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DOI | 10.1002/2017JD026595 |
Orographic effects on the transport and deposition of volcanic ash: A case study of Mount Sakurajima, Japan | |
Poulidis, Alexandros P.1; Takemi, Tetsuya1; Iguchi, Masato2; Renfrew, Ian A.3 | |
2017-09-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; England |
英文摘要 | Volcanic ash is a major atmospheric hazard that has a significant impact on local populations and international aviation. The topography surrounding a volcano affects the transport and deposition of volcanic ash, but these effects have not been studied in depth. Here we investigate orographic impacts on ash transport and deposition in the context of the Sakurajima volcano in Japan, using the chemistry-resolving version of the Weather Research and Forecasting model. Sakurajima is an ideal location for such a study because of the surrounding mountainous topography, frequent eruptions, and comprehensive observing network. At Sakurajima, numerical experiments reveal that across the 2-8 phi grain size range, the deposition of "medium-sized" ash (3-5 phi) is most readily affected by orographic flows. The direct effects of resolving fine-scale orographic phenomena are counteracting: mountain-induced atmospheric gravity waves can keep ash afloat, while enhanced downslope winds in the lee of mountains (up to 50% stronger) can force the ash downward. Gravity waves and downslope winds were seen to have an effect along the dispersal path, in the vicinity of both the volcano and other mountains. Depending on the atmospheric conditions, resolving these orographic effects means that ash can be transported higher than the initial injection height (especially for ash finer than 2 phi), shortly after the eruption (within 20 min) and close to the vent (within the first 10 km), effectively modifying the input plume height used in an ash dispersal model-an effect that should be taken into account when initializing simulations. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416387300024 |
WOS关键词 | FROUDE-NUMBER FLOW ; SURFACE WIND ; MODEL ; TEPHRA ; SIMULATIONS ; CONVECTION ; THICKNESS ; VOLUME |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32411 |
专题 | 气候变化 |
作者单位 | 1.Kyoto Univ, Disaster Prevent Res Inst, Uji, Kyoto, Japan; 2.Kyoto Univ, Disaster Prevent Res Inst, Sakurajima, Japan; 3.Univ East Anglia, Sch Environm Sci, Ctr Ocean & Atmospher Sci, Norwich, Norfolk, England |
推荐引用方式 GB/T 7714 | Poulidis, Alexandros P.,Takemi, Tetsuya,Iguchi, Masato,et al. Orographic effects on the transport and deposition of volcanic ash: A case study of Mount Sakurajima, Japan[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(17). |
APA | Poulidis, Alexandros P.,Takemi, Tetsuya,Iguchi, Masato,&Renfrew, Ian A..(2017).Orographic effects on the transport and deposition of volcanic ash: A case study of Mount Sakurajima, Japan.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(17). |
MLA | Poulidis, Alexandros P.,et al."Orographic effects on the transport and deposition of volcanic ash: A case study of Mount Sakurajima, Japan".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.17(2017). |
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