A study on Longterm Environmental changes and Wethering

2022 Fiscal Year Annual Research Report

• Project/Area Number: 20H00193
• 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): 大河内 直彦 国立研究開発法人海洋研究開発機構, 海洋機能利用部門, 部門長 (00281832) ; Obrochta Stephen 秋田大学, 国際資源学研究科, 教授 (60752540)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 古気候 / 古海洋 / 風化

Outline of Annual Research Achievements

前年度に南極の陸域で行ったベリリウムの同位体分析によって明らかになった氷床変動を海域のコアを使って行うべく、東南極および西南極の海洋堆積物についてベリリウムの同位体を分析した。その結果、海域のコアに残されたベリリウム同位体は陸域のそれとは挙動が異なり、侵食作用によってもたらされるベリリウム９の寄与が少なくなり、大気由来のベリリウム１０の変化が顕著になることが明らかになった。年代測定の結果と比較して東南極氷床の融解の過程を復元したところ、この地域においても、棚氷の崩壊を含めた氷床の大規模な変化が完新世に引き起こされたことがわかった。また、西南極氷床においても、同様に海洋コアの同位体を分析したところ、完新世の大規模な融解イベントが明らかになった。とても興味深いことにその融解イベントは海洋のみならず、大気中の降水量が増加して融解が促進されたことと関係しているということだった。先行研究の結果を広く比較して検討したところ、大気の川、いわゆる線状降水帯によってもたらされた降水現象が重要な役割を担っていたことを明らかにした。この現象は低緯度とのリンクを強く示唆しており、結果はNature Communication誌に報告することができた。初年度に導入した堆積物のガンマ線を検出し、より最近の年代測定を行う分析装置の立ち上げも順調に行い、陸域のコアトップの年代測定に適用した。特に北海道地域の泥炭地の堆積速度を定量的に評価した結果、炭素－14の分析結果とも整合的な値が得られ、信頼度の高い分析が可能であることを示すことができた。表層環境システムの中で炭素貯蔵の重要な役割を持つとされている泥炭の沈積速度を定量化できたことは、この研究で得られた重要な知見の一つでもある。

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Intensification of the East Australian Current After ～ 1400 CE (2022)
  • Author(s): Zhai Ruixiang、Mohtadi Mahyar、Dolman Andrew M.、Yokoyama Yusuke、Steinke Stephan
  • Journal Title: Geophysical Research Letters Volume: 49 Pages: e2022GL100945
  • DOI: 10.1029/2022gl100945
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Beppu Bay, Japan, as a candidate Global boundary Stratotype Section and Point for an Anthropocene series (2022)
  • Author(s): Kuwae M,Finney B P,Shi Z,Sakaguchi A,Tsugeki N,Omori T,Agusa T,Suzuki Y,Yokoyama Y,Hinata H,Hatada Y,Inoue J,Matsuoka K,Shimada M,Takahara H,Takahashi S,Ueno D,Amano A,Tsutsumi J, et.al
  • Journal Title: The Anthropocene Review Volume: null Pages: 205301962211350
  • DOI: 10.1177/20530196221135077
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Efficient radiocarbon measurements on marine and terrestrial samples with single stage Accelerator Mass Spectrometry at the Atmosphere and Ocean Research Institute, University of Tokyo (2022)
  • Author(s): Yokoyama Y、Miyairi Y、Aze T、Sawada C、Ando Y、Izawa S、Ueno Y、Hirabayashi S、Fukuyo N、Ota K、Shimizu Y、Zeng Y、Lan H、Tsuneoka R、Ando K、Nemoto K、Obrochta S、Behrens B、Tam E、Leggett K、Rzeszewicz J、Huang Z、Kondo R、Nagata T
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 532 Pages: 62～67
  • DOI: 10.1016/j.nimb.2022.10.006
  • Peer Reviewed / Open Access
• [Journal Article] A rapid and precise method of establishing age model for coral skeletal radiocarbon to study surface oceanography using coupled X-ray photos and ICP-AES measurement (2022)
  • Author(s): Zeng Yuning、Yokoyama Yusuke、Hirabayashi Shoko、Miyairi Yosuke、Suzuki Atsushi、Aze Takahiro、Kawakubo Yuta
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 533 Pages: 23～28
  • DOI: 10.1016/j.nimb.2022.10.005
  • Peer Reviewed / Open Access
• [Journal Article] Holocene melting of the West Antarctic Ice Sheet driven by tropical Pacific warming (2022)
  • Author(s): Sproson Adam D.、Yokoyama Yusuke、Miyairi Yosuke、Aze Takahiro、Totten Rebecca L.
