Paleoceanography for future prediction : a possibility of climate mode jump with global warming

2010 Fiscal Year Final Research Report

• Project/Area Number: 18101001
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Tokyo
• Principal Investigator: TADA Ryuji 東京大学, 大学院・理学系研究科, 教授 (30143366)
• Co-Investigator(Kenkyū-buntansha): YOKOYAMA Yusuke 東京大学, 大気海洋研究所, 准教授 (10359648) ; HARADA Naomi (独)海洋研究開発機構, 地球環境変動領域, チームリーダー (70344281) ; UCHIDA Masao (独)国立環境研究所, 化学環境研究領域, 研究員 (50344289) ; KIMOTO Katsunori (独)海洋研究開発機構, 地球環境観測究センター, 研究員 (40359162) ; SAKAMOTO Tatsuhiko (独)海洋研究開発機構, 地球内部変動研究センター, グループ・リーダー (90271709)
• Co-Investigator(Renkei-kenkyūsha): 木元 克典 海洋研究開発機構, 地球環境観測研究センター ; 長島 佳菜 海洋研究開発機構, 地球環境観測研究センター ; 岡崎 祐典 海洋研究開発機構, 地球環境観測研究センター ; 板木 拓也 産業総合研究所
• Project Period (FY): 2006 – 2010
• Keywords: 気候モードジャンプ / 東アジアモンスーン / 偏西風 / 古海洋 / 近未来予測

Research Abstract

Changes in behaviors of East Asian monsoons and westerly jet axis since the last interglacial period were reconstructed using piston cores retrieved from the NW Pacific, and their relation with millennial-scale climatic changes in the North Atlantic were examined. The results suggest that changes in the position of westerly jet played a role of linking changes in East Asian monsoons with climatic changes in the Northern Atlantic. The results further suggest that the phase relation between changes in the North Atlantic climate and East Asian monsoons reversed between the last glacial and the Holocene. Ventilation rate of North Pacific Intermediate Water also varied in association with these changes during the last glacial period. The results of the last interglacial reconstruction further suggest that westerly jet axis and East Asian monsoon front may shift northward in response to the global warming.

