Study to investigate the Holocene Temperature Conundrum

• Project/Area Number: 23KK0013
• Research Category: Fund for the Promotion of Joint International Research (International Collaborative Research)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 4:Geography, cultural anthropology, folklore, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: 横山 祐典 東京大学, 大気海洋研究所, 教授 (10359648)
• Co-Investigator(Kenkyū-buntansha): 尾崎 和海 東京工業大学, 理学院, 准教授 (10644411) ; 平林 頌子 東京大学, 大気海洋研究所, 講師 (40835641) ; Obrochta Stephen 秋田大学, 国際資源学研究科, 教授 (60752540)
• Project Period (FY): 2023-09-08 – 2028-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000); Fiscal Year 2027: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2026: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2025: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2024: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 完新世 / 古気候 / 古海洋 / サンゴ / 同位体

Outline of Research at the Start

およそ6,000年前の縄文時代は温暖であったとされている(ヒプシサーマル)。しかし気候モデルで反対に寒冷だったとされている。現在より数℃温暖だったという前提のもとで縄文時代は近未来の気候アナログとして捉えられ、土地利用などについて議論が行われている。しかし気候モデルでは当時数℃寒かったとされ、完新世の気温復元不一致問題とよばれている。本研究では、この問題に取り組む。

Outline of Annual Research Achievements

オーストラリア側研究者であるシドニー大学のWebster教授が来日したのを機に、グレートバリアリーフと対になる場所に位置する南西諸島について、研究の計画立案を行った。またWebster教授との喜界島への現地調査のも含め、複数回のサンプリングと分析を行った。特に地下水の動態を探ることで気候変動との関係性を論じることができると考えて分析を実施し、成果を国際誌に発表しプレスリリースを行うとともに、地元紙にも掲載された。オーストラリアグレートバリアリーフの試料について、シドニー大学に保管されているものを選択し、シドニー大学側のスタッフの協力も得ながら完新世の分析に供することができる試料を選別し、それらを東大に移送した。年度後半にはWebster教授の共同研究者でもあり、サンゴ骨格を使った子気候復元研究の第一人者でもあるウーロンゴン大学のMcGregor教授や、オーストラリア国立大学のAbram教授と複数回の面談を行い、サンゴ骨格を使った化学分析手法の改良などについて議論を行うとともに、水温復元や塩分復元の再現性などについての意見交換を実施した。さらに、完新世の直前の最終氷期に氷河の存在が確認されているオーストラリアのグレートディバイデング山脈の氷河堆積物や湖の過去の水深変化についての観察等を行い、低緯度および海面付近の気温変化とより高緯度の高度の高い地点での気候変化などについて現地の研究者と議論を行った。またシドニー大学を訪問し、分析試料の測定計画について議論を行うことができた。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

当初予定していたよりも多くの複数回の議論を対面で実施したことや、オーストラリアに渡航して議論をした際に、より具体的に研究計画について検討を行うことができたため。

Strategy for Future Research Activity

更なる分析の検討を行うため、のべ4週間以上のオーストラリアへの渡航を計画している。特に氷期から間氷期つまり更新世の終わりから完新世への移行期を含んだ時期の気候感度を理解するために、氷床コアや気候モデルの研究者を含む多くの研究者との議論を行うことを計画している。さらに、それらの情報を他のメンバーとも共有すべく、オンラインでの検討会を計画していく。

Research Products

• [Journal Article] Reconstruction of Paleoenvironment and Identification of Historical Tsunami Deposits by Geochemical Analyses in Iwanuma City, Miyagi Prefecture, Japan (2023)
  • Author(s): OGATA Yusuke、GOTO Kazuhisa、SHINOZAKI Tetsuya、IKEHARA Minoru、CHAGUE Catherine、KAWAMATA Takao、YOKOYAMA Yusuke、MIYAIRI Yosuke、ISHIZAWA Takashi、TETSUKA Hiroshi
  • Journal Title: Journal of Geography (Chigaku Zasshi) Volume: 132 Issue: 4 Pages: 275-296
  • DOI: 10.5026/jgeography.132.275
  • ISSN: 0022-135X, 1884-0884
  • Year and Date: 2023-08-25
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A magnetic and geochemical approach to the changing sedimentation accumulation on the upper slope of the great barrier reef, northeastern Australian margin (2023)
