Sedimentation switch of diatoms for new understandings in ocean chemistry

• Project/Area Number: 23310008
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Kyushu University
• Principal Investigator: AKAGI Tasuku 九州大学, 理学(系)研究科(研究院), 教授 (80184076)
• Co-Investigator(Kenkyū-buntansha): TAKAHASHI Kozo 北星学園大学, 社会福祉学部, 教授 (30244875) ; SANO Hiroyoshi 九州大学, 大学院・理学研究院, 教授 (80136423)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: ケイ藻 / 珪酸殻 / デジタルアクション / 希土類元素 / 炭素同位体比 / 生物ポンプ / 海洋ケイ酸 / ケイ酸金属錯体 / ケイ藻珪酸殻 / 有機炭素 / ケイ藻ケイ酸殻 / 沈降粒子 / 溶解速度論 / 溶解 / 層状チャート

Research Abstract

Diatom frustules tend to retain their chemical information when they form mega-aggregates. Using this property the chemical entity of diatom frustulea and chemical species of dissolved rare earth elements (REEs) in seawater are identified.
1.Difference in individual frustule specimens was too great to allow clear discussion on dissolution kinetics./2.Diatom frustules contain terrigenous elements at concentrations of 1/100-1/10 that of terrigenous matter./3.A majority of REEs dissolve as silicic acid complexes in seawater and diatoms can absorb them to incorporate into frustules./4.Diatoms digest terrigenous silicates to incorporate into frustules./5.Most of organic matter in diatom frustules is readily decomposed during settlement and only less than 2% of it remains even when diatomaceous productivity is extremely high.

