Madden-Julian oscillation reproduced by an aqua-planet global cloud resolving model and its sensitivity to environmental conditions

• Project/Area Number: 19K03966
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 17020:Atmospheric and hydrospheric sciences-related
• Research Institution: The University of Tokyo
• Principal Investigator: Miyakawa Tomoki 東京大学, 大気海洋研究所, 准教授 (80584979)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥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)
• 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

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。

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.

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。

Research Products

• [Int'l Joint Research] Max Plank Institute for Meteorology(ドイツ)
• [Int'l Joint Research] Max Planck Institute for Meteorology/Deutscher Wetterdienst(ドイツ)
• [Int'l Joint Research] University of Washington(米国)
• [Int'l Joint Research] ECMWF(英国)
• [Journal Article] Flux Adjustment on Seasonal-Scale Sea Surface Temperature Drift in NICOCO (2023)
  • Author(s): MASUNAGA Ryusuke、MIYAKAWA Tomoki、KAWASAKI Takao、YASHIRO Hisashi
  • Journal Title: Journal of the Meteorological Society of Japan. Ser. II Volume: 101 Issue: 3 Pages: 175-189
  • DOI: 10.2151/jmsj.2023-010
  • ISSN: 0026-1165, 2186-9057
  • Peer Reviewed / Open Access
• [Journal Article] Climate of High-obliquity Exoterrestrial Planets with a Three-dimensional Cloud System Resolving Climate Model (2022)
  • Author(s): Kodama Takanori、Takasuka Daisuke、Sherriff-Tadano Sam、Kuroda Takeshi、Miyakawa Tomoki、Abe-Ouchi Ayako、Satoh Masaki
  • Journal Title: The Astrophysical Journal Volume: 940 Issue: 1 Pages: 87-87
  • DOI: 10.3847/1538-4357/ac98ae
  • Peer Reviewed / Open Access / Int'l Joint Research
• [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.
  • Journal Title: Geosci. Model Dev. Volume: 14 Issue: 2 Pages: 795-820
  • DOI: 10.5194/gmd-14-795-2021
  • Peer Reviewed / Open Access
• [Journal Article] The Role of Typhoon Kilo (T1517) in the Kanto-Tohoku Heavy Rainfall Event in Japan in September 2015 (2020)
  • Author(s): Nakamura, Y., T. Miyakawa, M. Satoh
  • Journal Title: Journal of the Meteorological Society of Japan. Ser. II Volume: 98 Issue: 5 Pages: 915-926
  • DOI: 10.2151/jmsj.2020-046
  • NAID: 130007919234
  • ISSN: 0026-1165, 2186-9057
  • Peer Reviewed / Open Access
• [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.
  • Journal Title: Geosci. Model Dev. Discuss. Volume: - Pages: 795-820
  • DOI: 10.5194/gmd-2019-369
  • Peer Reviewed / Open Access
• [Presentation] Global coupled simulations with cloud-resolving atmosphere and eddy-resolving ocean coupled models (2023)
  • Author(s): Ryusuke Masunaga and Tomoki Miyakawa
  • Organizer: 2nd EarthCARE Modeling Workshop
  • Int'l Joint Research
• [Presentation] Global sub-5 km mesh model intercomparison (DYAMOND2) (2023)
  • Author(s): Tomoki Miyakawa, Daniel Klocke, Florian Zieman, Julia Duras
  • Organizer: 2nd EarthCARE Modeling Workshop
  • Int'l Joint Research
• [Presentation] Global storm and ocean-eddy resolving earth system models (2022)
  • Author(s): Tomoki Miyakawa and co-authors
  • Organizer: 3rd PAN-GASS meeting understanding and moreling atmospheric processes
  • Int'l Joint Research / Invited
• [Presentation] Recent Progress and Challenges on Global sub-5km mesh Model Experiments from the Sub-seasonal to Climate Scales (2022)
  • Author(s): Takasuka, D. and co-authors
  • Organizer: 6th WGNE workshop on systematic errors in weather and climate models
  • Int'l Joint Research / Invited