  • Author(s): Hassan Muhammad Bin、Tagliaro Gabriel、Harper Brandon、Droxler Andr? W.、Herrero-Bervera Emilio、Yokoyama Yusuke、Puga-Bernab?u ?ngel、Webster Jody M.、Jovane Luigi
  • Journal Title: Quaternary Science Reviews Volume: 315 Pages: 108230-108230
  • DOI: 10.1016/j.quascirev.2023.108230
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Age offsets between radiocarbon samples and changes in Holocene depositional ocean environments captured in sediment cores near Ube City, Yamaguchi Prefecture, Japan (2023)
  • Author(s): Tam Evan、Yokoyama Yusuke、Miyashita Yukari、Miyairi Yosuke、Milne Glenn、Lloyd Sabrina
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 540 Pages: 67-73
  • DOI: 10.1016/j.nimb.2023.03.022
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sedimentological observations and geochemical characteristics of paleo-tsunami deposits along the east coast of Sri Lanka in the Indian Ocean (2023)
  • Author(s): Ratnayake A.S.、Wijewardhana T.D.U.、Haraguchi T.、Goto K.、Ratnayake N.P.、Tetsuka H.、Yokoyama Y.、Miyairi Y.、Attanayake A.M.A.N.B.
  • Journal Title: Quaternary International Volume: 661 Pages: 49-59
  • DOI: 10.1016/j.quaint.2023.02.015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Drilling 1100-km-long seafloor ridges reveals how palaeoshorelines control carbonate shelf morphologies (North West Shelf, Australia) (2023)
  • Author(s): Lebrec Ulysse、Riera Rosine、O'Leary Michael、Webster Jody M.、Yokoyama Yusuke、Gliganic Luke A.、Lang Simon C.、Paumard Victorien
  • Journal Title: Quaternary Science Reviews Volume: 312 Pages: 108164-108164
  • DOI: 10.1016/j.quascirev.2023.108164
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Newly designed glass apparatus to conduct stepwise dissolution experiment for radiocarbon using fish otoliths (2023)
  • Author(s): Miyairi Yosuke、Yokoyama Yusuke、Nagata Toshi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 539 Pages: 22-27
  • DOI: 10.1016/j.nimb.2023.02.031
  • Peer Reviewed / Open Access
• [Journal Article] An in situ cosmogenic 14C extraction system at the Atmosphere and Ocean Research Institute, The University of Tokyo (2023)
  • Author(s): Shimizu Yusuke、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 539 Pages: 190-196
  • DOI: 10.1016/j.nimb.2023.03.026
  • Peer Reviewed / Open Access
• [Journal Article] Eruptive history of Mt. Fuji over the past 8000 years based on integrated records of lacustrine and terrestrial tephra sequences and radiocarbon dating (2023)
  • Author(s): Yamamoto Shinya、Kametani Nobuko、Yoshimoto Mitsuhiro、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Quaternary Science Advances Volume: 12 Pages: 100091-100091
  • DOI: 10.1016/j.qsa.2023.100091
  • Peer Reviewed / Open Access
• [Journal Article] Reappraisal of lagoon specific local marine reservoir effects in Tongatapu, the Kingdom of Tonga, over the last 3000?years (2023)
  • Author(s): Fukuyo Naoto、Clark Geoffrey、Yokoyama Yusuke
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 538 Pages: 185-191
  • DOI: 10.1016/j.nimb.2023.02.027
