Decadal variability of mode waters associated with that of the Kuroshio Extension and mesoscale eddies
Project/Area Number |
25287118
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Partial Multi-year Fund |
Section | 一般 |
Research Field |
Meteorology/Physical oceanography/Hydrology
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Research Institution | The University of Tokyo |
Principal Investigator |
OKA Eitarou 東京大学, 大気海洋研究所, 准教授 (60360749)
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Co-Investigator(Kenkyū-buntansha) |
須賀 利雄 東北大学, 理学(系)研究科(研究院), 教授 (70211977)
植原 量行 東海大学, 海洋学部, 教授 (90371939)
辻野 博之 気象庁気象研究所, 海洋・地球化学研究部, 主任研究官 (50343893)
鋤柄 千穂 名古屋大学, 地球水循環研究センター, 機関研究員 (90447128)
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Co-Investigator(Renkei-kenkyūsha) |
HOSODA Shigeki 独立行政法人海洋研究開発機構, 地球環境観測研究開発センター, グループリーダー代理 (60399582)
KOUKETSU Shinya 独立行政法人海洋研究開発機構, 地球環境観測研究開発センター, 主任研究員 (30421887)
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Research Collaborator |
Kutsuwada Kunio
KAWAI Yoshimi
YAMANAKA Goro
NAKANO Hideyuki
SASAI Yoshikazu
Qiu Bo
KOBASHI Fumiaki
TOYAMA Katsuya
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Project Period (FY) |
2013-04-01 – 2017-03-31
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Project Status |
Completed (Fiscal Year 2016)
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Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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Keywords | 北太平洋 / モード水 / サブダクション / 中規模渦 / 黒潮続流 / 十年規模変動 / 海洋物理 / 海洋物理・陸水学 |
Outline of Final Research Achievements |
We have examined the influence of mesoscale phenomena on the subduction of mode waters from winter mixed layers in the Kuroshio Extension region as well as the decadal variability of subduction, by conducting high-resolution shipboard observations and analyzing output of high-resolution numerical models and observation data including Argo profiling float data. We obtained synoptic distributions of Central Mode Water just after formation in the Kuroshio-Oyashio Extension region corresponding to the western part of its formation region. We clarified the subduction of mode waters and nutrient transports associated with fronts and mesoscale eddies. We also demonstrated that the subduction of Subtropical Mode Water varies significantly in association with the decadal variability of Kuroshio Extension, affecting not only physical but also biogeochemical structure in the downstream region.
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Report
(5 results)
Research Products
(78 results)
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[Journal Article] Fukushima-derived radiocesium in the western North Pacific in 20142017
Author(s)
Kumamoto, Y., Aoyama, M., Hamajima, Y., Nagai, H., Yamagata, T., Kawai, Y., Oka, E., Yamaguchi, A., Imai, K., Murata, A.
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Journal Title
Journal of Radioanalytical and Nuclear Chemistry
Volume: 311(2)
Issue: 2
Pages: 1209-1217
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] 134Cs and 137Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part one: surface pathway and vertical distributions2015
Author(s)
Aoyama, M., Hamajima, Y., Hult, M., Uematsu, M., Oka, E., Tsumune, D., and Kumamoto, Y.
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Journal Title
Journal of Oceanography
Volume: 72
Issue: 1
Pages: 53-65
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] A comprehensive, simultaneous ocean and atmosphere observation north of the Kuroshio Extension in autumn 20092014
Author(s)
Naoto Iwasaka, Fumiaki Kobashi, Kazuyuki Uehara, Eitarou Oka, Masanori Konda, Toshiyuki Murayama, Youchi Tanimoto, Kunio Kutsuwada, Masahisa Kubota, and Keita Suzuki
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Journal Title
Umi to Sora
Volume: 89
Pages: 99-114
NAID
Related Report
Peer Reviewed
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[Presentation] A long-term reference for detecting oceanic variations in the western North Pacific: JMA 50-year long 137°E repeat hydrographic section2016
Author(s)
Nakano, T., H. Inoue, K. Murakami, Y. Takatani, A. Kojima, Y. Kitamura, M. Ishii, E. Oka, S. Sugimoto, and T. Suga
Organizer
PICES 2016 Annual Meeting “25 Years of PICES: Celebrating the Past, Imagining the Future”
Place of Presentation
サンディエゴ(米国)
Year and Date
2016-11-08
Related Report
Int'l Joint Research
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[Presentation] Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry2016
Author(s)
E. Oka, B. Qiu, Y. Takatani, K. Enyo, D. Sasano, N. Kosugi, M. Ishii, T. Nakano, and T. Suga
Organizer
2016 Ocean Sciences Meeting
Place of Presentation
Ernest N. Morial Convention Center, ニューオリンズ, アメリカ
Year and Date
2016-02-22
Related Report
Int'l Joint Research
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[Presentation] Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry2016
Author(s)
E. Oka, B. Qiu, Y. Takatani, K. Enyo, D. Sasano, N. Kosugi, M. Ishii, T. Nakano, and T. Suga
Organizer
CLIVAR/JAMSTEC Workshop on the Kuroshio Current and Extension System: Theory, Observations, and Ocean Climate Modelling
Place of Presentation
JAMSTEC横浜研究所, 横浜
Year and Date
2016-01-13
Related Report
Int'l Joint Research
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[Presentation] Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry2015
Author(s)
E. Oka, B. Qiu, Y. Takatani, K. Enyo, D. Sasano, N. Kosugi, M. Ishii, T. Nakano, and T. Suga
Organizer
A combined GO-SHIP/Argo/ IOCCP conference on physical and biogeochemical measurements of the water column (GAIC 2015)
Place of Presentation
Radisson Blu hotel, ゴールウェイ, アイルランド
Year and Date
2015-09-15
Related Report
Int'l Joint Research
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[Presentation] Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry2015
Author(s)
E. Oka, B. Qiu, Y. Takatani, K. Enyo, D. Sasano, N. Kosugi, M. Ishii, T. Nakano, and T. Suga
Organizer
The 3rd Joint Symposium on Ocean, Coastal, and Atmospheric Sciences between University of Tokyo and University of Hawaii
Place of Presentation
東京大学大気海洋研究所、柏
Year and Date
2015-03-11
Related Report
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