| 研究課題/領域番号 |
22KF0010
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| 補助金の研究課題番号 |
22F32012 (2022)
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 基金 (2023)
補助金 (2022) |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分17020:大気水圏科学関連
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| 研究機関 | 北海道大学 |
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研究代表者 |
藤原 正智 北海道大学, 地球環境科学研究院, 教授 (00360941)
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| 研究分担者 |
DOGAR MUHAMMAD 北海道大学, 地球環境科学研究院, 外国人特別研究員
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| 研究期間 (年度) |
2023-03-08 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
2,300千円 (直接経費: 2,300千円)
2023年度: 1,100千円 (直接経費: 1,100千円)
2022年度: 1,200千円 (直接経費: 1,200千円)
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| キーワード | climate / volcanic eruption / climate modeling / numerical experiments / El Nino / La Nina / ENSO / NAO / Southern Oscillation |
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| 研究開始時の研究の概要 |
The aim of this research project is to improve our understanding of the climate response to volcanic eruptions by conducting several numerical experiments using a global climate model. This project will focus on (a) the role of strong tropical and high latitude eruptions in modifying atmospheric circulation, (b) the role of the background initial conditions of the equatorial Pacific surface temperature and the stratospheric circulation at the time of the eruption, and (c) understanding the volcanically induced low-to-high latitude teleconnections.
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| 研究実績の概要 |
Dr. Dogar has analyzed data from his ensemble numerical experiments using the Geophysical Fluid Dynamics Laboratory (GFDL)'s coupled atmosphere-ocean climate model (GFDL-CM2.1) run on the Hokkaido University's high-performance supercomputing facility in the previous year. Dr. Dogar has written up a journal paper manuscript titled "ENSO and NAO Linkage to Strong Volcanism and Associated Post-Volcanic High-Latitude Winter Warming", which has been published in Geophysical Research Letter in January 2024. The main message of the paper is, "Our simulations strongly suggest that the post-eruption Eurasian winter warming is caused by a post-eruption positive NAO phase and not by coexisting ENSO-preconditioned variability." Furthermore, using the same simulation data set, Dr. Dogar has written up another manuscript titled "Volcanic Whispers: Decoding Post-eruption Winter Cooling Mysteries in the Middle East and North Africa - Unraveling ENSO and NAO Dynamics" and submitted it to another journal.
Dr. Dogar attended the American Geophysical Union (AGU) Fall Meeting 2023 in December 2023 and the US CLIVAR's Workshop on Confronting Earth System Model Trends with Observations: The Good, the Bad, and the Ugly and presented these works there.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In the past two years i.e. during the term of this budget, numerical experiments have been successfully conducted as planned, two papers have been published, and one paper has been submitted and under review.
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| 今後の研究の推進方策 |
We think that the proposed research for this budget has been largely completed with very satisfactory results. The remaining issue is to work on the submitted manuscript until its publication.
Based on the results obtained with this budget, Dr. Dogar will consider new research plans to further improve our understanding of the climate response to volcanic eruptions.
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