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Testing the potential of Serpulidae tubes as an indicator of past relative sea-level collected from shored wave dissipating blocks along the Pacific and Japan sea coast of northeastern Japan (2023)
  • Author(s): Leggett Kai、Yokoyama Yusuke、Miyairi Yosuke、Ota Kosuke、Fukuyo Naoto、Shirahama Yoshiki
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 538 Pages: 58-63
  • DOI: 10.1016/j.nimb.2023.02.004
  • Peer Reviewed / Open Access
• [Journal Article] Monthly measurements of water dissolved inorganic radiocarbon in Lake Kawaguchi for three years indicating seasonal precipitation-groundwater variations (2023)
  • Author(s): Ota Kosuke、Yokoyama Yusuke、Miyairi Yosuke、Yamamoto Shinya、Wang Yunyi、Miyajima Toshihiro
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 538 Pages: 75-80
  • DOI: 10.1016/j.nimb.2023.02.021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 60 Years and Beyond of <i>Reviews of Geophysics (2023)
  • Author(s): Florindo Fabio、Acocella Valerio、Carlton Ann Marie、D’Odorico Paolo、Duan Qingyun、Gettelman Andrew、Halekas Jasper、Harris Ruth、Mollenhauer Gesine、Robock Alan、Stirling Claudine、Yokoyama Yusuke
  • Journal Title: Reviews of Geophysics Volume: 61 Issue: 2
  • DOI: 10.1029/2023rg000807
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The use of radiocarbon to evaluate the trophic role of geothermal bacteria in shallow hydrothermal water ecosystem (2023)
  • Author(s): Pascal Pierre-Yves、Nomaki Hidetaka、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Ecological Indicators Volume: 148 Pages: 110108-110108
  • DOI: 10.1016/j.ecolind.2023.110108
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Relationship between depositional environments and preservabilities of Holocene tsunami deposits on the Hidaka coast, Hokkaido, Japan (2023)
  • Author(s): Nakanishi Ryo、Ashi Juichiro、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Quaternary Science Advances Volume: 10 Pages: 100081-100081
  • DOI: 10.1016/j.qsa.2023.100081
  • Peer Reviewed / Open Access
• [Journal Article] Radiocarbon dating of wetland sediment from the Konsen Plateau, eastern Hokkaido, Japan (2023)
  • Author(s): Tsuneoka Ren、Yokoyama Yusuke、Sakashita Wataru、Ota Kosuke、Miyairi Yosuke、Kondo Reisuke、Yokochi Minoru、Kaneko Kazuhiro、Inoue Takashi、Kito Norio、Uemura Kyota、Sumita Mari、Momohara Arata、Fujita Hiroko
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 536 Pages: 67-71
  • DOI: 10.1016/j.nimb.2022.12.021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Discovery of Holocene ooid shoals in a siliciclastic delta, De Grey River, North West Shelf, Australia (2023)
  • Author(s): Lebrec Ulysse、Lang Simon C.、Paumard Victorien、O’Leary Michael J.、Yokoyama Yusuke、Hacker Jorg、Webster Jody
  • Journal Title: Geology Volume: 51 Issue: 4 Pages: 366-371
  • DOI: 10.1130/g50840.1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An initial attempt to date Pleistocene marine terraces in the south coast of Japan using in situ cosmogenic 10Be and 26Al (2023)