Research Products

• [Journal Article] Diatoms spread a high ε_Nd-signature in the North Pacific Ocean (2014)
  • Author(s): Akagi, T., Yasuda, S., Asahara, Y., Emoto, M. & Takahashi, K.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 48 Issue: 2 Pages: 121-131
  • DOI: 10.2343/geochemj.2.0292
  • NAID: 130004469405
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed
• [Journal Article] Alkaline leaching characteristics of biogenic opal in the Eocene sedim ents from the central Arctic Ocean : A case study in the ACEX cores (2014)
  • Author(s): Shinya Iwasaki, Kozo Takahashi, Yusuke Ogawa, Seiichiro Uehara, Christoph Vogt
  • Journal Title: Journal of Oceanography Volume: 70 Issue: 3 Pages: 241-249
  • DOI: 10.1007/s10872-014-0227-7
  • Peer Reviewed
• [Journal Article] Erratum to (2013)
  • Author(s): Akagi, T.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 123 Pages: 459-459
  • DOI: 10.1016/j.gca.2013.06.030
• [Journal Article] Revision of the dissolution kinetics of aggregated settling particles (2013)
  • Author(s): Akagi, T.
  • Journal Title: Mem. Fac. Sci. Kyushu Univ. Ser. D Earth & Planet. Sci Volume: 33 Pages: 1-5
  • NAID: 120005371981
  • URL: http://catalog.lib.kyushu-u.ac.jp/handle/2324/1397628/p001.pdf
  • Peer Reviewed
• [Journal Article] Rare earth element (REE)-silicic acid complexes in seawater to explain the incorporation of REEs in opal and the "leftover" REEs in surface water : New interpretation of dissolved REE distribution profiles (2013)
  • Author(s): Akagi, T.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 113 Pages: 174-192
  • Peer Reviewed
• [Journal Article] Rare earth element (REE)-silicic acid complexes in seawater to explain the incorporation of REEs in opal and the “leftover” REEs in surface water: new interpretation of dissolved REE distribution profiles (2013)
  • Author(s): Tasuku Akagi
  • Journal Title: Geochimica. Cosmochim. Acta Volume: 113 Pages: 174-192
  • DOI: 10.1016/j.gca.2013.03.014
  • Peer Reviewed
• [Journal Article] Revision of the dissolution kinetics of aggregated settling particles. (2013)
  • Author(s): Akagi, T.
  • Journal Title: Mem. Fac. Sci. Kyushu Univ. Ser. D. Earth & Planet. Sci. Volume: 33 Pages: 1-5
  • NAID: 120005371981
  • Peer Reviewed
• [Journal Article] Dissolved ion analyses of stream water from bamboo forests : Implication for enhancement of chemical weathering by bamboo (2012)
  • Author(s): Akagi, T. et al
  • Journal Title: Geochemical Journal Volume: 46 Pages: 505-515
  • NAID: 10031146302
  • URL: http://svr4.terrapub.co.jp/journals/GJ/pdf/4606/46060505.pdf
  • Peer Reviewed
• [Journal Article] Dissolved ion analyses of stream water from bamboo forests: Implication for enhancement of chemical weathering by bamboo (2012)
  • Author(s): T. Akagi
  • Journal Title: Geochemical Journal Volume: 46 Pages: 505-515
  • NAID: 10031146302
  • Peer Reviewed
• [Journal Article] Museum archives of the 19 years long time-series sediment trap samples collected at central subarctic Pacific Station SA and Bering Sea Station AB during 1990-2010. (2012)
  • Author(s): Takahashi, K.
  • Journal Title: Memoirs of the Faculty of Sciences, Kyushu University, Series D, Earth and Planetary Sciences Volume: 32 Pages: 1-38
  • NAID: 120003837079
  • Peer Reviewed
• [Journal Article] Late Permian to Early Triassic environmental changes in the Panthalassic Ocean: Record from the seamount-associated deep-marine siliceous rocks, central Japan. (2012)
  • Author(s): Sano, H.
  • Journal Title: Palaeogeography, Palaeoclimatology, Palaeoecology Volume: 363-364 Pages: 1-10
  • Peer Reviewed
• [Journal Article] Stratigraphy and age of the Permian-Triassic boundary siliceous rocks of the Mino terrane in the Mt. Funabuseyama area, central Japan. (2012)
  • Author(s): Sano, H.
  • Journal Title: Paleontological Research Volume: 16 Pages: 124-145
  • NAID: 10030498693
  • Peer Reviewed
• [Journal Article] Composition of rare earth elements in settling particles collected in the highly productive North Pacific Ocean and Bering Sea : Implications for siliceous-matter dissolution kinetics and formation of two REE-enriched phases (2011)
  • Author(s): Akagi, Tasuku; Fu, Feng-Fu; Hongo, Yayoi; Takahashi, Kozo
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 75 Issue: 17 Pages: 4857-4876
  • DOI: 10.1016/j.gca.2011.06.001
  • Peer Reviewed
• [Presentation] 海洋における有機炭素輸送 珪藻と炭酸殻プランクトンの役割 (2013)
  • Author(s): 安田 早希, 原 由利子, 高橋 孝三, 赤木 右
  • Organizer: 第3回同位体環境学シンポジウム
  • Place of Presentation: 京都
  • Year and Date: 2013-12-17
• [Presentation] ケイ藻のデジタルアクション VI : ケイ藻オパール中元素濃度のボックスモデルによる解析 (2013)
  • Author(s): 江本真理子, 赤木 右, 高橋 孝三
  • Organizer: 2013年度 日本地球化学会年会
  • Place of Presentation: つくば
  • Year and Date: 2013-09-13
• [Presentation] 珪藻のデジタルアクションV太平洋の高いεNdは珪藻に由来する (2013)
  • Author(s): 赤木 右, 安田早希, 浅原良浩, 江本真理子, 高橋孝三
  • Organizer: 2013年度 日本地球化学会年会
  • Place of Presentation: つくば
  • Year and Date: 2013-09-13
• [Presentation] 100% decomposition of diatomous organic carbon during settlement (2013)
