Long-term changes of greenhouse gases in the ocean and their feedback effects on the climate

• Project Area: Linkages in biogeochemical cycles between surface ocean and lower atmosphere
• Project/Area Number: 18067002
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Hokkaido University
• Principal Investigator: WATANABE Yutaka Hokkaido University, 大学院・地球環境科学研究院, 准教授 (90333640)
• Co-Investigator(Kenkyū-buntansha): YASUDA Ichiro 東京大学, 大気海洋研究所, 教授 (80270792) ; TSURUSHIMA Nobuo 独立行政法人産業技術総合研究所, 研究員 (40357538)
• Project Period (FY): 2006 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥63,100,000 (Direct Cost: ¥63,100,000); Fiscal Year 2010: ¥7,400,000 (Direct Cost: ¥7,400,000); Fiscal Year 2009: ¥10,100,000 (Direct Cost: ¥10,100,000); Fiscal Year 2008: ¥8,800,000 (Direct Cost: ¥8,800,000); Fiscal Year 2007: ¥13,000,000 (Direct Cost: ¥13,000,000); Fiscal Year 2006: ¥23,800,000 (Direct Cost: ¥23,800,000)
• Keywords: 化学海洋学 / 海洋環境変動 / 温室効果ガス / 長期変動 / フィードバック効果

Research Abstract

In order to clarify the long-term climate change in the North Pacific, we carried out the comprehensive ocean observations with physical-biological-chemical systems. Based on these observations, we had significant quantifications of ocean biogeochmical cycles with the parameterizations of greenhouse gases in this region. In addition, we could reconstruct the long-term climate change in this region by using improved ocean circulation models.

Research Products

• [Journal Article] Recent change in the oceanic uptake rate of anthropogenic carbon in the North Pacific subpolar region determined by using a C-13 time series. (2011)
  • Author(s): Watanabe, Y.W., et al.
  • Journal Title: J.Geophys.Res. 116
  • Peer Reviewed
• [Journal Article] Recent change in the oceanic uptake rate of anthropogenic carbon in the North Pacific subpolar region determined by using a C-13 time series (2011)
  • Author(s): Watanabe, Y.W., et al.
  • Journal Title: Journal of Geophysical Research Volume: 116
  • Peer Reviewed
• [Journal Article] Flux of low salinity water from Aniva Bay (Sakhalin Island) in the southern Okhotsk Sea (2011)
  • Author(s): Oguma, S., Ono, T., Watanabe, Y.W., et al.
  • Journal Title: Estuarine Coastal and Shelf Science Volume: 91 Pages: 24-32
  • Peer Reviewed
• [Journal Article] オホーツク海と太平洋をつなぐ物質循環:潮汐混合のインパクト (2011)
  • Author(s): 渡辺豊
  • Journal Title: 月刊海洋 Volume: (印刷中)
• [Journal Article] Bidecadal variability in the Bering Sea and the relation with 18.6 year period nodal tidal cycle. (2010)
  • Author(s): Osafune, S., Yasuda, I.
  • Journal Title: J.Geophys.Res. 115
  • Peer Reviewed
• [Journal Article] Bidecadal variability in the Bering Sea and the relation with 18.6 year period nodal tidal cycle (2010)
  • Author(s): Osafune, S., Yasuda, I.
  • Journal Title: Journal of Geophysical Research Volume: 115
  • Peer Reviewed
• [Journal Article] Horizontal transport of the calanoid copepod Neocalanus in the North Pacific : The influences of the current system and the life history (2010)
  • Author(s): Tatebe, H., Yasuda, I., et al.
  • Journal Title: Deep-Sea Research I Volume: 57 Pages: 409-419
  • Peer Reviewed
• [Journal Article] Estimate of non-tidal exchange transport between the Sea of Okhotsk and the North Pacific (2010)
  • Author(s): Katsumata, K., Yasuda, I.
  • Journal Title: Journal of Oceanography Volume: 66 Pages: 489-504
  • NAID: 10029033436
  • Peer Reviewed
• [Journal Article] Fine- and microstructure observations in the Urup Strait, Kuril Islands, during August of 2006 (2010)
  • Author(s): Itoh, S., Yasuda, I., et al.