• [Presentation] Large ensemble simulation for investigating predictability of precursor vortices of Typhoon Faxai in 2019 with a 14-km mesh global nonhydrostatic atmospheric model (2022)
  • Author(s): Yamada, Y., Miyakawa, T., Nakano, M., Kodama, C., Wada, A., Nasuno, T., ChenY.-C., Yamazaki, A., Yashiro, H., Satoh, M.
  • Organizer: ACM2022
  • Int'l Joint Research / Invited
• [Presentation] Global storm and ocean-eddy resolving earth system models (2022)
  • Author(s): Daniel Klocke and Tomoki Miyakawa
  • Organizer: Japan Geoscience Union Meeting 2022
  • Int'l Joint Research / Invited
• [Presentation] Findings and insights from the DYAMOND project (2022)
  • Author(s): Tomoki Miyakawa, Daniel Klocke, Florian Ziemen, Julia Duras
  • Organizer: Modelling the Climate System at Ultra-High-Resolution workshop
  • Int'l Joint Research / Invited
• [Presentation] Climate of high obliquity terrestrial planets with 3D cloud resolving model (2022)
  • Author(s): Takanori Kodama, Daisuke Takasuka, Sam Sheriff-Tadano, Takeshi Kuroda, Tomoki Miyakawa, Ayako Abe-Ouchi, Masaki Satoh
  • Organizer: Forming and Exploring Habitable Worlds Meeting 2022
  • Int'l Joint Research
• [Presentation] Climate of high obliquity exo-terrestrial planets with 3D cloud resolving climate model (2022)
  • Author(s): Takanori Kodama, Daisuke Takasuka, Sam Sheriff-Tadano, Takeshi Kuroda, Tomoki Miyakawa, Ayako Abe-Ouchi, Masaki Satoh
  • Organizer: Japan Geoscience Union Meeting 2022
  • Int'l Joint Research
• [Presentation] Global sub-5km mesh Model Intercomparison (DYAMOND2) and Highlighted Experiments on Supercomputer Fugaku (2022)
  • 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
  • Int'l Joint Research
• [Presentation] 全球雲解像モデルを用いた高自転軸傾斜角を持った系外地球型惑星の気候 (2022)
  • Author(s): 小玉 貴則, 高須賀 大輔, シェリフ多田野 サム, 黒田 剛史, 宮川 知己, 阿部 彩子, 佐藤 正樹
  • Organizer: 日本惑星科学会 秋季講演会
• [Presentation] Model Improvement (2022)
  • Author(s): Tomoki Miyakawa
  • Organizer: WCRP workshop on Future of Climate Modelling
  • Int'l Joint Research / Invited
• [Presentation] Introduction to the Ocean-Coupled Components of DYAMOND2, the Inter-Comparison Project for Global “Storm-Resolving” Numerical Models (2021)
  • 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
  • Int'l Joint Research / Invited
• [Presentation] 全球雲解像海洋結合モデルNICOCO 現状と展望 (2021)
  • Author(s): 宮川知己
  • Organizer: 海洋学会2021年度秋季大会共催シンポジウム
  • Invited
• [Presentation] Towards S2S-scale Large-ensemble Prediction Using Global Cloud/cloud-system Resolving Model NICAM on Fugaku (2021)
  • 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
  • Int'l Joint Research
• [Presentation] Overview of global scale large ensemble simulations using NICAM on Fugaku (2021)
  • 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
  • Int'l Joint Research
• [Presentation] From K to Fugaku: activities toward extended-range prediction using NICAM/NICOCO (2020)
  • Author(s): Miyakawa, T.
  • Organizer: JpGU 2020
  • Int'l Joint Research
• [Presentation] Dependence of the reproducibility of the MJO convection on differences in the surface flux conditions in NICAM (2020)
  • Author(s): Suematsu, T., Kodama, C., Yashiro, H., Yanase, T., Miura, H., Miyakawa, T., Satoh, M.
  • Organizer: JpGU 2020
  • Int'l Joint Research
• [Presentation] 確率台風モデルを用いた台風季節予報の可能性調査 (2020)
  • Author(s): 片山卓彦, 水島佳緒，今田由紀子，宮川知己，木本昌秀
  • Organizer: 日本気象学会 2020秋季大会
• [Presentation] Resolution dependencies of tropical convection in global cloud/cloud-system resolving NICAM. (2019)
  • Author(s): Tomoki MIYAKAWA and Hiroaki MIURA
  • Organizer: AOGS 16th Annual Meeting
  • Int'l Joint Research
• [Presentation] 大規模アンサンブル実験結果を用いた台風季節予報の可能性調査② (2019)
  • Author(s): 片山卓彦，水島佳緒，千葉丈太郎，吉田康平，宮川知己，木本昌秀
  • Organizer: 日本気象学会2019秋季大会