Reconstruction of long-term oceanic pH variability since the Industrial Revolution from chemical composition in corals around Ryukyu Islands

• Project/Area Number: 23740385
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Stratigraphy/Paleontology
• Research Institution: University of the Ryukyus
• Principal Investigator: ASAMI Ryuji 琉球大学, 理学部, 助教 (00400242)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: サンゴ / 骨格年輪 / 古環境 / 古海洋 / 化学組成 / 温暖化 / 海洋酸性化 / 年輪 / 同位体組成 / 気候変動

Research Abstract

Massive Porites corals from Ryukyu Islands and Guam Island were investigated to analyze long-term trend and variability of ocean environment in the northwestern Pacific Ocean. Analysis of X-ray images showed that the coral cores collected at Okinoerabu-jima, Ryukyu Islands, have continuous annual skeletal density bands for the last 450 years (A.D. 1560-2011). Stable isotope and trace element analyses of the coral skeleton generated high-resolution time series of ocean environment parameters such as seawater temperature, salinity, pH, etc, over the long term. Climate reconstruction using the proxy data suggests that sea surface waters in the tropical and subtropical northwestern Pacific Ocean possibly have become warmer, fresher, and more acid since the mid-20th century.

Research Products

• [Journal Article] Differences in oxygen and carbon stable isotope ratios between hatchery and wild pink salmon fry (2014)
  • Author(s): Y. Tomida, T. Suzuki, T. Yamada, Ryuji ASAMI, H. Yaegashi, Y. Iryu, and T. Otake
  • Journal Title: Fisheries Science Volume: 80 Issue: 2 Pages: 273-280
  • DOI: 10.1007/s12562-014-0699-9
  • Peer Reviewed
• [Journal Article] Ocean acidification trend in the tropical North Pacific since the mid-20th century reconstructed from a coral archive (2013)
  • Author(s): R. Shinjo, Ryuji ASAMI, K. -F. Huang, C. F. You, and Y. Iryu
  • Journal Title: Marine Geology Volume: 342 Pages: 58-64
  • DOI: 10.1016/j.margeo.2013.06.002
  • Peer Reviewed
• [Journal Article] MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral (2013)
  • Author(s): Ryuji Asami, Yasufumi Iryu, Kimio Hanawa, Takashi Miwa, Peter Holden, Ryuichi Shinjo and Gustav Paulay
  • Journal Title: Quaternary Research Volume: 80巻 Issue: 3 Pages: 575-585
  • DOI: 10.1016/j.yqres.2013.09.002
  • Peer Reviewed
• [Journal Article] Inter-laboratory study for coral Sr/Ca and other element/Ca ratio measurements (2013)
  • Author(s): Ed C. Hathorne, Alex Gagnon, Thomas Felis, Jess Adkins, Ryuji ASAMI, Wim Boer, Nicolas Caillon, David Case, Kim M. Cobb, Eric Douville, Peter deMenocal, Anton Eisenhauer, C. -Dieter Garbe-Sch6nberg, Walter Geibert, Steven Goldstein, Konrad Hughen, Mayuri Inoue, Hodaka Kawahata, Martin K611ing, Florence Le Cornec, Braddock K. Linsley, Helen V. McGregor, Paolo Montagna, Terrence M. Quinn, Jacek Raddatz, Laura Robinson, Aleksey Sadekov, Rob Sherrell, Dan Sinclair, Alexander W. Tudhope, Gangjian Wei, Henri Wong, Henry C. Wu, Chen-Feng You
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 14 Issue: 9 Pages: 3730-3750
  • DOI: 10.1002/ggge.20230
