2022 Fiscal Year Final Research Report
Influence of mountain topography on aerosol transportation
| Project/Area Number |
19H04242
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Kindai University |
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Principal Investigator |
Sano Itaru 近畿大学, 情報学部, 教授 (10247950)
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| Co-Investigator(Kenkyū-buntansha) |
向井 苑生 京都情報大学院大学, その他の研究科, 教授 (00097411)
中田 真木子 近畿大学, 総合社会学部, 准教授 (80525791)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | aerosol / AERONET / DRAGON / J-ALPS / mountain / SCALE / SCALE-Chem |
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| Outline of Final Research Achievements |
The goal of this work is to understand the influence of mountain ranges on aerosol transportation based on measurements as well as regional model simulations. Optical properties of aerosols were taken with twelve AERONET instruments deployed at four mountains and eight ground sites in Nagano region in spring of 2020 and in 2021 as DRAGON/J-ALPS project.
The aerosol concentration (AOT) in Nagano is smaller than in other areas of Japan. It is found that Asian dust crosses mountain ranges, however, dust at lower elevation is deposited due to existence of mountains. The results of regional model simulations show that westerly winds in the mountain ranges provide a mountain shielding effect. On the other hand, the existed aerosols in the basin can not cross mountain under weak wind conditions, which leads to higher aerosol concentrations. The measurements and simulations have shown that mountain ranges have a significant impact on aerosol transportation.
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| Free Research Field |
大気リモートセンシング
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| Academic Significance and Societal Importance of the Research Achievements |
2020～21年においてNASAと共同で12台のAERONET放射計を中部山岳地帯地域に配置(DRAGON/J-ALPS)しエアロゾルの光学的特性を得た．同時稼働の石川能登など他地域と比べても松本盆地などは国外からの汚染物質流入が少なく，それは黄砂現象時においても見られた．最新の領域モデル（SCALE-Chem）を用いたエアロゾル輸送実験を実施し，山岳遮蔽によるエアロゾル濃度減少，トラップ（盆地効果）による濃度増大を定量的に得ることができた．AERONET計測データはNASAのWeb（https://aeronet.gsfc.nasa.gov）より公開済で，様々な研究者がアクセス可能である．
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