  • Author(s): Yusuke Yokoyama, Atsunori Nakamura, Gen Nagano, Hideki Maemoku, Yosuke Miyairi, Stephen Obrochta, Hiroyuki Matsuzaki
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 535 Pages: 255-260
  • DOI: 10.1016/j.nimb.2022.11.028
  • Peer Reviewed / Open Access
• [Journal Article] Dataset for the establishment of an age model of marine sediment core KH19-6 Leg.4 PC10/MC14 collected from the Agulhas Ridge in the South Atlantic Ocean (2023)
  • Author(s): Kubota Kaoru、Tanabe Rosaaideihn、Ikehara Minoru、Kozaka Yukiko、Seike Koji、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Data in Brief Volume: 46 Pages: 108797-108797
  • DOI: 10.1016/j.dib.2022.108797
  • Peer Reviewed / Open Access
• [Journal Article] First dataset of dissolved inorganic radiocarbon in the Tokara Strait (2023)
  • Author(s): Lan Hui、Hirabayashi Shoko、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 57 Issue: 6 Pages: 197-203
  • DOI: 10.2343/geochemj.GJ23018
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] HOLOCENE OVERWASH OCCURRENCE AGE IN THE ISUMI RIVER LOWLAND, EASTERN BOSO PENINSULA, JAPAN (2023)
  • Author(s): Oda Soichiro、Obrochta Stephen P、Fujiwara Osamu、Yokoyama Yusuke、Miyairi Yosuke、Hatakeyama Yoshiya
  • Journal Title: Radiocarbon Volume: null Issue: 5 Pages: 1-11
  • DOI: 10.1017/rdc.2023.105
  • Peer Reviewed / Open Access
• [Journal Article] Phylogenetic context of a deep-sea clam (Bivalvia: Vesicomyidae) revealed by DNA from 1 500-year-old shells (2023)
  • Author(s): Li Yi-Xuan、香港浸会大学生物系, 香港, 中国、Department of Biology, Hong Kong Baptist University, Hong Kong SAR, China、Zhang Yanjie、Chi-Ho Ip Jack、Liu Jing、Chen Chong、T.S. Little Crispin、Yokoyama Yusuke、et al.
  • Journal Title: Zoological Research Volume: 44 Issue: 2 Pages: 353-356
  • DOI: 10.24272/j.issn.2095-8137.2022.404
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] A 7,500-year-long record of extreme wave events from tidal Lake Hamana, south-central Japan (2023)
  • Author(s): Marc De Batist, Evelien Boes, Osamu Fujiwara, Yusuke Yokoyama, Yosuke Miyairi, Masanobu Shishikura, Philipp Kempf, Sabine Schmidt, Atsunori Nakamura, Svenja Riedesel, Helmut Brckner, Vanessa M.A. Heyvaert, and the the QuakeRecNankai team
  • Organizer: EGU General Assembly 2023
  • Int'l Joint Research
• [Presentation] Chuuan-Chou (River) Shen, Felicia Beardsley, Shou-Yeh Gong, Osamu Kataoka, Minoru Yoneda, Yusuke Yokoyama, Leilei Jiang, Albert Yu-Min Lin, James Fox, Jason Barnabas, Gus Kohler, Zoe T. Richards, and Jean-Paul A. Hobbs (2023)
  • Author(s): Dating a world-unique Pacific ruin: Nan Madol
  • Organizer: EGU General Assembly 2023
  • Int'l Joint Research
• [Presentation] 岩手県侍浜の海成段丘における表面照射年代測定に基づく離水年代 (2023)
  • Author(s): レゲット 佳, 横山 祐典, 宮入 陽介, 白濱 吉起, 阿部 恒平, 照沢 秀司
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Dissolved inorganic radiocarbon as a sensitive tracer for tracking water masses in the upper ocean of the Kuroshio Large Meander Region (2023)
  • Author(s): 蘭慧, 横山祐典, 平林頌子, 宮入陽介, 江思宇, 齊藤宏明, 羽角博康, 安田一郎