• [Journal Article] Intraspecific variations in carbon- and oxygen-isotope compositions of a brachiopod Basiliola lucida collected off Okinawa-jima, southwestern Japan (2013)
  • Author(s): H. Takayanagi, Ryuji ASAMI, O. Abe, T. Miyajima, H. Kitagawa, K. Sasaki, and Y. Iryu
  • Journal Title: Geochimica et Cosmochimica Acta Volume: in press Pages: 115-136
  • DOI: 10.1016/j.gca.2013.03.026
  • Peer Reviewed
• [Journal Article] Correlative relationships between carbon- and oxygen-isotope records in two temperate brachiopod species off Otsuchi Bay, northeastern Japan (2013)
  • Author(s): K. Yamamoto, Ryuji ASAMI, and Y. Iryu
  • Journal Title: Paleontological Research Volume: 17 Issue: 1 Pages: 12-26
  • DOI: 10.2517/1342-8144-17.1.12
  • Peer Reviewed
• [Journal Article] Factors controlling isotopic composition of precipitation on Okinawa Island, Japan: Implications for paleoclimate reconstruction in the East Asian Monsoon region (2012)
  • Author(s): Ryu Uemura
  • Journal Title: Journal of Hydrology Volume: 475 Pages: 314-322
  • DOI: 10.1016/j.jhydrol.2012.10.014
  • Peer Reviewed
• [Journal Article] Pronounced interannual variability in tropical South Pacific tenlperatures during Heinrich stadial 1 (2012)
  • Author(s): T. Felis, U. Merkel, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, E. Bard, G. Cabioch, N. Durand, M. Prange, M. Schulz, S. Y. Cahyarini, and M. Pfeiffer
  • Journal Title: Nature Communication Volume: 3 Pages: 965-965
• [Journal Article] Pronounced interannual variability in tropical South Pacific temperatures during Heinrich stadial 1 (2012)
  • Author(s): T. Felis, U. Merkel, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, E. Bard, G. Cabioch, N. Durand, M. Prange, M. Schulz, S. Y. Cahyarini, and M. Pfeiffer
  • Journal Title: Nature Communication Volume: 3 Issue: 1
  • DOI: 10.1038/ncomms1973
  • Peer Reviewed
• [Journal Article] Carbon- and oxygen-isotope compositions of a deep-water modern brachiopod Campagea japonica collected off Aguni-jima, Central Ryukyu Islands, southwestern Japan (2012)
  • Author(s): H. Takayanagi, Ryuji ASAMI, Osamu Abe, Hiroyuki Kitagawa, Toshihiro Miyajima, and Y. Iryu
  • Journal Title: Geochemical Journal Volume: 46 Pages: 77-87
  • Peer Reviewed
• [Journal Article] Seawater temperature proxies based on D.Sr,D.Mg, and D.U from culture experiments using the branching coral Porites cylindrica (2011)
  • Author(s): Armid, A., 他8名
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 75 Issue: 15 Pages: 4273-4285
  • DOI: 10.1016/j.gca.2011.05.010
  • Peer Reviewed
• [Journal Article] Sources of plutonium to the tropical northwest Pacific Ocean (1943-1999) identified using a natural coral archive (2011)
  • Author(s): P. Lindahl, Ryuji ASAMI, Y. Iryu, P. Worsfold, M. Keith-Roach, and M. -S. Choi
  • Journal Title: Geochimica Cosmochimica Acta Volume: 75 Issue: 5 Pages: 1346-1356
  • DOI: 10.1016/j.gca.2010.12.012
• [Journal Article] Brachiopod taxa and shell portions reliably recording past ocean environments : Toward establishing a robust paleoceanographic proxy (2011)
  • Author(s): Yamamoto, K., Asami, R. and Iryu, Y.
