Paleoceanography in the North Pacific during Pliocene warm period

• Project/Area Number: 24310019
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Kyushu University
• Principal Investigator: OKAZAKI Yusuke 九州大学, 学内共同利用施設等, 准教授 (80426288)
• Co-Investigator(Kenkyū-buntansha): TAKAHASHI Kozo 北星学園大学, 社会福祉学部, 教授 (30244875) ; SEKI Osamu 北海道大学, 低温科学研究所, 准教授 (30374648) ; SAKAMOTO Tatsuhiko 三重大学, 生物資源学研究科, 教授 (90271709) ; IKEHARA Minoru 高知大学, 自然科学系, 准教授 (90335919)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2013: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2012: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
• Keywords: 新生代後期 / 太平洋 / 海洋ゲートウェイ / データ‐モデル統合 / 鮮新世温暖期 / データ・モデル統合

Outline of Final Research Achievements

Late Neogene paleoceanographic changes in the North Pacific were reconstructed using drilling sediments to understand the role of the Panama and Bering gateways in the late Neogene climate changes. We found major cooling event at ~2 Ma in the subarctic Pacific based on alkenone SST and siliceous microfossils. And we suggest a reorganization of ocean circulation during late Miocene based on carbon isotopic compositions of epibenthic foraminifera. We published 11 papers and submitted a drilling proposal to IODP based on this study.