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Reassessment of Lagoon-Specific Marine Reservoir Effects in Tongatapu, Kingdom of Tonga, over the Past 3000 Years (2023)
  • Author(s): 福與直人, Geoffrey Clark, 横山祐典
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 断層湖内で湧出する深部炭素が表層水圏に及ぼす空間的影響評価：放射性炭素アイソスケープ解析 (2023)
  • Author(s): 浦井暖史, 高野淑識, 松井洋平, 岩田拓記, 宮入陽介, 横山祐典, 宮原裕一, 大河内直彦, 朴虎東
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Meridional migrations of the Intertropical convergence Zone during the last deglaciation in the Timor Sea detected by geochemical analysis (2023)
  • Author(s): 根本夏林, 横山祐典, 堀池智之, オブラクタスティーブン, 宮入陽介, 阿瀬貴博
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 最終氷期のグローバルな海水準：ミッシングアイス問題の解消に向けたデータとモデルの密接な協働の重要性 (2023)
  • Author(s): 横山祐典, Lambeck Kurt, De Deckker Patrick, Esat Tezer, Webster Jody, 中田正夫
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 「なまはげ」で撮影したコア画像から抽出した色彩値の分光測色計による較正 (2023)
  • Author(s): 畠山 義矢, オブラクタ スティーブン, 尾田 宗一郎, 井澤 せいら, 宮越 悠吏, 久保田 好美, 入野 智久
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 北海道胆振地方東部の厚真町に分布する1611年慶長奥州地震津波の堆積物 (2023)
  • Author(s): 西村裕一, 高清水康博, 岩城昂平, 石澤尭史, 菅原大助, 横山祐典, 宮入陽介
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 大型の魚類耳石に対する真空下での段階的酸溶解法の開発 (2023)
  • Author(s): 青沼惠人, 安東梢, 宮入陽介, 横山祐典
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Unlocking information about reworking movements of tsunami boulders from paleomagnetic dating (2023)
  • Author(s): 佐藤哲郎, 佐藤雅彦, 山田昌樹, 斉藤央岳, 佐竹健治, 中村教博, 後藤和久, 宮入陽介, 横山祐典
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 別府湾堆積物における人為痕跡数の急激な増加が人新世の始まりの明確な指標となる (2023)
  • Author(s): 加三千宣, F Bruce, S Zhiyuan, 坂口綾, 槻木玲美, 大森貴之, 阿草哲郎, 鈴木克明, 横山祐典, et al.
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] Uncover a world-unique ancient ruin of Nan Madol, the Venice of the Pacific (2023)
  • Author(s): Chuan-Chou Shen, Felicia Beardsley, Shou-Yeh Gong, Osamu Kataoka, Minoru Yoneda, Yusuke Yokoyama, Albert Yu-Min Lin
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] Orbital forcing paced Patagonian Ice Sheet extent and southern climate during the Last Glacial Period (2023)
  • Author(s): Adam David Sproson, Yusuke Yokoyama, Yosuke Miyairi, Takahiro Aze, Vincent J. Clementi, Hailey Riechelson, Samantha C. Bova, Yair Rosenthal, Laurel B. Childress
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] Inorganic carbon cycle in mangrove soils and possibility for assimilation of outwelled mangrove carbon in seagrass and coral ecosystems (2023)
  • Author(s): 中村航, 土屋考人, 宮島利宏, 宮入陽介, 横山祐典, 渡辺謙太, 源平慶, 桑江朝比呂, 佐々木淳
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Establishment of Highly Accurate Age Model Using Radiocarbon Dating of Fossil Pollen Automatically Extracted from Lake Motosu Sediments (2023)
  • Author(s): 太田耕輔, 横山祐典, 宮入陽介, オブラクタスティーブン, 山本真也, Hubert-Ferrari A., V.M.A. Heyvaert, M. De Batist, 藤原治
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] 天然および人工放射性核種を用いた表層泥炭の高時間分解能年代測定 (2023)
  • Author(s): 常岡廉, 太田耕輔, 宮入陽介, 近藤玲介, 横山祐典
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 人新世の正確なタイミングを記録する別府湾の極微量プルトニウム同位体と石垣島サンゴ骨格の放射性炭素 (2023)
