Modeling of the Intermediate Circulation and Material Transferin the Pan-Okhotsk Region

2008 Fiscal Year Final Research Report

• Project/Area Number: 18201002
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Hokkaido University
• Principal Investigator: EBUCHI Naoto Hokkaido University, 低温科学研究所, 教授 (10203655)
• Co-Investigator(Kenkyū-buntansha): NAKATSUKA Takeshi 北海道大学, 低温科学研究所, 准教授 (60242880) ; NISHIOKA Jun 北海道大学, 低温科学研究所, 准教授 (90371533) ; MITSUDERA Humio 北海道大学, 低温科学研究所, 教授 (20360943) ; OHSHIMA Keiichirou 北海道大学, 低温科学研究所, 教授 (30185251) ; NAKAMURA Tomohiro 北海道大学, 低温科学研究所, 講師 (60400008)
• Project Period (FY): 2006 – 2008
• Keywords: オホーツク海 / 中層循環 / 物質輸送 / 鉄仮説 / 北太平洋中層水 / 海洋循環モデル / 東樺太海流 / 高密度水

Research Abstract

オホーツク海および北西北太平洋親潮域の高い海洋生物生産性を支えている物質循環のメカニズムを,海洋中層(400~800m)の循環と鉄の輸送過程に注目して,現場観測と数値モデルによる研究を行った.その結果,オホーツク海北西大陸棚起源の鉄分が,海氷の生成とともに作られるオホーツク海中層水によって移送され,千島海峡で広い深度層に分配された後,西部北太平洋に送り出されている様子が定量的に明らかとなった.

