Madden-Julian oscillation reproduced by an aqua-planet global cloud resolving model and its sensitivity to environmental conditions
| Project/Area Number |
19K03966
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17020:Atmospheric and hydrospheric sciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | マッデン・ジュリアン振動 / 水惑星実験 / 全球雲解像モデル / マッデン=ジュリアン振動 / 水惑星 / 環境場 / 解像度依存性 / 背景場 |
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| Outline of Research at the Start |
東西約5千キロの雲システムが赤道域を東進するマッデン・ジュリアン振動（MJO）は熱
帯における主要な大気変動であり、地球全体への遠隔的な影響により世界各地で多雨や干ばつなどの極端現象をもたらす。本研究では、現実のMJOをよく再現する超高解像度の全球数値モデルを水惑星という単純化した環境のもとで使用することでMJOの本質的な性質と構造を明らかにし、また環境場の状況やモデル設定によりどのように変質するかを調査する。これにより、MJOのメカニズム・多様性・モデル設定による影響について統一的に理解するための知見を得て、予測精度の向上に貢献することを目的とする。
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| Outline of Final Research Achievements |
The Madden-Julian Oscillation (MJO), is a major fluctuation observed in the tropical atmosphere, which travels eastward on a time scale of several weeks to two months, strongly influencing the global weather and climate. The dependency of MJO to the environmental conditions is investigated in this study by an idealized "aqua-planet" version of the global cloud-resolving model NICAM, which is known for its good performance in reproducing the MJO eastward propagation. The simplification allows to extract the essential aspects of this phenomenon. Results are also compared to experiments conducted under more realistic settings, for interpretation. It was revealed that the east-west contrast in sea surface temperature is crucial for the eastward propagation of the MJO. Furthermore, it was found that the effect is enhanced by latent heat supply from the ocean associated with synoptic-scale atmospheric eddies occurring within the active convective envelope.
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| Academic Significance and Societal Importance of the Research Achievements |
MJOの東進に対して、どのような環境場と擾乱が影響しているかについての理解が進んだことにより、より正確な予報のためには数値予報モデルが、海面水温の東西差がよく表現できることと、海面からの潜熱供給を強化する渦擾乱を適切に表現できる解像度を有することが必要であることが明らかになった。MJOは数週間から2ヶ月程度の比較的長い時間スケールの現象である一方で、中緯度の多雨・小雨や熱波・寒波をもたらしたり台風発生の引き金となったりすることから、本研究による知見を参考にして今後数値予報モデルの改良が進むことにより、こうした現象の季節予測の精度向上に繋がることが期待できる。
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Report
(5 results)
Research Products
(30 results)
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[Journal Article] The Nonhydrostatic ICosahedral Atmospheric Model for CMIP6 HighResMIP simulations (NICAM16-S): experimental design, model description, and impacts of model updates.2021
Author(s)
Kodama, C., Ohno, T., Seiki, T., Yashiro, H., Noda, A. T., Nakano, M., Yamada, Y., Roh, W., Satoh, M., Nitta, T., Goto, D., Miura, H., Nasuno, T., Miyakawa, T., Chen, Y.-W., and Sugi, M.
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Journal Title
Geosci. Model Dev.
Volume: 14
Issue: 2
Pages: 795-820
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] The non-hydrostatic global atmospheric model for CMIP6 HighResMIP simulations (NICAM16-S): Experimental design, model description, and sensitivity experiments.2020
Author(s)
Kodama, C., Ohno, T., Seiki, T., Yashiro, H., Noda, A. T., Nakano, M., Yamada, Y., Roh, W., Satoh, M., Nitta, T., Goto, D., Miura, H., Nasuno, T., Miyakawa, T., Chen, Y.-W., and Sugi, M.
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Journal Title
Geosci. Model Dev. Discuss.
Volume: -
Pages: 795-820
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] Large ensemble simulation for investigating predictability of precursor vortices of Typhoon Faxai in 2019 with a 14-km mesh global nonhydrostatic atmospheric model2022
Author(s)
Yamada, Y., Miyakawa, T., Nakano, M., Kodama, C., Wada, A., Nasuno, T., ChenY.-C., Yamazaki, A., Yashiro, H., Satoh, M.
Organizer
ACM2022
Related Report
Int'l Joint Research / Invited
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[Presentation] Global sub-5km mesh Model Intercomparison (DYAMOND2) and Highlighted Experiments on Supercomputer Fugaku2022
Author(s)
Tomoki Miyakawa, Daniel Klocke, Yohei Yamada, Florian Ziemen, Tamaki Suematsu, Daisuke Takasuka, Masuo Nakano, Ryusuke Masunaga, Chihiro Kodama, Hisashi Yashiro, Takao Kawasaki, Takemasa Miyoshi, Takanori Kodama and Julia Duras
Organizer
AGU 2022
Related Report
Int'l Joint Research
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[Presentation] Introduction to the Ocean-Coupled Components of DYAMOND2, the Inter-Comparison Project for Global “Storm-Resolving” Numerical Models2021
Author(s)
Miyakawa, T., T. Suematsu, R. Masunaga, T. Kawasaki, R. Shibuya, C. Kodama, M. Nakano, H. Yashiro, M. Satoh
Organizer
Platform for Advanced Scientific Computing (PASC) 2021
Related Report
Int'l Joint Research / Invited
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[Presentation] Towards S2S-scale Large-ensemble Prediction Using Global Cloud/cloud-system Resolving Model NICAM on Fugaku2021
Author(s)
Miyakawa, T., Yamada, Y., Suematsu, T., Masunaga, R., Takasuka, D., Nakano, M., Kodama, C., Yashiro, H., Satoh, M., Miyoshi, T., Kodama, T., and Kawasaki, T.
Organizer
Asia Oceania Geosciences Society Annual Meeting 2021
Related Report
Int'l Joint Research
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[Presentation] Overview of global scale large ensemble simulations using NICAM on Fugaku2021
Author(s)
Miyakawa, T., Yamada, Y., Suematsu, T., Masunaga, R., Takasuka, D., Nakano, M., Kodama, C., Yashiro, H., Satoh, M., Miyoshi, T., Kodama, T., and Kawasaki, T.
Organizer
Japan Geoscience Union Meeting 2021
Related Report
Int'l Joint Research
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[Presentation] Dependence of the reproducibility of the MJO convection on differences in the surface flux conditions in NICAM2020
Author(s)
Suematsu, T., Kodama, C., Yashiro, H., Yanase, T., Miura, H., Miyakawa, T., Satoh, M.
Organizer
JpGU 2020
Related Report
Int'l Joint Research
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