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

2010 Fiscal Year Final Research Report

• 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
• Keywords: 化学海洋学 / 海洋環境変動

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 Pages: C02006,DOI:10.1029/2010JC006199.
  • 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: J.Geophys.Res. 115 Pages: DOI:10.1029/2008JC005110.
  • 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 Pages: doi:10.1029/2009GL038672.
  • 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 Pages: L05605,DOI:10.1029/2008GL036880.
  • 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 Pages: L01602,DOI:10.1029/2007GL032188.
  • Peer Reviewed
• [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
  • Year and Date: 20110400
• [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
  • Year and Date: 20100900
• [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
  • Year and Date: 20100300
• [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
  • Year and Date: 20080616-20080620
• [Remarks] 朝日新聞2007年8月31日科学欄「温暖化でやせる海」