Research Products

• [Journal Article] Orbital-scale benthic foraminiferal oxygen isotope stratigraphy at the northern Bering Slope (IODP Expedition 323 Site U1343) (2015)
  • Author(s): Asahi, H., S. Kender, M. Ikehara, T. Sakamoto, K. Takahashi, A.C. Ravelo, C.A. Alvarez Zarikian, B.K. Khim, and M.J. Leng
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 66-83
  • DOI: 10.1016/j.dsr2.2014.01.004
  • Peer Reviewed
• [Journal Article] Pliocene to Pleistocene radiolarian biostratigraphy and paleoceanography at IODP Site U1341 in the Bering Sea (2015)
  • Author(s): Ikenoue, T., Y. Okazaki, K. Takahashi and T. Sakamoto
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 38-55
  • DOI: 10.1016/j.dsr2.2015.03.004
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Paleoproductivity and paleoceanography of the last 4.3 Myrs at IODP Expedition 323 Site U1341 in the Bering Sea based on biogenic opal content (2015)
  • Author(s): Iwasaki, S., K. Takahashi, Y. Kanematsu, H. Asahi, J. Onodera and A. C. Ravelo
  • Journal Title: Deep-Sea Research II Volume: 未定
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pliocene and Pleistocene paleoceanography in the western subarctic Pacific based on diatom analyses of ODP Leg 145 Hole 884B and IODP Expedition 323 Holes U1341B and U1343E (2015)
  • Author(s): Kato, Y., J. Onodera, I. Suto, A. Teraishi, and K. Takahashi
  • Journal Title: Deep-Sea Research II Volume: 未定
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Late Pliocene to early Pleistocene (2.4-1.25 Ma) paleoproductivity changes in the Bering Sea: IODP Expedition 323 Hole U1343E (2015)
  • Author(s): Kim, S., B.-K. Khim and K. Takahashi
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 155-162
  • DOI: 10.1016/j.dsr2.2015.04.003
  • Peer Reviewed
• [Journal Article] Diatoms, silicoflagellates, and ebridians at Site U1341 on the western slope of Bowers Ridge, IODP Expedition 323 (2015)
  • Author(s): Onodera, J., K. Takahashi and R. Nagatomo
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 8-17
  • DOI: 10.1016/j.dsr2.2013.03.025
  • Peer Reviewed
• [Journal Article] Carbonate diagenesis in the methane-rich sediments of the Bering Sea continental margin (IODP Expedition 323, Sites U1343-U1345) (2015)
  • Author(s): Pierre, C., M.-M. Blanc-Valleron, S. Caquineau, C. März, A.C. Ravelo, K. Takahashi, C. and Alvarez Zarikian
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 133-144
  • DOI: 10.1016/j.dsr2.2014.03.011
  • Peer Reviewed
• [Journal Article] Diatom, silicoflagellate and ebridian biostratigraphy and paleoceanography in IODP 323 Hole U1343E at the Bering slope site (2015)
  • Author(s): Teraishi, A., I. Suto, J. Onodera and K. Takahashi
  • Journal Title: Deep-Sea Research II Volume: 未定 Pages: 18-28
  • DOI: 10.1016/j.dsr2.2013.03.026
  • Peer Reviewed
• [Journal Article] Changes in biogenic opal productivity with Milankovitch cycles during the last 1.3 Ma at IODP Expedition 323 Sites U1341, U1343, and U1345 in the Bering Sea (2013)
  • Author(s): Kanematsu, Y., K. Takahashi, S. Kim, H. Asahi, and B.-K. Khim
  • Journal Title: Quaternary International Volume: 310 Pages: 213-220
  • DOI: 10.1016/j.quaint.2013.06.003
  • Peer Reviewed
• [Journal Article] Millennial-scale climate change and intermediate watercirculation in the Bering Sea from 90 ka : A high-resolution record from IODP Site U1340 (2013)
  • Author(s): Schlung, S. A., A. C. Ravelo, I.W. Aiello, D. H. Andreasen, M. S. Cook, M. Drake, K. A. Dyez, T. P. Guilderson, J. P. LaRiviere, Z. Stroynowski, and K. Takahashi
  • Journal Title: Paleoceanography Volume: Vol. 28 Issue: 1 Pages: 1-14
  • DOI: 10.1029/2012pa002365
  • Peer Reviewed
• [Journal Article] Biogenic opal production changes during the Mid-Pleistocene Transition in the Bering Sea (IODP Expedition 323 Site U1343) (2013)
  • Author(s): Takahashi, K., S. Kim, B-K Khim, Y. Kanematsu, H. Asahi, and A. C. Ravelo
  • Journal Title: Quaternary Research Volume: (in press) Issue: 1 Pages: 151-157
  • DOI: 10.1016/j.yqres.2013.10.001
  • Peer Reviewed
• [Journal Article] Alkaline leaching characteristics of biogenic opal in drilled cores from the Bering Sea (2012)