  • Journal Title: Nature Communications Volume: 13 Pages: null
  • DOI: 10.1038/s41467-022-30076-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Plutonium isotopes in the North Western Pacific sediments coupled with radiocarbon in corals recording precise timing of the Anthropocene (2022)
  • Author(s): Yokoyama Yusuke、Tims Stephen、Froehlich Michaela、Hirabayashi Shoko、Aze Takahiro、Fifield L. Keith、Koll Dominik、Miyairi Yosuke、Pavetich Stefan、Kuwae Michinobu
  • Journal Title: Scientific Reports Volume: 12 Pages: null
  • DOI: 10.1038/s41598-022-14179-w
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Two-step movement of tsunami boulders unveiled by modified viscous remanent magnetization and radiocarbon dating (2022)
  • Author(s): Sato Tetsuro、Sato Masahiko、Yamada Masaki、Saito Hirotake、Satake Kenji、Nakamura Norihiro、Goto Kazuhisa、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Scientific Reports Volume: 12 Pages: null
  • DOI: 10.1038/s41598-022-17048-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Metal contamination in a sediment core from Osaka Bay during the last 400 years (2022)
  • Author(s): Nitzsche Kai Nils、Yoshimura Toshihiro、Ishikawa Naoto F.、Kajita Hiroto、Kawahata Hodaka、Ogawa Nanako O.、Suzuki Katsuhiko、Yokoyama Yusuke、Ohkouchi Naohiko
  • Journal Title: Progress in Earth and Planetary Science Volume: 9 Pages: null
  • DOI: 10.1186/s40645-022-00517-z
  • Peer Reviewed / Open Access
• [Journal Article] Towards solving the missing ice problem and the importance of rigorous model data comparisons (2022)
  • Author(s): Yokoyama Yusuke、Lambeck Kurt、De Deckker Patrick、Esat Tezer M.、Webster Jody M.、Nakada Masao
  • Journal Title: Nature Communications Volume: 13 Pages: null
  • DOI: 10.1038/s41467-022-33952-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A comparative study of bedrock fault scarps by s-UAV and t-LiDAR: Insights into site selection criteria for paleo-seismology studies (2022)
  • Author(s): Zou Junjie、He Honglin、Yokoyama Yusuke、Shirahama Yoshiki、Geng Shuang、Zhou Yongsheng、Wei Zhanyu、Shi Feng、Zhou Chao、Sun Wen
  • Journal Title: Geomorphology Volume: 414 Pages: 108372～108372
  • DOI: 10.1016/j.geomorph.2022.108372
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The pteropod species Heliconoides inflatus as an archive of late Pleistocene to Holocene environmental conditions on the Northwest Shelf of Australia (2022)
  • Author(s): Hallenberger Maximilian、Reuning Lars、Takayanagi Hideko、Iryu Yasufumi、Keul Nina、Ishiwa Takeshige、Yokoyama Yusuke
  • Journal Title: Progress in Earth and Planetary Science Volume: 9 Pages: null
  • DOI: 10.1186/s40645-022-00507-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A safer preprocessing system for analyzing dissolved organic radiocarbon in seawater (2022)
  • Author(s): Otosaka Shigeyoshi、Jeon Hyunduck、Hou Yunxuan、Watanabe Takahiro、Aze Takahiro、Miyairi Yosuke、Yokoyama Yusuke、Ogawa Hiroshi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 527 Pages: 1～6
  • DOI: 10.1016/j.nimb.2022.07.003
  • Peer Reviewed / Open Access
• [Journal Article] Spatial Extent of Mid‐To Late‐Holocene Sedimentary Record of Tsunamis Along the Southern Kuril Trench, Hokkaido, Japan (2022)
  • Author(s): Nakanishi Ryo、Ashi Juichiro、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 23 Pages: null
  • DOI: 10.1029/2022GC010334
  • Peer Reviewed / Open Access
• [Journal Article] Preservation of exopolymeric substances in estuarine sediments (2022)
  • Author(s): Duteil Thibault、Bourillot Raphael、Braissant Olivier、Gregoire Brian、Leloup Maud、Portier Eric、Brigaud Benjamin、Fenies Hugues、Svahn Isabelle、Henry Adrien、Yokoyama Yusuke、Visscher Pieter T.
