Miyabuchi Y..(2020).Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Mannen K.,et al."Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release".Journal of Geophysical Research: Solid Earth 125.6(2020).