Model development and impact assessment for ocea circulation, marine material cycles and climate by incorporating the effect of oceanic vertical mixing

• Project Area: Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem
• Project/Area Number: 15H05825
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Complex systems
• Research Institution: The University of Tokyo
• Principal Investigator: 羽角 博康 東京大学, 大気海洋研究所, 教授 (40311641)
• Co-Investigator(Kenkyū-buntansha): 建部 洋晶 国立研究開発法人海洋研究開発機構, 気候モデル高度化研究プロジェクトチーム, ユニットリーダー (40466876) ; 松村 義正 東京大学, 大気海洋研究所, 助教 (70631399) ; 小室 芳樹 国立研究開発法人海洋研究開発機構, 北極環境変動総合研究センター, ユニットリーダー (90396945)
• Project Period (FY): 2015-06-29 – 2020-03-31
• Project Status: Granted (Fiscal Year 2019)
• Budget Amount: ¥95,290,000 (Direct Cost: ¥73,300,000、Indirect Cost: ¥21,990,000); Fiscal Year 2019: ¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000); Fiscal Year 2018: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2017: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2016: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2015: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
• Keywords: 数値モデリング / 太平洋熱塩循環 / 鉛直混合 / 気候変動 / 物質循環

Outline of Annual Research Achievements

以下の６項目について研究を実施した：①高解像度モデルにおける混合過程のパラメータ化手法開発、②混合過程のパラメータ化を取り入れた太平洋モデリング、③混合過程のパラメータ化を取り入れた全球海洋モデリング、④混合過程のパラメータ化を取り入れた気候モデリング、⑤粒子追跡手法に基づく生物地球化学過程モデル開発、⑥太平洋の二酸化炭素吸収および酸性化に関するモデリング。
①では内部波の伝播を陽に考慮する混合過程パラメータ化の開発を開始した。海洋・気候モデリングへの適用については翌年度以降に実施する。②では前年度に実施した高解像度太平洋モデリングの結果を解析し、特に黒潮親潮混乱水域における水塊混合が北太平洋の中層循環に及ぼす影響を調べた。黒潮の振舞に一部非現実的な部分があり、それに伴って中層循環への影響にバイアスが生じてしまったが、混合の影響を定量化することができた。黒潮の振舞については翌年度以降③の中で引き続き実施する。③では全球海洋中深層循環に対して混合過程が及ぼす影響を評価するための数値モデルの設定および予備実験を実施した。上述した黒潮の振舞の問題が残ってはいるが、その解決の見通しを立てることができ、翌年度以降の準備は順調であった。④では高解像度気候モデリングの設定および予備実験を実施した。⑤では前年度までに開発された粒子法に基づく生物地球化学過程モデルを現実的設定の海洋モデリングに適用し、モデルの検証と再検討を実施した。⑥では二酸化炭素の挙動を中心とした物質輸送モデリングを開始した。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

各研究項目で順調にモデル開発および数値実験を実施することができ、当初見込んでいた成果を概ね達成することができた。

Strategy for Future Research Activity

当初計画に沿って、研究項目③（高解像度全球海洋モデリング）、研究項目④（気候モデリング）および研究項目⑥（物質循環モデリング）のプロダクトランに入る。これにより、全球海洋中深層循環に対して混合過程が及ぼす影響の評価、18.6年周期潮汐変動が気候に及ぼす影響の評価、および人為起源二酸化炭素の海洋による吸収と輸送の実態解明を目指す。