  • Journal Title: Frontiers in Microbiology Volume: 13 Pages: null
  • DOI: 10.3389/fmicb.2022.921154
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Constraining rapid sea level change through radiometric dating of corals growing over a range in paleowater depths (2022)
  • Author(s): Esat Tezer M.、Yokoyama Yusuke、Webster Jody M.
  • Journal Title: Quaternary Science Advances Volume: 7 Pages: 100053～100053
  • DOI: 10.1016/j.qsa.2022.100053
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Beryllium isotope variations recorded in the Adelie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency (2022)
  • Author(s): Behrens Bethany C.、Yokoyama Yusuke、Miyairi Yosuke、Sproson Adam D.、Yamane Masako、Jimenez-Espejo Francisco J.、McKay Robert M.、Johnson Katelyn M.、Escutia Carlota、Dunbar Robert B.
  • Journal Title: Quaternary Science Advances Volume: 7 Pages: 100054～100054
  • DOI: 10.1016/j.qsa.2022.100054
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Origin of Deep Methane from Active Faults along the Itoigawa Shizuoka Tectonic Line between the Eurasian and North American Plates: 13C/12C and 14C/12C Methane Profiles from a Pull-Apart Basin at Lake Suwa (2022)
  • Author(s): Urai Atsushi、Takano Yoshinori、Matsui Yohei、Iwata Hiroki、Miyairi Yosuke、Yokoyama Yusuke、Miyabara Yuichi、Ohkouchi Naohiko、Park Ho-Dong
  • Journal Title: ACS Earth and Space Chemistry Volume: 6 Pages: 1689～1697
  • DOI: 10.1021/acsearthspacechem.1c00392
  • Peer Reviewed / Open Access
• [Journal Article] Chronostratigraphy of sediment cores from Lake Selina, southeastern Australia: Radiocarbon, optically stimulated luminescence, paleomagnetism, authigenic beryllium isotopes and elemental data (2022)
  • Author(s): Lise-Pronovost Agathe、Fletcher Michael-Shawn、Simon Quentin、Jacobs Zenobia、Gadd Patricia S.、Herries Andy I.R.、Yokoyama Yusuke
  • Journal Title: Data in Brief Volume: 42 Pages: 108144～108144
  • DOI: 10.1016/j.dib.2022.108144
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Major environmental drivers determining life and death of cold-water corals through time (2022)
  • Author(s): Portilho-Ramos Rodrigo da Costa、Titschack Jurgen、Wienberg Claudia、Siccha Rojas Michael Georg、Yokoyama Yusuke、Hebbeln Dierk
  • Journal Title: PLOS Biology Volume: 20 Pages: e3001628
  • DOI: 10.1371/journal.pbio.3001628
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The origin of methane in serpentinite-hosted hyperalkaline hot spring at Hakuba Happo, Japan: Radiocarbon, methane isotopologue and noble gas isotope approaches (2022)
  • Author(s): Suda Konomi、Aze Takahiro、Miyairi Yosuke、Yokoyama Yusuke、Matsui Yohei、Ueda Hisahiro、Saito Takuya、Sato Tomohiko、Sawaki Yusuke、Nakai Ryosuke、Tamaki Hideyuki、Takahashi Hiroshi A.、Morikawa Noritoshi、Ono Shuhei
