Iron transformation and transportation in the Pan-Okhotsk region

2009 Fiscal Year Final Research Report

• Project/Area Number: 19681001
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Environmental dynamic analysis
• Research Institution: Hokkaido University
• Principal Investigator: NISHIOKA Jun Hokkaido University, 低温科学研究所, 准教授 (90371533)
• Project Period (FY): 2007 – 2009
• Keywords: 鉄 / 環オホーツク / 中層循環 / 生物生産

Research Abstract

We found extremely high concentrations of dissolved and particulate iron in the Okhotsk Sea Intermediate Water (OSIW) and the North Pacific Intermediate Water (NPIW), which are affected by water ventilation processes caused by sea ice formation in the north-western continental shelf region of the Sea of Okhotsk. We can estimate the amount of diss-Fe in the intermediate layer. The Fe flux section cross the Oyashio is as 3.1×10^5~6.3×10^5μmol Fe/m^2/yr. The estimated annual upward flux is 28.6μmol Fe/m^2/yr in this region. Our data suggests that the consideration of this source of iron is essential in our understanding of the spring biological production and biogeochemical cycles in the western subarctic Pacific.

Research Products

• [Journal Article] Nutrient distribution in sea ice in the southern Sea of Okhotsk. (2010)
  • Author(s): Nomura, D., J., Nishioka, M.A. Granskog, A. Krell, S. Matoba, T. Toyota, H. Hattori, K. Shirasawa
  • Journal Title: Marine Chemistry 119(in press) Pages: 1-8
  • Peer Reviewed
• [Journal Article] Fe deficiency in micro-sized diatom in the Oyashio region of the western subarctic Pacific during spring (2010)
  • Author(s): Hattori, A., J., Nishioka, T. Ono, R.M.L. McKay, K. Suzuki
  • Journal Title: J. Oceanography 66 Pages: 105-115
  • Peer Reviewed
• [Journal Article] Changes in iron concentrations and bio-availability during an open ocean mesoscale iron enrichment experiment in the western subarctic pacific (2009)
  • Author(s): Nishioka, J., S. Takeda, Y. Kondo, H. Obata, T. Doi, D. Tsumune, C.S. Wong, W.K. Johnson, A. Tsuda
  • Journal Title: SEEDS II, Deep Sea Res. part II
  • URL: doi:10.1016/j.dsr2.2009.06.006
  • Peer Reviewed
• [Journal Article] Community structure and photosynthetic physiology of phytoplankton in the northwest subarctic pacific durng in situ iron fertilization experiment (SEEDS-II) (2009)
  • Author(s): Suzuki, K., H. Saito, T. Isada, A. Hattori-Saito, H. Kiyosawa, J. Nishioka, R.M.L. McKay, A. Kuwata, A. Tsuda
  • Journal Title: DeepSeaRes. partII
  • URL: doi:10.1016/j.dsr2.2009.06.001
  • Peer Reviewed
• [Journal Article] Increases of alkalinity and pH in the Okhotsk Sea during the 1990s and 2000s (2009)
  • Author(s): Watanabe, Y. W,, J., Nishioka, S., Shigemitsu, A., Mimura, T. Nakatsuka
  • Journal Title: Geophys. Res. Lett.
  • URL: doi:10.1029/2009GL038520
  • Peer Reviewed
• [Journal Article] Phytoplankton growth and microzooplankton grazing in the Sea of Okhotsk during late summer of 2006 (2009)
  • Author(s): Liu, H., K., Suzuki, J., Nishioka, R., Sohrin, T. Nakatsuka
  • Journal Title: Deep-Sea Research Part I 56(4) Pages: 561-570
  • URL: doi:10.1016/j.dsr.2008.12.003
  • Peer Reviewed
• [Journal Article] Size dependence of iron solubility of Asian mineral dust particles (2009)
  • Author(s): Ooki, A., J. Nishioka, T. Ono, S. Noriki
  • Journal Title: Journal of Geophysical Research 114 Pages: D03202
  • URL: doi:10.1029/2008JD010804
  • Peer Reviewed
• [Journal Article] 鉄の海洋内循環におけるコロイド態画分の重要性 (2009)
  • Author(s): 西岡純・武田重信
  • Journal Title: 月刊海洋 42 Pages: 14-19
• [Journal Article] 千島海峡の混合過程の生物地球化学的重要性-西部北太平洋亜寒帯域の鉄:栄養塩比に与える影響- (2008)
  • Author(s): 西岡純, 中塚武, 小野数, 他
  • Journal Title: 月刊海洋 50 Pages: 107-114