Research Products

• [Journal Article] Wind and buoyancy drivenintermediate-layer overturning in theSea of Okhotsk (2009)
  • Author(s): Matsuda, J., H. Mitsudera, T. Nakamura, K. Uchimoto, T. Nakanowatari, and N. Ebuchi
  • Journal Title: Deep-Sea Res (印刷中)
• [Journal Article] Seasonal variation in the in- andoutflow of the Okhotsk Sea with the North Pacific (2009)
  • Author(s): Ohshima, K. I., T. Nakanowatari, S. Riser, and M. Wakatsuchi
  • Journal Title: Deep-Sea Res (印刷中)
• [Journal Article] Direct observationsof sea-ice thickness and brinerejection off Sakhalin in the Sea ofOkhotsk (2009)
  • Author(s): Fukamachi, Y., K. Shirasawa, A. M.Polomoshnov, K. I. Ohshima, E. Kalinin, S. Nihashi, H. Melling, G. Mizuta, M.Wakatsuchi
  • Journal Title: Continental Shelf Res (印刷中)
• [Journal Article] Retrievalof sea ice thickness distribution inthe seasonal ice zone from air-borneL-band SAR. Int'l J (2009)
  • Author(s): Toyota, T., K. Nakamura, S. Uto, K. I. Ohshima, and N. Ebuchi
  • Journal Title: Remote Sens (印刷中)
• [Journal Article] Phytoplankton growth andmicrozooplankton grazing in the Sea ofOkhotsk during late summer of 2006 (2009)
  • Author(s): Liu, H., K. Suzuki, J. Nishioka, R. Sohrin and T. Nakatsuka
  • Journal Title: Deep-Sea Res. I vol.56 Pages: 561-570
• [Journal Article] Subinertialand seasonal and variations in the SoyaWarm Current revealed by HF radars, coastal tide gauges, and bottommounted ADCP (2009)
  • Author(s): Ebuchi, N., Y. Fukamachi, K. I. Ohshima, and M.
  • Journal Title: J. Oceanogr vol.65 Pages: 31-43
• [Journal Article] Diurnal coastal-trapped waves on theeastern shelf of Sakhalin in the Sea of Okhotsk and their modification by seaice (2008)
  • Author(s): Ono, J., K. I. Ohshima, G. Mizuta, Y. Fukamachi, and M. Wakatsuchi
  • Journal Title: Continental Shelf Res vol.28 Pages: 697-709
• [Journal Article] Numerical study of ice-driftdivergence by a cyclonic wind with aLagrangian ice model (2008)
  • Author(s): Kawaguchi, Y., and H. Mitsudera
  • Journal Title: Tellus A vol.60 Pages: 1600-0870
• [Journal Article] Processes influencing irondistributions in the coastal waters of the Tsugaru Strait, Japan (2008)
  • Author(s): Saitoh, Y., K. Kuma, Y. Isoda, H. Kuroda, H. Matsuura, T. Wagawa, H. Takata, N. Kobayashi, S. Nagao and T. Nakatsuka
  • Journal Title: J. Oceanogr vol.64 Pages: 815-830
• [Journal Article] Volume transport of the Soya WarmCurrent revealed by bottom-mountedADCP and ocean-radar measurement (2008)
  • Author(s): Fukamachi, Y., I. Tanaka, K. I. Ohshima, N. Ebuchi, G. Mizuta, H. Yoshida, S. Takayanagi, and M. Wakatsuchi
  • Journal Title: J. Oceanogr vol.64 Pages: 385-392
• [Journal Article] Particle tracking experiments on amodel of the Okhotsk Sea : toward oilspill simulation (2008)
  • Author(s): Ohshima, K. I., and D. Simizu
  • Journal Title: J. Oceanogr vol.64 Pages: 103-114
• [Journal Article] Iron supply to thewestern subarctic Pacific : Importanceof iron export from the sea of Okhotsk (2007)
  • Author(s): Nishioka, J., Tsuneo Ono, H. Saito, T. Nakatsuka, S. Takeda, T. Yoshimura, K. Suzuki, K. Kuma, S. Nakabayashi, D. Tsumune, H. Mitsudera, W. K. Johnson, and A. Tsuda
  • Journal Title: J. Geophys. Res. vol.112
• [Journal Article] Warming and oxygendecrease of intermediate water in thenorthwestern North Pacific, originatingfrom the Sea of Okhotsk (2007)
  • Author(s): Nakanowatari T., K. I. Ohshima, M. Wakatsuchi
  • Journal Title: Geophsy. Res. Lett. vol.34 Pages: 1955-2004
• [Journal Article] Clockwise eddycaused by the Soya Warm Current in an OGCM (2007)
  • Author(s): Uchimoto, K., H. Mitsudera, N. Ebuchi, and Y. Miyazawa
  • Journal Title: J. Oceanogr vol.63 Pages: 379-391
• [Journal Article] Properties of sea ice and overlyingsnow in the southern Sea of Okhotsk (2007)
  • Author(s): Toyota, T., S. Takatsuji, K. Tateyama, K. Naoki, and K. I. Ohshima
  • Journal Title: J. Oceanogr vol.63 Pages: 393-411
• [Journal Article] Water mass exchange and diapycnal mixing at Bussol' Straitrevealed by water mass properties (2007)
  • Author(s): Ono, K., K. I. Ohshima, T. Kono, M. Itoh, K. Katsumata, Y. N. Volkov, and M. Wakatsuchi
  • Journal Title: J. Oceanogr vol.63 Pages: 281-291
• [Journal Article] Seasonal andinterannual variations in the East Sakhalin Current revealed by the TOPEX/POSEIDON altimeter data (2006)
  • Author(s): Ebuchi, N
  • Journal Title: J. Oceanogr vol.62 Pages: 172-183
• [Journal Article] Distribution of N* inthe Sea of Okhotsk and its use as abiogeochemical tracer of Okhotsk SeaIntermediate Water formation process (2006)
  • Author(s): Yoshikawa, C., T. Nakatsuka, and M. Wakatsuchi
  • Journal Title: J. Marine Sys. vol.63 Pages: 49-62
• [Presentation] The importance ofsea-ice formation in the Sea of Okhotskfor supplying iron to the westernsubarctic Pacific (2009)
  • Author(s): Nishioka, J., T. Nakatsuka, K. Kuma, Y. W. Watanabe, T. Ono, K. I. Ohshima, and N. Ebuchi
  • Organizer: ASLO Aquatic Sciences Meeting 2009
  • Place of Presentation: Center de Congres Acropolis, Nice,France
  • Year and Date: 2009-01-29
• [Presentation] Changes in the Sea ofOkhotsk due to global warming-Weakening pump function to the NorthPacific (2008)
  • Author(s): Ohshima, K. I., T. Nakanowatari, T. Nakatsuka, J. Nishioka, and M. Wakatsuchi
  • Organizer: Fourth PICES Workshop on "The Okhotsk Sea and Adjacent Areas,"
  • Place of Presentation: Tokyo University of Agriculture,Abashiri, Japan
  • Year and Date: 2008-08-27
• [Presentation] Subinertialvariations in the Soya Warm Currentrevealed by HF radars, coastal tidegauges, and a bottom-mounted ADCP (2008)
  • Author(s): Ebuchi, N., Y. Fukamachi, K. I. Ohshima, and M. Wakatsuchi
  • Organizer: 2008IEEE International Geoscience & RemoteSensing Symposium
  • Place of Presentation: John B. Hynes Veterans Memorial Convention Center, Boston, Massachusetts, U.S.A
  • Year and Date: 2008-07-10
• [Presentation] Linkage between inlandand open ocean ecosystems by irontransport through river andintermediate water flows -Huge butvulnerable system in the Amur Riverwatershed and the Sea of Okhotsk- (2008)
  • Author(s): Nakatsuka, T., J. Nishioka, and T. Shiraiwa
  • Organizer: Fourth IGBP Congress
  • Place of Presentation: Cape Town international Convention Centre, Cape Town, South Africa
  • Year and Date: 2008-05-08
• [Presentation] Numerical modelingand parameterization of dense shelfwater formation due to brine rejectionover a gentle slope, with anapplication to the Sea of Okhotsk (2008)
  • Author(s): Mitsudera, H., Y. Ikumi, Y. Kawaguchi, T. Nakamura
  • Organizer: 2008 Ocean Sciences Meeting
  • Place of Presentation: Orange County Convention Center, Orlando, Florida, U.S.A
  • Year and Date: 2008-05-05
• [Presentation] Small-scaleeddies around the Kuril Straitsgenerated by barotropic tidal flow (2008)
  • Author(s): Nakamura, T., J. P. Matthews, T. Awaji, and H. Mitsudera
  • Organizer: 2008 Ocean Sciences Meeting
  • Place of Presentation: Orange County Convention Center, Orlando, Florida, U.S.A
  • Year and Date: 2008-05-04
• [Book] 第1章「東北アジア」の自然環境概説, 3.オホーツク海と海氷 : その特殊性と重要性,「朝倉世界地理講座-大地と人間-2巻 : 東北アジア」
  • Author(s): 大島慶一郎
  • Publisher: 朝倉書店(印刷中)