Research Products

• [Journal Article] Atmospheric responses and feedback to the meridional ocean heat transport in the North Pacific (2017)
  • Author(s): Tatebe Hiroaki, Kurogi Masao, and Hasumi Hiroyasu
  • Journal Title: Journal of Climate Volume: 30 Pages: 5715-5728
  • DOI: 10.1175/jcli-d-16-0055.1
  • Peer Reviewed
• [Journal Article] A Madden-Julian Oscillation event remotely accelerates ocean upwelling to abruptly terminate the 1997/1998 super El Nino (2017)
  • Author(s): Miyakawa, T., H. Yashiro, T. Suzuki, H. Tatebe, and M. Satoh
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 9489-9495
  • DOI: 10.1002/2017gl074683
  • Peer Reviewed / Open Access
• [Journal Article] Effectiveness and limitations of parameter tuning in reducing biases of top-of-atmosphere radiation and clouds in MIROC version 5 (2017)
  • Author(s): Ogura, T., H. Shiogama, M. Watanabe, M. Yoshimori, T. Yokohata, J. D. Annan, J. C. Hargreaves, N. Ushigami, K. Hirota, Y. Someya, Y. Kamae, H. Tatebe, and M. Kimoto
  • Journal Title: Geoscientific Model Development Volume: 10 Pages: 4647-4664
  • DOI: 10.5194/gmd-10-4647-2017
  • NAID: 120006399134
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Roles of wind stress and thermodynamic forcing in recent trends in Antarctic sea ice and Southern Ocean SST: An ocean-sea ice model study (2017)
  • Author(s): Kusahara Kazuya、Williams Guy D.、Massom Robert、Reid Phillip、Hasumi Hiroyasu
  • Journal Title: Global and Planetary Change Volume: 158 Pages: 103-118
  • DOI: 10.1016/j.gloplacha.2017.09.012
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Responses of Basal Melting of Antarctic Ice Shelves to the Climatic Forcing of the Last Glacial Maximum and CO2 Doubling (2017)
  • Author(s): Obase T, Abe-Ouchi A, Kusahara K, Hasumi H, Ohgaito R
  • Journal Title: Journal of Climate. Volume: 印刷中 Pages: 3473-3497
  • DOI: 10.1175/jcli-d-15-0908.1
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Characteristics and mechanism of deep mesoscale variability south of the Kuroshio Extension (2017)
  • Author(s): Miyamoto Masatoshi、Oka Eitarou、Yanagimoto Daigo、Fujio Shinzou、Mizuta Genta、Imawaki Shiro、Kurogi Masao、Hasumi Hiroyasu
  • Journal Title: Deep-Sea Research Part I Volume: 123 Pages: 110-117
  • DOI: 10.1016/j.dsr.2017.04.003
  • Peer Reviewed
• [Journal Article] Downscaling Global Emissions and Its Implications Derived from Climate Model Experiments (2017)
  • Author(s): Fujimori S., Abe M., Kinoshita T., Hasegawa T., Kawase H., Kushida K., Masui T., Oka K., Shiogama H., Takahashi K., Tatebe H. , Yoshikawa M.
  • Journal Title: PLOS One Volume: 12
  • DOI: 10.1371/journal.pone.0169733
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] South Pacific influence on the termination of El Niño in 2014 (2016)
  • Author(s): Imada, Y., H. Tatebe, M. Watanabe, M. Ishii, and M. Kimoto
  • Journal Title: Scientific Reports Volume: 6 Pages: 30341-30341
  • DOI: 10.1038/srep30341
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] OMIP contribution to CMIP6: experimental and diagnostic protocol for the physical component of the Ocean Model Intercomparison Project (2016)
  • Author(s): S. M. Griffies, G. Danabasoglu, P. J. Durack, Y. Komuro, H. Tsujino, (他 34 名)
  • Journal Title: Geoscientific Model Development Volume: 9 Pages: 3231-3296
  • DOI: 10.5194/gmd-9-3231-2016
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Widespread collapse of the Ross Sea Ice Shelf during the late Holocene (2016)
  • Author(s): Yokoyama, Y., Anderson, J. B., Yamane, M., Simikins, L. M., Miyairi, Y., Yamazaki, T., Koizumi, M., Suga, H., Kusahara, K., Prothro, L., Hasumi, H., Southon, J. R., and Ohkouchi, N.
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 113 Pages: 2354-2359
  • DOI: 10.1073/pnas.1516908113