  • Author(s): 横山祐典, Tims Stephen, Froehlich Michaela, 平林頌子, 阿瀬貴博, Fifield L Keith, Koll Dominik, 宮入陽介, Pavetich Stefan, 加三千宣
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 耳石の段階溶解法を用いた魚類の生態履歴解析 (2023)
  • Author(s): 宮入陽介, 横山祐典, 安東梢, 青沼惠人, 永田俊
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Radiocarbon quantifies ontogenetic change in carbon sources of fish otolith (2023)
  • Author(s): 安東梢, 横山祐典, 宮入陽介, 西田梢, 林正裕
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Efficient radiocarbon measurements on marine and terrestrial samples for Antropocene and Holocene with Accelerator Mass Spectrometry at the Atmosphere and Ocean Research Institute, University of Tokyo (2023)
  • Author(s): 横山祐典, 宮入陽介, 阿瀬貴博
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Radiocarbon and uranium profiles in marine gastropods around the Japanese archipelago (2023)
  • Author(s): 平林頌子, 阿瀬貴博, 宮入陽介, 菅浩伸, 横山祐典
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Long-Term monthly measurements of dissolved inorganic radiocarbon in water around Fuji Five Lakes for understanding seasonal hydrological variation (2023)
  • Author(s): 太田耕輔, 横山祐典, 宮入陽介, 山本真也, 宮島利宏
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] _Internal structures along the Kuroshio large meander area obtained from dissolved inorganic radiocarbon (2023)
  • Author(s): 蘭慧, 横山祐典, 平林頌子, 宮入陽介, 江思宇, 齊藤宏明, 羽角博康, 安田一郎
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Radiocarbon Variability Recorded in Coral from Kikai Island to Understand Oceanography in the North Western Pacific Region (2023)
  • Author(s): Yuning Zeng, Yusuke Yokoyama, Shoko Hirabayashi, Yosuke Miyairi, Atsushi Suzuki, Takahiro AZE, Yuta Kawakubo
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Holocene climate change along the Chilean margin as determined by beryllium isotope analysis (2023)
  • Author(s): 根本夏林, 横山祐典, Adam Sproson, 宮入陽介, 阿瀬貴博, 松崎浩之, Yair Rosenthal, Samantha Bova, Hailey Riechelson
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 大槌湾で採取したアワビ貝殻と海水中の溶存無機炭素の放射性炭素濃度の比較 (2023)
  • Author(s): 黄子涵, 横山祐典, 太田耕輔, 宮入陽介, 早川純, 平林頌子
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Fossil coral records paleo tsunamis and storm surges on Yakushima Island, Japan (2023)
  • Author(s): Sabrina Gyuliana Lloyd, Yusuke Yokoyama, Takahiro AZE, Yosuke Miyairi, Kohei Abe, Tomoo Echigo
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Exploring groundwater dynamics in Kikaijima, southwest Japan, using radiocarbon, oxygen isotopes, and hydro-chemical data (2023)
  • Author(s): 辻野愛奈, 横山祐典, 平林頌子, 宮入陽介, 宮島利宏
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] Quantitative determination of ontogenetic change in otolith carbon sources using radiocarbon as a novel proxy (2023)
  • Author(s): Kozue Ando, Yusuke Yokoyama, Yosuke Miyairi, Kozue Nishida, Masahiro Hayashi
  • Organizer: ASLO Aquatic Sciences Meeting 2023
  • Int'l Joint Research
• [Presentation] The impact of Antarctic ice sheet expansion (ca. 34 Ma) on silicate weathering, erosion and the carbon cycle: insights from Li and Mg isotopes (2023)