  • Journal Title: Earth and Planetary Science Letters Volume: 585 Pages: 117510～117510
  • DOI: 10.1016/j.epsl.2022.117510
  • Peer Reviewed / Open Access
• [Journal Article] Paleotsunami history along the northern Japan trench based on sequential dating of the continuous geological record potentially inundated only by large tsunamis (2022)
  • Author(s): Ishizawa Takashi、Goto Kazuhisa、Nishimura Yuichi、Miyairi Yosuke、Sawada Chikako、Yokoyama Yusuke
  • Journal Title: Quaternary Science Reviews Volume: 279 Pages: 107381～107381
  • DOI: 10.1016/j.quascirev.2022.107381
  • Peer Reviewed / Open Access
• [Journal Article] Natal origin of Pacific bluefin tuna Thunnus orientalis determined by SIMS oxygen isotope analysis of otoliths (2022)
  • Author(s): Hane Yulina、Ushikubo Takayuki、Yokoyama Yusuke、Miyairi Yosuke、Kimura Shingo
  • Journal Title: PLOS ONE Volume: 17 Pages: e0272850
  • DOI: 10.1371/journal.pone.0272850
  • Peer Reviewed / Open Access
• [Journal Article] Holocene coastal evolution, past tsunamis, and extreme wave event reconstructions using sediment cores obtained from the central coast of Hidaka, Hokkaido, Japan (2022)
  • Author(s): Nakanishi Ryo、Ashi Juichiro、Miyairi Yosuke、Yokoyama Yusuke
  • Journal Title: Marine Geology Volume: 443 Pages: 106663～106663
  • DOI: 10.1016/j.margeo.2021.106663
  • Peer Reviewed / Open Access
• [Presentation] 東北地方における地殻変動履歴復元に向けたエゾカサネカンザシゴカイの適用可能性の検討 (2022)
  • Author(s): レゲット 佳, 横山 祐典, 白濱 吉起, 宮入 陽介, 福與 直人, 太田 耕輔, 阿部 恒平, 照沢 秀司, 越後 智雄
  • Organizer: 日本地球惑星科学連合2022年大会
  • Invited
• [Presentation] 断層湖堆積盆から湧出する深部メタンの起源と表層生態系への影響：糸魚川静岡構造線と中央構造線の交点のカーボンサイクル (2022)
  • 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2022年大会
  • Invited
• [Presentation] Marine fish migration history reconstructed from novel radiocarbon in otolith retrieved from walleye pollock around Hokkaido, Japan (2022)
  • Author(s): 安東 梢, 横山 祐典, 宮入 陽介, 境 磨, 濱津 友紀, 寺島 一郎, 永田 俊
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] 三陸海岸北部～中部における古津波履歴の高確度復元 (2022)
  • Author(s): 石澤 尭史, 後藤 和久, 西村 裕一, 宮入 陽介, 沢田 近子, 横山 祐典
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Can Mg and Li isotopes in the authigenic and detrital fractions of sediments be used to trace paleoweathering Case study: The EOT (2022)
  • Author(s): Adam David Sproson, Toshihiro Yoshimura, Takahiro AZE, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Yusuke Yokoyama, Naohiko Ohkouchi
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] 北西部北太平洋における溶存有機態放射性炭素の分布と溶存有機物の動態 (2022)
  • Author(s): 侯 蘊軒, 乙坂 重嘉, 脇田 昌英, 山下 洋平, 西岡 純, 小畑 元, 宮入 陽介, 横山 祐典, 小川 浩史
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] 137Cs法および210Pb法に基づく湿原堆積物表層の高時間分解能年代測定 (2022)
  • Author(s): 常岡 廉, 横山 祐典, 太田 耕輔, 宮入 陽介, 近藤 玲介, 横地 穣, 金子 和広, 井上 京, 紀藤 典夫, 植村 杏太, 隅田 まり, 百原 新, 冨士田 裕子