  • Journal Title: Journal of Geophysical Research Volume: 115
  • Peer Reviewed
• [Journal Article] Seasonal characteristics of the nitrogen isotope biogeochemistry of settling particles in the western subarctic Pacific : a model study (2010)
  • Author(s): Shigemitsu, M., Watanabe, Y.W., et al.
  • Journal Title: Earth Planetary Sci.Lett. (掲載確定・印刷中)
  • Peer Reviewed
• [Journal Article] Influence of riverine alkalinity on carbon species in the Okhotsk Sea. (2009)
  • Author(s): Watanabe, Y. W., et al.
  • Journal Title: Geophys.Res.Lett. 36
  • Peer Reviewed
• [Journal Article] The 18.6-year period moon-tidal cycle in Pacific Decadal Oscillation reconstructed from tree-rings in western North America (2009)
  • Author(s): Yasuda, I.
  • Journal Title: Geophys.Res. Lett. 36
  • Peer Reviewed
• [Journal Article] Influence of riverine alkalinity on carbon species in the Okhotsk Sea (2009)
  • Author(s): Watanabe, Y.W, et al.
  • Journal Title: Geophys.Res.Lett. 36
  • Peer Reviewed
• [Journal Article] Physical behaviours of iron fertilized patch in SEEDS II (2009)
  • Author(s): Tsumune, D., Watanabe, Y.W., et al.
  • Journal Title: Deep-Sea Res.II 56 Pages: 2948-2957
  • Peer Reviewed
• [Journal Article] Sedimentary inorganic nitrogen and its isotope ratio in the western subarctic Pacific over the last 145 kyr (2009)
  • Author(s): Shigemitsu, M., Watanabe, Y.W., et al.
  • Journal Title: J.Oceanogr. 65 Pages: 541-548
  • Peer Reviewed
• [Journal Article] Identifying crucial issues in climate science : drastic change in the earth system during global warming (2009)
  • Author(s): Ikeda, M., Y.W., et al.
  • Journal Title: EOS Transactions 90 Pages: 15-15
  • Peer Reviewed
• [Journal Article] The 18.6-year period moon-tidal cycle in Pacific Decadal Oscillation reconstructed from tree-rims in western North America (2009)
  • Author(s): Yasuda, I.
  • Journal Title: Geophys.Res.Lett. 36
  • Peer Reviewed
• [Journal Article] Transport and environmental temperature variability of eggs and larvae of the Japanese anchovy(Engraulis japonicus)and Japanese sardine(Sardinops melanostictus)in the western North Pacific estimated vianumerical particle tracking experiments (2009)
  • Author(s): Itoh, S., Yasuda, I., et al.
  • Journal Title: Fish.Oceanogr. 18 Pages: 118-133
  • NAID: 10026359606
  • Peer Reviewed
• [Journal Article] Possible mechanisms of decadal scale variations in PO_4 concentration in the Oyashio and Kuroshio-Oyashio Transition waters, western North Pacific (2009)
  • Author(s): Tadokoro, K., Yasuda, I., et al.
  • Journal Title: Geophys.Res.Lett. 36
  • Peer Reviewed
• [Journal Article] Distribution and modification of North Pacific Intermediate Water around the Subarctic frontal zone east of 150°E (2009)
  • Author(s): Masujima, M., Yasuda, I., et al.
  • Journal Title: J.Phys.Oceanogr. 39 Pages: 1462-1474
  • Peer Reviewed
• [Journal Article] Transport of subarctic large copepods from the Oyashio area to the mixed water region by Oyashio intrusions (2009)
  • Author(s): Shimizu, Y., Yasuda, I., et al.
  • Journal Title: Fish.Oceanogr. 18 Pages: 312-327
  • Peer Reviewed
• [Journal Article] The 18.6-year period moon-tidal cycle in Pacific Decadal Oscillation reconstructed from tree-rings in western North America (2009)
  • Author(s): Yasuda, I
  • Journal Title: Geophysical Research Letters 36(DOI : 10. 1029/2008GL036880. )
  • Peer Reviewed
• [Journal Article] Recent trend of chlorophyll-a over the western North Pacific region (2009)
  • Author(s): Ishida, h., Watanabe, Y. W., et.al.
  • Journal Title: Journal of Oceanography 65 Pages: 179-186
  • Peer Reviewed
• [Journal Article] The 18.6-year period moon-tidal cycle in Pacific Decadal Oscillation reconstructed from tree-rings in western North America (2009)
  • Author(s): Yasuda, I.