  • Journal Title: Geophysical Research Letters Volume: Vol.38 Issue: 13 Pages: 13601-13601
  • DOI: 10.1029/2011gl047134
  • Peer Reviewed
• [Presentation] 琉球列島沖永良部島のサンゴ骨格の長期記録 (2014)
  • Author(s): 浅海竜司, 玉城昭太, 土屋真衣香, 川上紗弥,村山雅史, 井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
• [Presentation] サンゴのホウ素同位体組成から復元された20世紀半ば以降の北西太平洋熱帯域の pH 変動 (2014)
  • Author(s): 新城竜一, 浅海竜司, K. -F. Huang, C. -F. You, 井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
• [Presentation] Malcolm McCulloch : δ^<11>B, Sr, Mg and Ba in Acropora digitifera cultured under high-pCO_2 seawater : Effects of seawater pH on trace elenlent incorporation into coral aragonites (2014)
  • Author(s): Kentaro Tanaka, Asami Takahashi, Michael Holcomb, Haruko Kurihara, Ryuji ASAMI, Ryuichi Shinjo, Kohki Sowa, Tsuyoshi Watanabe
  • Organizer: International Joint Workshop on Coral reef environnlental earth sciences
  • Place of Presentation: Sapporo, Japan
• [Presentation] ヒレナシジャコの殻の酸素同位体組成を用いた海水温復元の信頼性 (2014)
  • Author(s): 山梨純平・高柳栄子・伊佐地彩加・浅海竜司・井龍康文
  • Organizer: 日本古生物学会
  • Place of Presentation: 兵庫県立人と自然博物館（兵庫県）
• [Presentation] δ11B, Sr, Mg and Ba in Acropora digitifera cultured under high-pCO2 seawater: Effects of seawater pH on trace element incorporation into coral aragonites (2014)
  • Author(s): K. Tanaka, A. Takahashi, M. Holcomb, H. Kurihara, R. Asami, R. Shinjo, K. Sowa, T. Watanabe, M. McCulloch
  • Organizer: International Joint Workshop on Coral reef environmental earth sciences
  • Place of Presentation: Sapporo, Japan
• [Presentation] Ocean acidification in the tropical Northwest Pacific since the mid-20th century reconstructed from coral boron isotope (2014)
  • Author(s): R. Shinjo, Ryuji ASAMI, K.-F. Huang, C. F. You, and Y. Iryu
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: パシフィコ横浜（神奈川県）
• [Presentation] 沖縄本島の遺跡から出土したシャコガイ殻化石によるサンゴ礁環境解析 (2014)
  • Author(s): 浅海竜司・小西美香・田中健太郎・植村 立・古川雅英・新城竜一
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: パシフィコ横浜（神奈川県）
• [Presentation] 分光式質量分析計による石筍中の流体包有物の水の同位体組成測定法の開発 (2014)
  • Author(s): 植村 立・仲本壮志・ 儀保雅一・三嶋 悟・浅海竜司
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: パシフィコ横浜（神奈川県）
• [Presentation] 琉球列島沖永良部島のサンゴ骨格の長期記録 (2014)
  • Author(s): 浅海竜司・玉城昭太・土屋真衣香・川上紗弥・村山雅史・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: パシフィコ横浜（神奈川県）
• [Presentation] 石垣島の現生サンゴから得られた過去500年間の骨格年輪記録 (2013)
  • Author(s): 浅海竜司・阿部 理・高柳栄子・平井 彰・森本真紀・井龍康文
  • Organizer: 日本海洋学会
  • Place of Presentation: 東京海洋大学
• [Presentation] サンゴ礁海域の環境・生態系変動の記録媒体としての潮上帯堆積物コアの有用性の検討 (2013)
  • Author(s): 藤田和彦・森 愛・浅海竜司・本郷宙軌
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] Cavity ring down spectroscopy for the isotope composition measurement of water from fluid inclusion in stalagmites using heating and crushing techniques (2013)
  • Author(s): M. Nakamoto, R. Uemura, M. Gibo, S. Mishima, and Ryuji ASAMI
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
• [Presentation] 沖縄島の遺跡から出土したシャコガイ殻化石の環境解析 (2013)
  • Author(s): 浅海竜司・小西美香・田中健太郎・植村 立・古川雅英・新城竜一