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Subduction of Pacific Antarctic Intermediate Water in an eddy resolving model (2016)
  • Author(s): Hiraike, Y., Y. Tanaka and H. Hasumi
  • Journal Title: Journal of Geophysical Research Oceans Volume: 121 Pages: 133-147
  • DOI: 10.1002/2015jc010802
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] The inflow of Atlantic water at the Fram Strait and its interannual variability (2016)
  • Author(s): Kawasaki Takao, and Hasumi Hiroyasu
  • Journal Title: Journal of Geophysical Research Oceans Volume: 121 Pages: 502-519
  • DOI: 10.1002/2015jc011375
  • Peer Reviewed
• [Journal Article] Predictability of two types of El Nino assessed using an extended seasonal prediction system by MIROC. (2015)
  • Author(s): Imada, Y., H. Tatebe, M. Ishii, Y. Chikamoto, M. Mori, M. Arai, M. Watanabe and M. Kimoto
  • Journal Title: Mon. Wea. Rev. Volume: 143 Pages: 4597-4617
  • DOI: 10.1175/mwr-d-15-0007.1
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Overturning circulation that ventilates the intermediate layer of the Sea of Okhotsk and the North Pacific: the role of salinity advection (2015)
  • Author(s): Matsuda, J., H. Mitsudera, T. Nakamura, Y. Sasajima, H. Hasumi and M. Wakatsuchi
  • Journal Title: Journal of Geophysical Research Oceans Volume: 120 Pages: 1462-1489
  • DOI: 10.1002/2014jc009995
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Modeling low salinity waters along the coast around Japan using a high resolution river discharge data set (2015)
  • Author(s): Urakawa, L. S., M. Kurogi, K. Yoshimura and H. Hasumi
  • Journal Title: J. Oceanography Volume: 71 Pages: 715-739
  • DOI: 10.1007/s10872-015-0314-4
  • NAID: 40020674283
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Causes of the warming trend of the intermediate water in the Sea of Okhotsk and western subarctic North Pacific from 1980 to 2008 (2015)
  • Author(s): Nakanowatari, T., T. Nakamura, K. Uchimoto, H. Uehara, H. Mitsudera, K.I. Ohshima, H. Hasumi, M. Wakatsuchi
  • Journal Title: Journal of Climate Volume: 28 Pages: 714-735
  • DOI: 10.1175/jcli-d-14-00172.1
  • NAID: 120005624079
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] The Arctic water inflow through the Fram Strait in a climate model (2018)
  • Author(s): Kawasaki Takao
  • Organizer: The 5th International Symposium on Arctic Research
  • Int'l Joint Research
• [Presentation] Reproducibility of BMOC in a global ocean model: sensitivity on isopycnal diffusion scheme (2018)
  • Author(s): Urakawa Shogo
  • Organizer: Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] A preliminary hindcast experiment for CMIP6/OMIP using COCO4.9: comparison with a case forced by a new dataset JRA55-do (2017)
  • Author(s): Komuro Yoshiki
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Global ocean model development for CMIP6 in Meteorological Research Institute and its performance in reproducing ocean general circulation (2017)
  • Author(s): Urakawa Shogo
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Effect of tide-induced mixing on shallow Pacific Ocean circulation (2017)
  • Author(s): Kawasaki Takao
  • Organizer: IAPSO-IAMAS-IAGA Joing Assembly
  • Int'l Joint Research
• [Presentation] Prediction and predictability of the Arctic climate (2017)
  • Author(s): Hasumi Hiroyasu
  • Organizer: Arctic Circle Assembly
  • Int'l Joint Research
• [Presentation] 太平洋深層循環のモデリング研究 (2017)
  • Author(s): 川崎高雄
  • Organizer: 国際沿岸海洋研究センター研究集会
• [Presentation] 気候値外力実験における気象研全球海洋モデルGONDOLA_100の深層循環再現性評価 (2017)
  • Author(s): 浦川昇吾
  • Organizer: 日本海洋学会秋季大会
• [Presentation] Sea ice representation in climate models (2017)
  • Author(s): Hasumi Hiroyasu
  • Organizer: Workshop on Sea Ice Remote Sensing and Modeling