Research Products

• [Journal Article] Abrupt changes ofintermediate water properties on the northeastern slope of the Bering Sea during the last glacial and deglacial period (2012)
  • Author(s): Rella, S., Tada, R., Nagashima, K., Ikehara, M., Itaki, T., Ohkushi, K., Sakamoto, T., Harada, N., Uchida, M.
  • Journal Title: Paleoceanography Volume: (accepted)
• [Journal Article] Sea surface and subsurface temperature changes in the Okhotsk Sea and adjacent North Pacific during the Last Glacial Maximum and deglaciation (2012)
  • Author(s): Harada N., Sato, M., Seki, O., Timmermann, A., Moossen, H., Bendle, J., Nakamura, Y., Kimoto, K., Okazaki, Y., Nagashima, K., Gorbarenko, S. A., Ijiri, A., Nakatsuka, T., Menviel, L., Chikamoto, M. O., Abe-Ouchi, A., Schouten, S.
  • Journal Title: Deep-Sea Res. II Pages: 61-64, 93-105
  • DOI: 10.1016/j.dsr2.2011.12.007
• [Journal Article] Millennial-scale variations of thelate Pleistocene radiolarians in the Bering Searelated to environments in shallow and deep waters (2012)
  • Author(s): Itaki, T., Kim, S., Rella, S., Uchida, M., Tada, R., Khim, B. K.
  • Journal Title: Deep Sea Res. II Pages: 61-64, 127-144
  • DOI: 10.1016/j.dsr2.2011.03.002
• [Journal Article] Hasegawa, H. Millennial-scale oscillations of the westerly jet path during the last glacial period (2011)
  • Author(s): Nagashima K., Tada R., Tani A., Sun Y., Isozaki, Y., Toyoda, S.
  • Journal Title: Journal of Asian Earth Sciences Volume: 40 Pages: 1214-1220
  • DOI: 10.1016/j.jseaes.2010.08.010
• [Journal Article] Variations of East Asian monsoon since the last deglaciation based on Mg/Ca and oxygen isotope of planktic foraminifera in the northern East China Sea (2010)
  • Author(s): Kubota, Y., Kimoto, K., Tada, R., Oda, H., Yokoyama, Y., Matsuzaki, H.
  • Journal Title: Paleoceanography Volume: 25 Pages: 4205
  • DOI: DOI:10.1029/2009PA001891
• [Journal Article] Deep water formation in the North Pacific during the last glacial termination (2010)
  • Author(s): Okazaki, Y., Timmermann, A., Menviel, L., Harada, N., Abe-Ouchi, A., Chikamoto, M. O., Mouchet, A., Asahi, H.
  • Journal Title: Science Volume: 329 Pages: 200-204
  • DOI: DOI:10.1126/science.1190612
• [Journal Article] Paleotemperature response to monsoon activity in the Japan Sea during the last 160kyr (2009)
  • Author(s): Fujine, K., Tada, R., Yamamoto, M.
  • Journal Title: Palaeogeograph., Palaeoclimatol., Palaeoecol. Volume: 280 Pages: 350-360
  • DOI: 10.1016/j.palaeo.2009.06.022
• [Journal Article] Freshwater impacts recorded in tetraunsaturated alkenones and alkenone-SSTs from the Okhotsk Sea across millennial-scale cycles (2008)
  • Author(s): Harada, N., Sato, M., Sakamoto, T.
  • Journal Title: Paleoceanography Volume: 23 Pages: 3201
  • DOI: DOI:10.1029/2006PA001410
• [Journal Article] Orbital-and millennial-scale changes of radiolarian assemblages during the last 220kyrsn the Japan Sea (2007)
  • Author(s): Itaki. T., Komatsu. N., Motoyama, I.
  • Journal Title: Palaeogeogr. Palaeoclimatol. Palaeoecol. Volume: 247 Pages: 115-130
  • DOI: 10.1016/j.palaeo.2006.11.025
• [Journal Article] Millennial-Scale fluctuations in seasonal sea-ice and deep-water formation in the Japan Sea during the late Quaternary (2007)
  • Author(s): Ikehara, K., Itaki, T.
  • Journal Title: Palaeogeograph., Palaeoclimatol., Palaeoecol. Volume: 247 Pages: 131-143
  • DOI: 10.1016/j.palaeo.2006.11.026
• [Journal Article] Mil1enial-scale variations in Asian withter monsoon and westerly during the last 150kys deduced from eolian grain size (2007)
  • Author(s): Nagashima, K., Tada, R., et. al.
  • Journal Title: Palaeogeograph., Palaeoclimatol., Palaeoecol. Volume: 247 Pages: 144-161
  • DOI: DOI:10.1016/j.palaeo.2006.11.027
• [Journal Article] Millennial-scale variations of sea-ice expansion in the southwestern part of the Okhotsk Sca during the past 120 kys : Age modeland ice-rafted debris in IMAGES Core MD01-2412 (2006)
  • Author(s): Sakamoto, T., Ikehara, M., Uchida, M., Aoki, K., Shibata, Y., Kanamatsu, K., Harada, N., Iijima, K., Katsuki, K., Takahashi, K., Sakai, H., Kawahata, H.
  • Journal Title: Global and Planetary Change Volume: 53 Pages: 58-77
  • DOI: 10.1016/j.gloplacha.2006.01.012
• [Presentation] Probable change in the millennial-scale variation pattern of East Asian summer monsoon between the last glacial and the Holocene and its association with westerly jet oscillations (2011)
  • Author(s): Tada, R., Nagashima, K., and Kubota, Y.
  • Organizer: XVIIIINQUA Congress 2011
  • Place of Presentation: Bern, Switzerland
  • Year and Date: 20110721-27
• [Presentation] Possible increase in reservoir age of the surface water in the northwestern Bering Sea during the deglacial period : Evidence of ascending the aged North Pacific deepwater? (2009)
  • Author(s): Tada, R., Rella, S., Uchida, M., Itaki, T., Nagashima, K., Harada, N.
  • Organizer: AGU fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20091215-19
• [Presentation] Provenance of eolian dust and reconstruction of millennial-scale atmospheric circulation changes in East Asia during the last glacial to the Holocene (2009)
  • Author(s): Tada, R., Isozaki, Y., Nagashima, K., Kubota, Y., Sun, Y., Zheng, H., Toyoda, S.
  • Organizer: 1st PAGES ADOM Workshop on "High-mid latitude northern hemisphere atmospheric circulation"
  • Place of Presentation: Hyeres, France
  • Year and Date: 20091101-04
• [Presentation] Millennial scale changes in intermediate depth circulation recorded in the sediment cores from the onrthwestern North Pacific (2009)
  • Author(s): 原田尚美,木元克典,岡崎裕典,長島佳菜
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 千葉
  • Year and Date: 2009-05-19
• [Presentation] Extending the Record of Millennial-scale Variability of East Asian summer Monsoon Back to 650 ka and Beyond (2008)
  • Author(s): Tada, R., Lavidalie, N., Nagashima, K., and Yokoyama Y.
  • Organizer: American Geophysical union 2008 fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2008-12-15
• [Remarks]
  • URL: http://www-sys.eps.s.u-tokyo.ac.jp/-tada/project-1.html