  • Organizer: 日本サンゴ礁学会
  • Place of Presentation: 沖縄科学技術大学院大学（沖縄県）
• [Presentation] サンゴ骨格中のフッ素含量と石灰化母液の炭酸イオン濃度の関係 (2012)
  • Author(s): 田中健太郎・浅海竜司・高橋麻美・栗原晴子・新城竜一
  • Organizer: 日本サンゴ礁学会
  • Place of Presentation: 東京大学
• [Presentation] サンゴを用いた海洋環境の長期変動解析 (2012)
  • Author(s): 浅海竜司
  • Organizer: 日本古生物学会年会・総会
  • Place of Presentation: 名古屋大学
  • Invited
• [Presentation] Oxygen and hydrogen isotope measurements of water from fluid inclusions in stalagmites using cavity ring-down spectroscopy (2012)
  • Author(s): R. Uemura, M. Nakamoto, M. Gibo, and Ryuji ASAMI
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
• [Presentation] An absolute-dated Indian summer monsoon record over the past 16 kyrs from Thamklang Cave, Thailand (2012)
  • Author(s): H.-C. Wang, C.-C. Shen, C. Sakonvan, L. Ludvig W. Barbara, X.-Y. Jiang, H.-C. Li, Ryuji ASAMI, and R. Uemura
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
• [Presentation] サンゴ骨格中のフッ素含量と石灰化母液の炭酸イオン濃度の関係 (2012)
  • Author(s): 田中健太郎・浅海竜司・高橋麻美・栗原晴子・新城竜一
  • Organizer: 日本サンゴ礁学会
  • Place of Presentation: 東京大学，東京
• [Presentation] 腕足動物ー古海洋環境復元に使える部分，使えない部分 (2012)
  • Author(s): 高柳栄子・山本剛志・浅海竜司・大竹二雄・宮島利宏・阿部 理・井龍康文
  • Organizer: 東京大学大気海洋研究所共同利用研究集会
  • Place of Presentation: 東京大学，柏
• [Presentation] Penultimate glacial tropical Pacific sea surface temperatures from Tahiti corals (2012)
  • Author(s): Ryuji ASAMI, T. Felis, P. Deschamps, A. Thomas, E. Bard, N. Durand, M. Murayama, Y. Iryu
  • Organizer: 12th International Coral Reef Symposium
  • Place of Presentation: Cairns, Australia
• [Presentation] Last deglacial tropical Pacific sea surface temperatures from Tahiti corals (2012)
  • Author(s): T. Felis, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, N. Durand, G. Cabioch, and E. Bard
  • Organizer: 12th International Coral Reef Symposium
  • Place of Presentation: Cairns, Australia
• [Presentation] High-resolution analysis of daily growth bands in giant clams (2012)
  • Author(s): A. Isaji, Ryuji ASAMI, H. Takayanagi, and Y. Iryu
  • Organizer: 12th International Coral Reef Symposium
  • Place of Presentation: Cairns, Australia
• [Presentation] サンゴを用いた海洋環境の長期変動解析 (2012)
  • Author(s): 浅海竜司
  • Organizer: 日本古生物学会年会・総会
  • Place of Presentation: 名古屋大学，名古屋
  • Invited
• [Presentation] Carbon- and oxygen-isotope compositions of a modern brachiopod collected from east coast of Sokcho, Korea (2012)
  • Author(s): 高柳栄子・W.-S. Woo・浅海竜司・J.-J. Park・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ，千葉
• [Presentation] サンゴ骨格中のプルトニウムの起源 (2011)
  • Author(s): P. Lindahl・浅海竜司・井龍康文・P. Worsfold・M. Keith-Roach・C. Min-Seok
  • Organizer: 日本サンゴ礁学会第14回大会
  • Place of Presentation: 那覇
• [Presentation] 沖縄本島南部における降水同位体比の変動要因 (2011)
  • Author(s): 植村立・浅海竜司・嘉手納恒・山川周作・南舞依香・山田桂大・吉田尚弘
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
• [Presentation] サンゴのホウ素同位体組成から復元される北西太平洋熱帯表層の pH 変動 (2011)
  • Author(s): 新城竜一・浅海竜司・K.-F.Huang・C.-F. You・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