  • Journal Title: Geophysical Research Letters 36
  • Peer Reviewed
• [Journal Article] Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region (2008)
  • Author(s): Watanabe, Y.W., Shigemitsu, M., Tadokoro, K.
  • Journal Title: Geophys.Res.Lett. 35
  • Peer Reviewed
• [Journal Article] Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region (2008)
  • Author(s): Watanabe, Y. W. , Shigemitsu, M. , Tadokoro, K.
  • Journal Title: Geophysical Research Letters 35(DOI : 10. 1029/2007GL032188. )
  • Peer Reviewed
• [Journal Article] Time series of multiple chemical parameters of CO_2 in Otaru coast in Hokkaido, Japan : Evidence of the important role of coastal region for CO_2 flux between air and Sea (2008)
  • Author(s): Sakamoto, A., Watanabe, Y. W., et.al.
  • Journal Title: Estuarine, Coastal and Shelf Science 79 Pages: 377-386
  • Peer Reviewed
• [Journal Article] Time variations of δ ^<15>N of organic nitrogen in deep western subarctic Pacific over the last 145 kyr (2008)
  • Author(s): Shigemitsu, M., Watanabe, Y. W., et.al.
  • Journal Title: Geochemistry, Geophysics, Geosystems 9(10)
  • Peer Reviewed
• [Journal Article] Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region (2008)
  • Author(s): Watanabe, Y. W.
  • Journal Title: Geophysical Research Letters 35
  • Peer Reviewed
• [Journal Article] Reconstruction of sea surface dimethylsulfide in the North Pacific during 1970s to 2000s (2007)
  • Author(s): Watanabe, Y. W. , et al.
  • Journal Title: Marine Chemistry 103(DOI : 10. 1016/j. marchem. 2006. 10. 004. ) Pages: 347-358
  • Peer Reviewed
• [Journal Article] A high accuracy method for determining nitrogen, argon and oxygen in seawater (2007)
  • Author(s): Tanaka, S. S. , and Watanabe, Y. W.
  • Journal Title: Marine Chemistry 106(DOI : 10. 1016/j. marchem. 2007. 05. 005. ) Pages: 516-529
  • Peer Reviewed
• [Journal Article] Ba, Si, U, Al, Sc, La, Th, C and C-13/C-12 in a sediment core in the Western subarctic Pacific as proxies of past biological production (2007)
  • Author(s): Shigemitsu, M.
  • Journal Title: Marine Chemistry 106 Pages: 442-455
  • Peer Reviewed
• [Journal Article] A high accuracy method for determining nitrogen, argon and oxygen in seawater (2007)
  • Author(s): Tanaka, S. S.
  • Journal Title: Marine Chemistry 106 Pages: 516-529
  • Peer Reviewed
• [Journal Article] Reconstruction of dimethylsulfide in the North Pacific surface water during 1970s to 2000s. (2007)
  • Author(s): Watanabe, Y. W.
  • Journal Title: Marine Chemistry 103 Pages: 347-358
• [Journal Article] Evidence of increase of oceanic fixed nitrogen with decadal climate change in high productive region (2007)
  • Author(s): Watanabe, Y. W.
  • Journal Title: Geophysical Research Letters (投稿中)
• [Journal Article] Possible explanation linking 18.6-year period nodal tidal cycle with bi-decadal variations of ocean and climate in the North Pacific (2006)
  • Author(s): Yasuda, I. , Osafune, S. , Tatebe, T.
  • Journal Title: Geophysical Research Letters 33(DOI : 10. 1029/2005GL025237. )
  • Peer Reviewed
• [Journal Article] Possible explanation linking 18. 6-year period nodal tidal cycle with bi-decadal variations of ocean and climate in the North Pacific. (2006)
  • Author(s): Yasuda, I.
  • Journal Title: Geophysical Research Letters 33
• [Journal Article] Bidecadal variability in the intermediate waters of the northwestern subarctic Pacific and the Okhotsk Sea in relation to 18.6-year period nodal tidal cycle (2006)
  • Author(s): Osafune, S.
  • Journal Title: Journal of Geophysical Research 111
• [Presentation] Estimate of denitrification in the Okhotsk Sea by using oceanic excess nitrogen. (2011)
  • Author(s): Itoh, M., Watanabe, Y.W., et al.