  • Author(s): Iwasaki, S., K. Takahashi and Y. Kanematsu
  • Journal Title: Memoirs of the Faculty of Sciences, Kyusyu University, Series D, Earth and Planetary Sciences Volume: 32 Pages: 39-44
  • Peer Reviewed
• [Presentation] 新第三紀後期の北半球寒冷化における高緯度の海洋ゲートウェイ・フィードバック (2015)
  • Author(s): 関宰
  • Organizer: 研究集会「北極における過去の気候・環境変動」
  • Place of Presentation: 国立極地研究所
  • Year and Date: 2015-03-25
• [Presentation] IODP プロポーザル869-Pre太平洋子午面循環と西太平洋ジャイア進化 (2015)
  • Author(s): 岡崎裕典・山本正伸
  • Organizer: 2014年度古海洋・古気候に関するシンポジウム
  • Place of Presentation: 東京大学大気海洋研究所
  • Year and Date: 2015-01-06
• [Presentation] 鮮新世温暖期の気候状態：熱帯暖水プール水温と大気pCO2 問題 (2015)
  • Author(s): 関宰
  • Organizer: 2014年度古海洋・古気候に関するシンポジウム
  • Place of Presentation: 東京大学大気海洋研究所
  • Year and Date: 2015-01-06
• [Presentation] Role of Arctic and Antarctic regions in late Neogene climate evolutions (2014)
  • Author(s): Seki, O., J. Onodera, A. Oka and M. Ikehara
  • Organizer: The Fifth Symposium on Polar Science, National Institute of Polar Research
  • Place of Presentation: 国立極地研究所
  • Year and Date: 2014-12-02 – 2014-12-05
• [Presentation] Miocene to Pleistocene change in deepwater circulation in the western North Pacific (2014)
  • Author(s): Okazaki, Y.
  • Organizer: Asia Oceania Geosciences Society 11th Annual Meeting
  • Place of Presentation: 札幌
  • Year and Date: 2014-08-02
• [Presentation] 中新世以降の北西太平洋深層水塊特性変化：DSDP296サイトより (2014)
  • Author(s): 岡崎裕典・山本窓香・河潟俊吾・池原実
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-04-28
• [Presentation] 北半球高緯度域における沈降粒子フラックスと古海洋環境研究 (2014)
  • Author(s): 高橋孝三
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-04-28
  • Invited
• [Presentation] 珪藻化石群集変動解析による北西太平洋およびベーリング海における鮮新世-更新世古海洋環境復元 (2014)
  • Author(s): 加藤悠爾・小野寺丈尚太郎・須藤斎・寺石瑛人・高橋孝三
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-04-28
• [Presentation] 更新世初期のベーリング海峡閉鎖が長期的な気候変動に与えたインパクト (2014)
  • Author(s): 関宰･小野寺丈尚太郎･池原実･岡崎裕典･河村公隆･高橋孝三
  • Organizer: 2013年度古海洋・古気候に関するシンポジウム
  • Place of Presentation: 東京大学大気海洋研究所
• [Presentation] 中新世以降の北太平洋深層水塊特性変化：DSDP296試料より (2014)
  • Author(s): 岡崎裕典・山本窓香・河潟俊吾・池原実
  • Organizer: 2013年度古海洋・古気候に関するシンポジウム
  • Place of Presentation: 東京大学大気海洋研究所
• [Presentation] 北極海ロモノソフ海嶺IODP Expedition 302およびベーリング海Expedition 323の掘削成果と今後の展望 (2013)
  • Author(s): 高橋孝三
  • Organizer: 研究集会「北極域における過去の気候・環境変動」
  • Place of Presentation: 国立極地研究所(東京都)
  • Year and Date: 2013-03-25
• [Presentation] ベーリング海IODP U1341サイトにおける放散虫生層序と古海洋環境 (2013)
  • Author(s): 岡崎裕典・池上隆仁・高橋孝三
  • Organizer: 2012年度古海洋シンポジウム
  • Place of Presentation: 東京大学大気海洋研究所(千葉県)
  • Year and Date: 2013-01-07
• [Presentation] 更新世初期のベーリング海峡閉鎖の気候インパクト (2013)
  • Author(s): 関宰・小野寺丈尚太郎・池原実・岡崎裕典・河村公隆・高橋孝三
  • Organizer: 2012年度古海洋シンポジウム
  • Place of Presentation: 東京大学大気海洋研究所(千葉県)
  • Year and Date: 2013-01-07
• [Presentation] Pliocene paleoceanography in the Bering Sea: results from IODP Expedition 323 (2013)
  • Author(s): Okazaki, Y., S. Iwasaki, J. Onodera, O. Seki and K. Takahashi
  • Organizer: 2nd workshop on Pliocene climate
  • Place of Presentation: University of Bristol, Bristol, UK
• [Presentation] Refining alkenone pCO2 estimates in the Plio-Pleistocene (2013)
  • Author(s): Osamu Seki
  • Organizer: 2nd workshop on Pliocene climate
  • Place of Presentation: University of Bristol, Bristol, UK
• [Presentation] Paleoceanography of the Bering Sea during the past five million years : results from IODP Expedition 323 (2012)
  • Author(s): Takahashi, K., J. Onodera, H. Asahi, Y. Okazaki, Y. Kanematsu, S. Iwasaki, T. Ikenoue, M. Ikehara, 0. Seki, T. Sakamoto, K. Horikawa, B. K. Khim, S. Kim, A. Teraishi, I. Suto, and A. C. Ravelo
  • Organizer: American Geophysical Union 2012 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-07
• [Presentation] 過去500万年間のベーリング海気候変動-海氷出現と寒冷化-IODP Expedition 323 掘削成果 (2012)
  • Author(s): 高橋孝三・岩崎晋弥・兼松芳幸・小野寺丈尚太郎・岡崎裕典・須藤斎・朝日博史・池上隆仁・坂本竜彦・池原実・関宰・堀川恵司・岡田誠・井尻暁・Ana C, Ravelo ・Carlos A. Zarikian
  • Organizer: 2012年度日本海洋学会秋季大会
  • Place of Presentation: 東海大学清水キャンパス(静岡県)
  • Year and Date: 2012-09-15
• [Presentation] 鮮新世温暖期から完新世に至るベーリング海での成層化の強化 : IODP U1341とU1343の窒索・炭素同位体比変動 (2012)
  • Author(s): 池原実・高仁環
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪府立大学(大阪府)