• [Presentation] Sources of plutonium to the tropical Northwest Pacific Ocean since the mid-20th centu「y : anatural coral archive (2011)
  • Author(s): P. Lindahl, Ryuji ASAMI, Y. Iryu, P. Worsfold, M. Keith-Roach, M.-S. Choi
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
• [Presentation] Three sets of temperature proxy revealed from coral Porites cylindrica (2011)
  • Author(s): A. Armid, Ryuji ASAMI, T. Fahmiati, M. A. Sheikh, H. Fujimura, T. Higuchi, E. Taira, R. Shinjo, T. Oomori
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
• [Presentation] Tropical South Pacific sea surface temperatures during the last deglaciation from Tahiti corals (2011)
  • Author(s): T. Felis, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, N. Durand, G. Cabioch, and E. Bard
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
• [Presentation] シャコガイの成長輪は何を記録しているのか (2011)
  • Author(s): 伊佐地彩加・浅海竜司・高柳栄子・井龍康文
  • Organizer: 日本サンゴ礁学会
  • Place of Presentation: てぃるる（沖縄県）
• [Presentation] サンゴ骨格中のプルトニウムの起源 (2011)
  • Author(s): P. Lindahl・浅海竜司・井龍康文・P. Worsfold・M. Keith-Roach・C. Min-Seok
  • Organizer: 日本サンゴ礁学会
  • Place of Presentation: てぃるる（沖縄県）
• [Presentation] Intraspecific Variations in Carbon and Oxygen Isotope Compositions of a Modern Brachiopod Collected off Okinawa-jima (2011)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部 理・北川浩之・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] Tropical South Pacific Climate Variability Inferred from Tahiti Fossil Corals: Results from IODP Expedition 310 -Tahiti Sea Level- (2011)
  • Author(s): Ryuji ASAMI, T. Felis, P. Deschamps, K. Hanawa, Y. Iryu, E. Bard, N. Durand, and M. Murayama
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] 沖縄本島南部における降水同位体比の変動要因 (2011)
  • Author(s): 植村立・浅海竜司・嘉手納恒・山川周作・南舞依香・山田桂大・吉田尚弘
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] 沖縄本島南部玉泉洞の石筍を用いた陸域古環境復元 (2011)
  • Author(s): 浅海竜司・植村 立・山川周作・南 舞依香・高柳栄子・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] サンゴのホウ素同位体組成から復元される北西太平洋熱帯表層のpH変動 (2011)
  • Author(s): 新城竜一・浅海竜司・K.-F. Huang・C.-F. You・井龍康文
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] Sources of plutonium to the tropical Northwest Pacific Ocean since the mid-20th century: a natural coral archive (2011)
  • Author(s): P. Lindahl, Ryuji ASAMI, Y. Iryu, P. Worsfold, M. Keith-Roach, M.-S. Choi
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] Three sets of temperature proxy revealed from coral Porites cylindrica (2011)
  • Author(s): A. Armid, Ryuji ASAMI, T. Fahmiati, M. A. Sheikh, H. Fujimura, T. Higuchi, E. Taira, R. Shinjo, T. Oomori
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ（千葉県）
• [Presentation] Pronounced interannual variability in tropical South Pacific temperatures during Heinrich stadial 1 (2011)
  • Author(s): T. Felis, U. Merkel, Ryuji ASAMI, P. Deschamps, E. C. Hathorne, M. Kolling, E. Bard, G. Cabioch, N. Durand, M. Prange, M. Schulz, S. Y. Cahyarini, and M. Pfeiffer
  • Organizer: European Geophysical Union Assembly
  • Place of Presentation: Vienna, Austria