  • Organizer: European Geophysical Union 2011 meeting.
  • Place of Presentation: Vienna, Austria
• [Presentation] Estimate of denitrification in the Okhotsk Sea by using oceanic excess nitrogen (2010)
  • Author(s): Ito, M., Watanabe, Y.W., et al.
  • Organizer: European Geophysical Union 2011 meeting
  • Place of Presentation: Austria Center Vienna(オーストリア、ウィーン)(招待講演)
  • Year and Date: 2010-04-05
• [Presentation] N2 excess を用いたオホーツク海における脱窒過程の見積り (2010)
  • Author(s): 伊藤昌稚、渡邉豊, ら
  • Organizer: 日本海洋学会
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2010-03-28
• [Presentation] 世界の海洋における溶存窒素・アルゴン分布を用いた preformed 酸素濃度の見積り (2010)
  • Author(s): 田中伸一、渡邉豊, ら
  • Organizer: 日本海洋学会
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2010-03-27
• [Presentation] 北太平洋の炭素循環に対するオホーツク海の影響 (2010)
  • Author(s): 渡辺豊
  • Organizer: 2010年度日本海洋学会秋季大会シンポジウム「オホーツク海を起源とする熱塩・物質循環システムとその変動
  • Place of Presentation: 東京農業大学オホーツクキャンパス、網走
• [Presentation] 潮汐混合過程と水塊変質・長期変動 (2010)
  • Author(s): 安田一郎
  • Organizer: 2010年度日本海洋学会春季大会シンポジウム「太平洋における物質循環のキープロセス」
  • Place of Presentation: 東京海洋大学、東京
• [Presentation] Remarkable increases of Alkalinily and pH in the Okhotsk Sea during the 1990s and2000s. Remarkable increases of Alkalinity and pH in the Ok hotsk Sea during the 1990s and 2000s (2008)
  • Author(s): Watanabe, Y. W., et.al.
  • Organizer: The Annual Meeting of Asia Oceania Geosciences Society
  • Place of Presentation: Busan Exhibition & Convention Center(釜山、韓国)
  • Year and Date: 2008-06-16
• [Presentation] Remarkable increases of Alkalinity and pH in the Okhotsk Sea during the 1990s and 2000s. Remarkable increases of Alkalinity and pH in the Okhotsk Sea during the 1990s and 2000s. (2008)
  • Author(s): Watanabe, Y.W., et al.
  • Organizer: The Annual Meeting of Asia Oceania Geosciences Society
  • Place of Presentation: Busan, Korea
• [Presentation] 北西部北太平洋における海水中のジメチルサルファイドの鉛直分布の解明に関する研究 (2008)
  • Author(s): 本間則仁、渡辺豊、坂本愛
  • Organizer: 2008年度日本地球化学会年会
  • Place of Presentation: 東京大学、東京
• [Presentation] 炭素安定同位体を用いた北太平洋における人間活動起源二酸化炭素の吸収量の変動の見積もり (2008)
  • Author(s): 渡辺豊、千葉武史、田中孝幸
  • Organizer: 2008年度日本地球化学会年会
  • Place of Presentation: 東京大学、東京
• [Presentation] 海洋表層における溶存窒素、アルゴン、酸素を用いた正味の酸素生産速度の見積もり (2008)
  • Author(s): 田中伸一、渡辺豊、小埜恒男
  • Organizer: 2008年度日本地球化学会年会
  • Place of Presentation: 東京大学、東京
• [Presentation] Importance of lateral iron transportation from the Sea of Okhotsk to western subarctic Pacific (2008)
  • Author(s): Nishioka, J. , Watanabe, Y. W. , et al.
  • Organizer: The Annual Meeting of Asia Oceania Geosciences Society
  • Place of Presentation: Busan, Korea
• [Presentation] Decadal change in N/P/Si ratio over the North Pacific subpolar region (2007)
  • Author(s): Watanabe, Y. W.
  • Organizer: North Pacific Marine Science Organization 16th Annual Meeting
  • Place of Presentation: The Victoria Conference Centre, Victoria, Canada
  • Year and Date: 2007-10-30
• [Remarks] 朝日新聞2007年8月31日科学欄「温暖化でやせる海」
• [Remarks] 朝日新聞 2007年8月31日科学欄「温暖化でやせる海」