  • Author(s): S. Yasuda, Y. Hara, K. Takahashi, T. Akagi
  • Organizer: Goldschmidt2013
  • Place of Presentation: Florence, Italy
  • Year and Date: 2013-08-28
• [Presentation] 未変質ケイ藻オパールの化学組成の決定と海洋元素循環への影響 (2013)
  • Author(s): 江本真理子, 赤木 右, 高橋 孝三
  • Organizer: 日本地球惑星科学連合 2013年大会
  • Place of Presentation: 幕張
  • Year and Date: 2013-05-24
• [Presentation] Intake of REE-silicic acid complexes by diatoms changes the REE geochemical cycle (2013)
  • Author(s): Tasuku Akagi
  • Organizer: Seminar on Frontiers of REE geochemistry
  • Place of Presentation: 東京 田町
  • Year and Date: 2013-03-16
• [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: 東京
• [Presentation] ケイ藻生物ポンプのデジタルアクションIV溶解速度論を応用した未変質ケイ藻オパールの化学組成 (2012)
  • Author(s): 江本真理子, 赤木右, 高橋孝三
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
  • Year and Date: 2012-09-13
• [Presentation] ケイ藻生物ポンプのデジタルアクションIIケイ酸塩錯体のケイ藻による選択的取り込みが海洋表層の希土類元素濃度を決める (2012)
  • Author(s): 赤木右
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
  • Year and Date: 2012-09-13
• [Presentation] ケイ藻生物ポンプのデジタルアクションIII珪藻殻包有有機炭素量の測定および沈降有機炭素の同位体的特徴 (2012)
  • Author(s): 安田早希, 原由利子, 赤木右, 高橋孝三
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
  • Year and Date: 2012-09-11
• [Presentation] Diatoms as an important carrier of trace elements in the oceans (2012)
  • Author(s): Tasuku Akagi
  • Organizer: Department Symposium, Earth Sciences
  • Place of Presentation: Gothenberg University, Sweden
  • Year and Date: 2012-05-24
• [Presentation] ケイ藻生物ポンプのデジタルアクションII ケイ酸塩錯体のケイ藻による選択的取り込みが海洋表層の希土類元素濃度を決める (2012)
  • Author(s): 赤木 右
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
• [Presentation] ケイ藻生物ポンプのデジタルアクションIII 珪藻殻包有有機炭素量の測定および沈降有機炭素の同位体的特徴 (2012)
  • Author(s): 安田早希、原由利子、赤木右、 高橋孝三
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
• [Presentation] ケイ藻生物ポンプのデジタルアクションIV 溶解速度論を応用した未変質ケイ藻オパールの化学組成 (2012)
  • Author(s): 江本真理子、赤木右、高橋孝三
  • Organizer: 2012年度日本地球化学会第59回年会
  • Place of Presentation: 福岡
• [Presentation] パンサラッサ海起源のペルム紀・三畳紀境界遠洋性珪質岩層の岩相・化石層序の比較 (2012)
  • Author(s): 佐野弘好・桑原希世子・八尾 昭・上松佐知子
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪
• [Presentation] 電子顕微鏡観察による珪藻オパールの変質の速度論 (2011)
  • Author(s): 江本真理子・赤木右・高橋孝三
  • Organizer: 2011年度日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-16
• [Presentation] 大気中二酸化炭素濃度変動に対するミズゴケの応答を調査する栽培装置の開発 (2011)
  • Author(s): 安田早希・高田理恵・大木誠吾・赤木右
  • Organizer: 日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-16
• [Presentation] 電子顕微鏡観察による珪藻オパールの変質の速度論 (2011)
  • Author(s): 江本真理子・赤木右・高橋孝三
  • Organizer: 日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-16
• [Presentation] 植物体中の希土類元素から推定する無機元素の起源および分別 (2011)
  • Author(s): 高田理恵・赤木右・三浦智洋
  • Organizer: 日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-16
• [Presentation] ミズゴケに保持された水の同位体的特徴 (2011)
  • Author(s): 大木誠吾、陣野宏宙、赤木右、Lars Franzen
  • Organizer: 日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-16
• [Presentation] 珪藻生物ポンプのデジタルアクション I珪藻オパール中の元素濃度の求め方 (2011)
  • Author(s): 赤木右
  • Organizer: 2011年度日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-15
• [Presentation] 珪藻生物ポンプのデジタルアクションI珪藻オパール中の元素濃度の求め方 (2011)
  • Author(s): 赤木右
  • Organizer: 日本地球化学会
  • Place of Presentation: 札幌
  • Year and Date: 2011-09-15
• [Presentation] Reconstruction of the climatic information of the Holocene using peat cores of Sphagnum in both hemispheres (2011)
  • Author(s): Seigo Ooki, Tasuku Akagi
  • Organizer: The 1st International Congress on Natural Sciences with Sisterhood Universities, Korea
  • Place of Presentation: Busan(韓国)
  • Year and Date: 2011-08-25
• [Presentation] 植物によるケイ酸塩鉱物中の希土類元素の取り込みと共生菌根菌 (2011)
  • Author(s): 高田理恵・赤木右・三浦智洋
  • Organizer: 地球惑星連合大会
  • Place of Presentation: 幕張
  • Year and Date: 2011-05-22
• [Presentation] 未変質ケイ藻オパールの化学組成の決定と海洋元素循環への影響
  • Author(s): 江本真理子, 赤木 右, 高橋 孝三
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 幕張
• [Presentation] ケイ藻のデジタルアクションVI：ケイ藻オパール中元素濃度のボックスモデルによる解析
  • Author(s): 江本真理子, 赤木 右, 高橋 孝三
  • Organizer: 2013年度 日本地球化学会年会
  • Place of Presentation: つくば
• [Presentation] 珪藻のデジタルアクションV 太平洋の高いεNdは珪藻に由来する
  • Author(s): 赤木 右, 安田早希, 浅原良浩, 江本真理子, 高橋孝三
  • Organizer: 2013年度 日本地球化学会年会
  • Place of Presentation: つくば
• [Presentation] 海洋における有機炭素輸送 珪藻と炭酸殻プランクトンの役割
  • Author(s): 安田 早希, 原 由利子, 高橋 孝三, 赤木 右
  • Organizer: 第3回 同位体環境学シンポジウム
  • Place of Presentation: 京都
• [Book] DIATOMS DIVERSITY AND DISTRIBUTION, ROLE IN BIOTECHNOLOGY AND ENVIRONMENTAL IMPACTS 127 (2013)
  • Author(s): Akagi, T., Emoto, M., Tadkada, R. & Takahashi, K.
  • Total Pages: 127
  • Publisher: Nova Science Publishers, Inc., New York, USA
• [Book] Diatoms: Diversity and Distribution, Role in Biotechnology and Environmental Impacts. (2013)
  • Author(s): T. Akagi, M. Emoto, R. Takada and K. Takahashi
  • Total Pages: 127
  • Publisher: Nova Science Publishers
• [Book] ケイ酸 : その由来と行方 (2012)
  • Author(s): 赤木 右(分担)古米, 弘., 山本, 晃. & 佐藤, 和(編)
  • Total Pages: 181
  • Publisher: 技報堂出版
• [Book] 技報堂出版ケイ酸その由来と行方 (2011)
  • Author(s): 赤木右(分担)
  • Total Pages: 181
  • Publisher: ケイ酸その由来と行方技報堂出版