  • Author(s): Adam David Sproson, Toshihiro Yoshimura, Shigeyuki Wakaki, Takahiro Aze, Tsuyoshi Ishikawa, Yusuke Yokoyama, Naohiko Ohkouchi
  • Organizer: Goldschmidt 2023 Conference
  • Int'l Joint Research
• [Presentation] Seven million year record of multiple geochemical proxies of planktonic foraminifera shells collected from marine sediment core (IODP Exp.361 Site U1476) after removal of clay and boron-specific contamination influences (2023)
  • Author(s): Kaoru Kubota, Tsuyoshi Ishikawa, Toshihiro Yoshimura, Katsunori Kimoto, Qing Chang, Minoru Ikehara, Yusuke Yokoyama, Francisco J Jimenez-Espejo, Sidney R Hemming, Stephen Barker, Ian R Hall
  • Organizer: Goldschmidt 2023 Conference
  • Int'l Joint Research
• [Presentation] A new Lateglacial to early Holocene pollen record from Lake Suigetsu, Japan: Contrast with the N. Atlantic region and implications for human history (2023)
  • Author(s): T Nakagawa, P Tarasov, R Staff, C B Ramsey, M Marshall, G Schlolaut, C Bryant, A Rauer, H F. Lamb, T Haraguchi, K Gotanda, I Kitaba, H Kitagawa, J van der Plicht, H Yonenobu, T Omori, Y Yokoyama, R Tada, Y Yasuda & Suigetsu 2006 Project Members
  • Organizer: XXI INQUA CONGRESS
  • Int'l Joint Research
• [Presentation] Cumulative numbers of anthropogenic fingerprints as a potential marker of the onset of the Anthropocene-an example of the Beppu Bay stratigraphy (2023)
  • Author(s): M Kuwae, B Finney, Z Shi, A Sakaguchi, N Tsugeki, T Omori, T Agusa, Y Suzuki, Y Yokoyama, et al.
  • Organizer: XXI INQUA CONGRESS
  • Int'l Joint Research
• [Presentation] Western Pacific landscape changes during the Late Pleistocene and the early Holocene related to global ice volume changes (2023)
  • Author(s): Yusuke Yokoyama
  • Organizer: XXI INQUA CONGRESS
  • Int'l Joint Research
• [Presentation] The AO driven climate change from 3 ka to 2 ka detected by an 8000-year record of dust deposition in Lake Motosu, Mt. Fuji (2023)
  • Author(s): Karin Nemoto, Yusuke Yokoyama, Stephen Obrochta, Shinya Yamamoto, Yosuke Miyairi, Atsunori Nakamura, Osamu Fujiwara, Aurelia Hubert, Laura Lamair, Vanessa M.A. Heyvaert, Marc DeBatist & the QuakeRecNankai Team
  • Organizer: XXI INQUA CONGRESS
  • Int'l Joint Research
• [Presentation] Regionally coherent patterns of organic deposition in Japanese lakes track millennial scale variability in the East Asian Monsoon during Marine Isotope Stage 3 (2023)
  • Author(s): Jonathan Tyler, Alexander Francke, Danielle McLean, Richard Staff, Yusuke Yokoyama, Minoru Ikehara Fujio KUMON & Takeshi Nakagawa
  • Organizer: XXI INQUA CONGRESS
  • Int'l Joint Research
• [Presentation] 層序学上の人新世の始まり (2023)
  • Author(s): 加三千宣, 齋藤文紀, 横山祐典, 槻木玲美, 土居秀幸
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 北海道日高北部地域における津波堆積物から推定される複数の津波波源 (2023)
  • Author(s): 中西諒, 芦寿一郎, 岡村聡, 横山祐典, 宮入陽介
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] ティモール海堆積物に対するベリリウム同位体分析による退氷期における熱帯収束帯移動履歴の復元 (2023)
  • Author(s): 根本夏林, 横山祐典, Stephen Obrochta, 堀池智士