• [Journal Article] Evidence for the grazing hypothesis: grazing reduces phytoplankton responses of the HPLC ecosystem to iron enrichment in the western subarctic Pacific (SEED II). (2007)
  • Author(s): Tsuda, A., Takeda, S., Saito, H., Nishioka, J., et al
  • Journal Title: Journal of Oceanography 63 Pages: 983-994
  • Peer Reviewed
• [Journal Article] Iron input into the western subarctic Pacific, importance of iron export from the Sea of Okhotsk (2007)
  • Author(s): Nishioka, J., T. Ono, H. Saito, et al., T. Nakatsuka, S. Takeda, T. Yoshimura, K. Suzuki, K. Kuma, S. Nakabayashi, D. Tsumune, H. Mitsudera, W.K. Johnson, A. Tsuda
  • Journal Title: Journal of Geophysical Research 112 Pages: C10012
  • URL: doi:10.1029/2006JC004055
  • Peer Reviewed
• [Presentation] 大陸棚起源粒子態鉄の生物利用 (2010)
  • Author(s): 金浜幸治、西岡純
  • Organizer: 2010年度日本海洋学会春季大
  • Place of Presentation: 東京海洋大学、品川
  • Year and Date: 2010-03-29
• [Presentation] 千島海峡の混合過程が西部北太平洋亜寒帯域の鉄:栄養塩比に与える影響 (2009)
  • Author(s): 西岡純、中塚武
  • Organizer: 2009年度日本海洋学会春季大会
  • Place of Presentation: 東京大学、東京
  • Year and Date: 2009-04-06
• [Presentation] The importance of sea-ice formation in the Sea of Okhotsk for supplying iron to the western subarctic pacific (2009)
  • Author(s): Jun NISHIOKA, Takeshi Nakatsuka, Kenshi Kuma Yutaka W. Watanabe, Tsuneo Ono, Kay I. Ohshima, N. Ebuch
  • Organizer: 2009 ASLO aquatic science meeting
  • Place of Presentation: Nice France
  • Year and Date: 2009-01-24
• [Presentation] The importance of sea-ice formation in the Sea of Okhotsk for supplying iron to the western subarctic pacific (2008)
  • Author(s): Jun NISHIOKA, Takeshi Nakatsuka, Hiroaki Saito, Tsuneo Ono, Takayuki Shiraiwa
  • Organizer: 2008IMBER/IMBIZO workshop
  • Place of Presentation: Maiami, USA
  • Year and Date: 2008-11-09
• [Presentation] The importance of sea-ice formation in the Sea of Okhotsk for supplying iron to the western subarctic pacific (2008)
  • Author(s): Jun NISHIOKA, Takeshi Nakatsuka, Kenshi Kuma Yutaka W. Watanabe, Tsuneo Ono, Kay I. Ohshima
  • Organizer: 2008 PICES annual meeting
  • Place of Presentation: Dalian, China
  • Year and Date: 2008-10-25
• [Presentation] 親潮域表層における微量栄養物質(鉄)の広域水平分布自動観測 (2008)
  • Author(s): 西岡純・小埜恒夫・紀本英志・中村知裕・坂岡桂一郎
  • Organizer: 2008年度日本海洋学会秋季大会
  • Place of Presentation: 広島国際大学、広島
  • Year and Date: 2008-09-26
• [Presentation] Importance of lateral iron transportation from the Sea of Okhotsk to western subarctic Pacific (2008)
  • Author(s): Jun NISHIOKA, Kenshi KUMA, Yutaka W. WATANABE, Tsuneo ONO, Takeshi NAKATSUKA
  • Organizer: 2008 AOGS meeting
  • Place of Presentation: Busan, Koria
  • Year and Date: 2008-06-24
• [Presentation] 西部オホーツク海における鉄の供給と移送 (2008)
  • Author(s): 西岡純、久万健志、真鍋絵理、渡辺W豊、小野和也、坂岡桂一郎、中塚武
  • Organizer: 2008年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大、東京
  • Year and Date: 2008-03-27
• [Presentation] Iron supply to the western subarctic Pacific: Importance of iron export from the Sea of Okhotsk (2008)
  • Author(s): Jun Nishioka, Tsuneo Ono, Hiroaki Saito, Takeshi Nakatsuka, Shigenobu Takeda, Takeshi Yoshimura, Koji Suzuki, Kenshi Kuma, Shigeto Nakabayashi, Daisuke Tsumune, Humio Mitsudera, W. Keith Johnson, Atsushi Tsuda
  • Organizer: Ocean Sciences Meeting
  • Place of Presentation: Orlando USA
  • Year and Date: 2008-03-08
• [Presentation] Seasonal variability of iron concentration in the Oyashio region (2007)
  • Author(s): J. Nishioka, T. Ono, H. Saito
  • Organizer: 2007 PICES annual meeting
  • Place of Presentation: Victoria Canada
  • Year and Date: 2007-10-24
• [Presentation] 北太平洋中層水による鉄の移送 (2007)
  • Author(s): 西岡純、津旨大輔、中塚武、三寺史夫、津田淳
  • Organizer: 2007年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大、東京
  • Year and Date: 2007-03-25