  • Int'l Joint Research
• [Presentation] High resolution modeling on deep Pacific Ocean circulation (2017)
  • Author(s): Kawasaki Takao
  • Organizer: Internal Symposium "Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem"
  • Int'l Joint Research
• [Presentation] Model development and impact assessment for ocean circulation, marine material cycles and climate by incorporating the effect of oceanic vertical mixing (2017)
  • Author(s): Hasumi Hiroyasu
  • Organizer: Internal Symposium "Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem"
  • Int'l Joint Research
• [Presentation] Modeling the Atlantic water inflow to the Arctic Ocean through the Fram Strait and the Barents Sea (2016)
  • Author(s): Kawasaki Takao
  • Organizer: Japan-Norway Arctic Science & Innovation Week
  • Int'l Joint Research
• [Presentation] Lagrangian frazil ice model and its application to a coastal polynya simulation (2016)
  • Author(s): Matsumura Yoshimasa
  • Organizer: Japan-Norway Air-Sea Interaction Workshop
  • Int'l Joint Research
• [Presentation] Ocean modeling study on Atlantic Water inflow to the Arctic Ocean (2016)
  • Author(s): Kawasaki Takao
  • Organizer: Japan-Norway Air-Sea Interaction Workshop
  • Int'l Joint Research
• [Presentation] Arctic physical oceanography in Japan (2016)
  • Author(s): Hasumi Hiroyasu
  • Organizer: Japan-Norway Air-Sea Interaction Workshop
  • Int'l Joint Research
• [Presentation] Centennial climate reanalysis using a climate model MIROC with LETKF system (2016)
  • Author(s): Tatebe Hiroaki
  • Organizer: International workshop on coupled data assimilation
  • Int'l Joint Research
• [Presentation] バレンツ海における水塊変質とその経年変動に関するモデリング研究 (2016)
  • Author(s): 川崎高雄
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] 太平洋深層循環の高解像度モデリング (2016)
  • Author(s): 川崎高雄
  • Organizer: 日本海洋学会秋季大会
• [Presentation] 深層循環に対する海底熱源の影響についての再検証 (2016)
  • Author(s): 浦川昇吾
  • Organizer: 日本海洋学会秋季大会
• [Presentation] 地球温暖化の進行から予期される異常気象発生頻度の変化 (2016)
  • Author(s): 建部洋晶
  • Organizer: 第22回ビジュアリゼーションカンファレンス
• [Presentation] On the development of MIROC6 for the IPCC AR6 (2016)
  • Author(s): Tatebe, H.
  • Organizer: Joint US-Japan workshop on climate change and variability
  • Place of Presentation: San Diego, USA
  • Year and Date: 2016-03-21
  • Int'l Joint Research
• [Presentation] グリーンランド氷河融解水を起源とする高濁度水プルームのモデリング (2016)
  • Author(s): 松村義正、大橋良彦、青木茂、杉山慎
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 東京大学（東京）
  • Year and Date: 2016-03-15
• [Presentation] Interannual variability of Atlantic Water inflow and modification in the Barents Sea (2016)
  • Author(s): Kawasaki, T., and H. Hasumi
  • Organizer: Ocean Sciences Meeting
  • Place of Presentation: New Orleans, USA
  • Year and Date: 2016-02-23
  • Int'l Joint Research
• [Presentation] Modeling sediment entrainment into newly formed sea ice (2015)
  • Author(s): Matsumura, Y., M. Ito and K. I. Ohshima
  • Organizer: The 6th Symposium on Polar Sciences
  • Place of Presentation: 国立極地研究所（立川）
  • Year and Date: 2015-11-19
  • Int'l Joint Research
• [Presentation] Coordinated observational and modeling studies on the basic structure and variability of the Arctic sea ice-ocean system (2015)
  • Author(s): Hasumi, H.
  • Organizer: The 6th Symposium on Polar Sciences
  • Place of Presentation: 国立極地研究所（立川）
  • Year and Date: 2015-11-18
  • Int'l Joint Research
• [Presentation] Slowdown and accelerations of surface global warming due to tropical Pacific internal variability: A multi-model intercomparison (2015)
  • Author(s): Tatebe, H., Y. Kosaka, K. Lestari and Y. Imada
  • Organizer: Workshop on CMIP5 model analysis and scientific plans for CMIP6
  • Place of Presentation: Doubrovnik, Croatia
  • Year and Date: 2015-10-20
  • Int'l Joint Research