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 表面照射年代測定を用いた岩手県侍浜における海成段丘の離水年代について (2023)
  • Author(s): レゲット佳, 横山祐典, 宮入陽介, 白濱吉起, 阿部恒平 , 照沢秀司
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 鉛－210法に基づく北海道東部湿原における泥炭の炭素固定速度の推定 (2023)
  • Author(s): 常岡 廉, 坂下渉, 近藤玲介, 横山祐典
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 高精度地殻変動履歴復元に向けた複数種の固着性生物遺骸を用いた 14C 年代値の比較 (2023)
  • Author(s): 福與直人, レゲット佳, 宮入陽介, 阿部恒平, 越後智雄, 宍倉正展, 白濱吉起, 横山祐典
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 放射性炭素を用いた魚類水晶体の炭素源の定量的評価 (2023)
  • Author(s): 安東梢, 宮入陽介, 西田梢, 林正裕, 横山祐典
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 日本の樹木年輪中のΔ14C値に基づく 14C 年代較正に関する研究 (2023)
  • Author(s): 阪本昂平, 横山祐典, 坂下渉, 宮入陽介, 阿瀬貴博, 沢田近子, 常岡廉
  • Organizer: 日本第四紀学会2023年大会
• [Presentation] 放射性炭素動態から見た断層湖(諏訪湖)の水圏 生態系解析 (2023)
  • Author(s): 浦井暖史, 高野淑識, 松井洋平, 石川尚人, 宮入陽介, 横山祐典, 宮原裕一, 大河内 直彦
  • Organizer: 日本地球化学会第70回年会
  • Invited
• [Presentation] 放射性炭素を用いた魚類耳石および水晶体の炭素 源の定量的評価 (2023)
  • Author(s): 安東梢, 宮入陽介, 西田梢, 林正裕, 横山祐典
  • Organizer: 日本地球化学会第70回年会
• [Presentation] Migration history of Pacific cod around Hokkaido, Japan, using 14C analysis of otoliths (2023)
  • Author(s): Keito Aonuma, Kozue Ando, Yosuke Miyairi, Masayuki Chimura, Tomonori Hamatsu, Osamu Sakai, Yusuke Yokoyama
  • Organizer: 7th International Otolith Symposium
  • Int'l Joint Research
• [Presentation] 現在（イマ）はいったい何時代？ 奄美に残る人新世のシグナル (2023)
  • Author(s): 横山祐典
  • Organizer: 亜熱帯・KUROSHIO研究教育拠点の形成と展開事業 普及講演会
• [Presentation] ティモール海におけるベリリウム同位体分析による退氷期の降水量復元 (2023)
  • Author(s): 根本 夏林, 横山 祐典, Stephen Obrochta
  • Organizer: 第9回地球環境史学会年会
• [Presentation] 鮮新世の大気中二酸化炭素濃度復元～海底堆積物中の浮遊性有孔虫の殻のホウ素同位体分析 (2023)
  • Author(s): 窪田 薫, 石川 剛志, 吉村 寿紘, 木元 克典, 常 青, 池原 実, 横山祐典, Francisco Jimenes-Espejo, Sidney R. Hemming, Steve Barker, Ian R. Hall
  • Organizer: 第9回地球環境史学会年会
• [Presentation] High-resolution rediocarbon records in corals from NW Pacific reveal past Kuroshio current variations and precise timing of the start of the Anthropocene (2023)
  • Author(s): Yusuke Yokoyama, Shoko Hirabayashi, Yuning Zeng, Stephen Tims, Michinobu Kuwae
  • Organizer: AGU Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Fossilized coral records Holocene tsunamis and storm surges on Yakushima Iskand, Japan (2023)
  • Author(s): Sabrina lloyd, Yusuke Yokoyama, Takahiro Aze, Yosuke Miyairi, Kohei Abe, Tomoo Echigo
  • Organizer: AGU Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Mixing dynamics within the Kuroshio large meadnder area are reflected in dissloved inorganic radiocarbon values (2023)
  • Author(s): Hui Lan, Yusuke Yokoyama, Shoko Hirabayashi, Yosuke Miyairi, Hiroaki Saito, Siyu Jiang, Hiroyasu Hasumi, Ichiro Yasuda
  • Organizer: AGU Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Meridional Migrations of the Intertropical Convergence Zone during the Last Deglaciation in the Timor Sea Detected by Beryllium Isotope Analysis (2023)
  • Author(s): Karin Nemoto, Yusuke Yokoyama, Stephen P. Obrochta
  • Organizer: AGU Annual Meeting 2023
  • Int'l Joint Research