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] 北海道根室半島周辺の海成段丘上とその周辺における湿原堆積物の層序 (2022)
  • Author(s): 近藤 玲介, 百原 新, 紀藤 典夫, 井上 京, 吉田 明弘, 横地 穣, 金子 和広, 嵯峨山 積, 隅田 まり, 重野 聖之, 植村 杏太, 宮入 陽介, 坂本 竜彦, 竹村 貴人, 横山 祐典, 冨士田 裕子
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Antarctic slope current intensification following Last Glacial Maximum ice retreat (2022)
  • Author(s): Bethany C. Behrens, Yusuke Yokoyama, Yosuke Miyairi, Alexandra L Post, Leanne K Armand, Stephen P Obrochta, Naohiko Ohkouchi, Hisami Suga, Takato Takemura, Philip E O'Brien
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Long-Term monthly measurements of dissolved inorganic radiocarbon in water at Lake Motosu and Lake Kawaguchi to understand seasonal hydrological variations (2022)
  • 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2022年大会
• [Presentation] Skeletal Ba/Ca in a long living Porites coral in Kikai Island, Ryukyu, Japan reveals changes in carbonate chemistry due to recent ocean acidification (2022)
  • Author(s): 川久保 友太, 横山 祐典, 平林 頌子, 鈴木 淳, 宮入 陽介
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Can speleothem magnetic minerals record a past volcanic eruption in Tonga? (2022)
  • Author(s): 福與 直人, 小田 啓邦, 横山 祐典, Geoffrey Clark, 山本 裕二
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Regional and global forcing of Holocene Totten Glacier retreat from deep-sea sediments perspective (2022)
  • Author(s): Zihan Huang, べレンス ベサニー, 宮入 陽介, 阿瀬 貴博, オブラクタ スティーブン, 竹村 貴人, 近藤 玲介, ポスト アリックス, リアン アルマンド, オブライエン フィリップ, 横山 祐典
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] An 8000-year record of East Asian dust deposition in Lake Motosu (2022)
  • Author(s): 根本 夏林, 横山 祐典, オブラクタ スティーブン, 山本 真也, 宮入 陽介, 中村 淳路, Lamair Laura, Hubert-Ferrari Aurelia, Heyvaert Vanessa, De Batist Marc, 藤原 治, the QuakeRecNankai Team
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] The dual tracer, 236U and 14C, records in coral core in the western Pacific (2022)
  • Author(s): Jian-Ming Chen, Hong-Wei Chiang, Chuan-Chou Shen, Yu-Chen Chou, Yusuke Yokoyama, Horng-Sheng Mii, Yi-Chia Hsin, Huei-Ting (Tina) Lin
  • Organizer: Goldschmidt2022
  • Int'l Joint Research
• [Presentation] A novel application of Mg and Li isotopes reveals a link between erosion, chemical weathering, and atmospheric CO2 during the expansion of Antarctica’s ice sheets (ca. 34 Ma) (2022)
  • Author(s): Adam David Sproson, Toshihiro Yoshimura, Takahiro Aze, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Yusuke Yokoyama, Nao Ohkouchi
  • Organizer: Goldschmidt2022
  • Int'l Joint Research
• [Presentation] 房総沖掘削コアC9010Eのテフラ層序‐海底火山大室ダシ起源と推定される3万年前のテフラの発見‐ (2022)
  • Author(s): 青木かおり, 小林 淳, 村田昌則, 宮入陽介, 横山祐典, 鈴木毅彦
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 北海道日高地域において復元された完新世の古海水準・堆積環境変化とイベント層の形成・保存に与える影響 (2022)
  • Author(s): 中西 諒 芦 寿一郎, 宮入陽介, 横山祐典
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 本栖湖における過去8000年間のダスト輸送履歴および気候変動との関連 (2022)
  • Author(s): 根本夏林,横山祐典,Stephen Obrochta,山本真也,宮入陽介,中村淳路,Lamair Laura, Hubert-Ferrari Aurelia, Heyvaert Vanessa, De Batist Marc,藤原 治, the QuakeRecNankai Team
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 層泥炭の放射性炭素および放射性セシウム濃度に基づく高時間分解能年代測定 (2022)
  • Author(s): 常岡 廉,横山祐典,太田耕輔,宮入陽介
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 東北地方で採取されたスギのセルロース炭素同位体比から復元した日照率とインド洋ダイポールモードおよびアリューシャン低気圧との関係 (2022)
  • Author(s): 坂下 渉,横山祐典,Chang-Chin Wang,宮原ひろ子, 阿瀬貴博,大山幹成,米延仁志
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 静岡県相良低地のコア試料の貝化石・元素分析結果が示す完新世中期の環境変化 (2022)
  • Author(s): 太田耕輔,藤原 治,Stephen Obrochta,宮入陽介,横山祐典
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 千葉県房総半島東部夷隅川河口低地における放射性炭素年代測定とオーバーウォッ シュによる環境変化 (2022)
  • Author(s): 尾田宗一郎,スティーブン,オブラクタ,藤原 治,横山祐典,宮入陽介,畠山義矢
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 福江島における砂丘のpIRIR年代測定 (2022)
  • Author(s): 近藤玲介,植村杏太,高場智博, 宮入陽介,横山祐典,坂本竜彦
  • Organizer: 日本第四紀学会2022大会
• [Presentation] U/Th年代測定および14C年代測定による熊本県球泉洞の石筍の年代決定とDCF変化 (2022)
  • Author(s): 平林頌子,石沢成美,宮入陽介,阿瀬貴博,横山祐典
  • Organizer: 日本第四紀学会2022大会
• [Presentation] トンガ王国の鍾乳石の岩石磁気学的手法による噴火履歴復元の可能性 (2022)
  • Author(s): 福與直人,小田啓邦,横山祐典,Geoffrey Clark,山本裕二
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 最終間氷期およびMIS5eの海岸線の日本における分布について (2022)
  • Author(s): 横山祐典,タン エバン,尾崎達也
  • Organizer: 日本第四紀学会2022大会
• [Presentation] 耳石の段階融解炭素14分析を用いた駿河湾魚類の棲息環境の推定 (2022)
  • Author(s): 宮入陽介,横山祐典,永田 俊
  • Organizer: 日本第四紀学会2022大会
• [Presentation] Eruption History of Mt. Fuji Further Constrained Through Radiocarbon Dating of Fossil Pollen Automatically Extracted from Lake Motosu Sediments (2022)
  • Author(s): Ota K, Yokoyama Y, Miyairi Y, Obrochta S, Yamamoto S, Aurelia H, V.M.A. H, M. De B, Fujiwara O
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research / Invited
• [Presentation] Radiocarbon dating and differentiation of tsunami deposits from the Isumi River lowland, Eastern Boso Peninsula, Japan (2022)
  • Author(s): Soichiro O, Obrochta S, Fujiwara O, Yokoyama Y, Miyairi Y, Hatakeyama Y
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research
• [Presentation] Radiocarbon geochemistry of amino acids in marine sediments (2022)
  • Author(s): Blattmann T, Ishikawa N, Keil R, Yokoyama Y, Ogawa N, Haghipour N, Sun Y, Neibauer J, Duffy M, Suga H, Miyairi Y, Eglinton T, Takano Y, Ohkouchi N
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research
• [Presentation] U/Th dating and radiocarbon measurement potentials using marine mollusks around Japanese archipelago (2022)
  • Author(s): Hirabayashi S, Aze T, Miyairi Y, Kan H, Yokoyama Y
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research
• [Presentation] Paleoclimate study in the Indonesian throughflow region using carbon and beryllium isotopes (2022)
  • Author(s): Nemoto K, Yokoyama Y, Horiike S, Obrochta S, Miyairi Y, Aze T
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research
• [Presentation] Mid- to Late- Holocene sea level changes recorded in corals from Philippines (2022)
  • Author(s): Yokoyama Y, Maeda Y, Siringan F, Miyairi Y, Aze T, Sawada C
  • Organizer: 24th Radiocarbon
  • Int'l Joint Research
• [Presentation] 東京大学大気海洋研究所シングルステージ AMS の現状 2022 (2022)
  • Author(s): 阿瀬 貴博 , 宮入 陽介, 沢田 近子, 安藤 有加, 伊澤 里美, 上野 祥子, 打田 麻夕子, 横山 祐典
  • Organizer: 第 23 回 AMS シンポジウム
• [Presentation] 14C 試料の前処理におけるグラファイト-鉄比調整のための鉄添加の影響評価 (2022)
  • Author(s): 沢田 近子, 阿瀬 貴博, 宮入 陽介, 安藤 有加, 伊澤 里美, 上野 祥子, 横山 祐典
  • Organizer: 第 23 回 AMS シンポジウム
• [Presentation] Southern Hemisphere pacing of global climate during the Late Pleistocene (2022)
  • Author(s): Adam Sproson, Yusuke Yokoyama, Yosuke Miyairi, Takahiro Aze, Vincent J Clementi, Hailey Riechelson, Samantha Claudia Bova, Yair Rosenthal, Laurel B Childress, Expedition 379T Scientists
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Holocene Ice Loss in the Amundsen Sea Embayment Linked to Tropical Pacific Warming (2022)
  • Author(s): Adam Sproson, Yusuke Yokoyama, Yosuke Miyairi, Takahiro Aze, Rebecca L Totten
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Determining Shell Carbonate and Soft Tissue End-Member Contributions of the Japanese Surf Clam Pseudocardium sachalinense using Reverse Radioisotope Labelling Techniques (2022)
  • Author(s): Hannah Rzeszewicz, Gig Harbor, Yusuke Yokoyama
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Assessing Holocene Fault Movement along the Hinagu Fault Zone using Paleo-Sea Level Extents at Kawata Machinishi, Kumamoto, Japan (2022)
  • Author(s): Evan Tam, Yusuke Yokoyama, Yukari Miyashita, Glenn A. Milne, Yosuke Miyairi
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] A Magnetic and Geochemical Approach to the Changing Sedimentation Patterns in Response to Glacio-eustatic Changes at the Great Barrier Reef (2022)
  • Author(s): Muhammad Bin Hassan, Gabriel Tagliaro, Brandon B Harper, Andre Willy Droxler, Emilio Herrero-Bervera, Yusuke Yokoyama, Angel Puga Bernab_u Sr., Jody Webster, Luigi Jovane
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Melting of Totten Glacier, East Antarctica since the Last Glacial Maxima Revealed by Beryllium Isotope Ratios and Grain Size Analysis of Marine Sediment Records (2022)
  • Author(s): Zihan Huang, Bethany Behrens, Yosuke Miyairi, Takahiro Aze, Stephen Obrochta, Takato Takemura, Reisuke Kondo, Alexandra Post, Leanne Armand, Philip O'Brien, Yusuke Yokoyama
  • Organizer: AGU fall meeting
  • Int'l Joint Research