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Reconstruction of atmospheric carbon dioxide concentration during the last 6 million years and the study of the interaction between atmospheric carbon dioxide and climate

Research Project

Project/Area Number 19H05595
Research Category

Grant-in-Aid for Scientific Research (S)

Allocation TypeSingle-year Grants
Review Section Broad Section B
Research InstitutionHokkaido University

Principal Investigator

Yamamoto Masanobu  北海道大学, 地球環境科学研究院, 教授 (60332475)

Co-Investigator(Kenkyū-buntansha) 吉森 正和  東京大学, 大気海洋研究所, 准教授 (20466874)
阿部 彩子  東京大学, 大気海洋研究所, 教授 (30272537)
関 宰  北海道大学, 低温科学研究所, 准教授 (30374648)
入野 智久  北海道大学, 地球環境科学研究院, 准教授 (70332476)
Project Period (FY) 2019-06-26 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥202,150,000 (Direct Cost: ¥155,500,000、Indirect Cost: ¥46,650,000)
Fiscal Year 2023: ¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2022: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2021: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2020: ¥83,590,000 (Direct Cost: ¥64,300,000、Indirect Cost: ¥19,290,000)
Fiscal Year 2019: ¥69,420,000 (Direct Cost: ¥53,400,000、Indirect Cost: ¥16,020,000)
Keywords二酸化炭素 / 温室効果 / C4植物 / 氷期間氷期変動 / 気候変動 / 海底コア / 長鎖脂肪酸 / 同位体 / CO2 / 気候 / 氷床 / CO2濃度 / 大陸氷床 / 温暖期 / 海洋循環 / プロキシ / 古気候 / 二酸化炭素濃度 / 過去600万年間 / 環境変動 / 深海掘削
Outline of Research at the Start

温室効果は地球表層の温度を決める重要な要素であり,過去の大気中CO2濃度を復元することは,地球の気候の歴史を考えるうえで極めて重要であるが,80万年前以前のCO2濃度の精密復元は行われていない.本研究では,ベンガル湾の堆積物コアに含まれる長鎖脂肪酸の安定炭素同位体比を測定し,600万年前から150万年前の大気中CO2濃度を復元する.得られたデータにもとづき,鮮新世における気候感度(CO2濃度と気温の関係)を推定する.さらに,過去600万年間のCO2濃度と海洋深層水温度・気温・氷床量変動との関係から,CO2濃度変動の原因を考察し,CO2と気候の相互作用を解明する.

Outline of Final Research Achievements

Using an original method based on carbon isotope ratios of long-chain fatty acids, we found that the highest atmospheric CO2 concentration over the past 6 million years was only around 300 ppm. The results also revealed that the CO2 concentration decreased from 3.5 million to 2.5 million years ago, and that the period of change modulated from 400,000 to 40,000 years at the time when the CO2 concentration dropped first to around 190 ppm. The long-term decrease in CO2 concentration was synchronized with the oxidation in the deep Pacific Ocean, presumably resulting from a decrease in the total amount of carbon in the atmosphere-ocean system.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた過去600万年間の大気中CO2濃度記録は,従来の過去80万年間のアイスコア気泡のCO2濃度記録
をはるかに超えており,過去の環境変動・気候変動の原因を考察するうえで不可欠なデータである.IPCCでの地
球環境予測評価等,地球環境研究において広範囲に活用されることが予想される.

Assessment Rating
Ex-post Assessment Comments (Rating)

A: In light of the aim of introducing the research area into the research categories, expected outcomes of research have been produced.

Assessment Rating
Interim Assessment Comments (Rating)

A: In light of the aim of introducing the research area into the research categories, the expected progress has been made in research.

Report

(11 results)
  • 2024 Ex-post Assessment (Comments) ( PDF )
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Abstract (Interim Assessment) ( PDF )   Annual Research Report   Interim Assessment (Comments) ( PDF )
  • 2020 Annual Research Report
  • 2019 Abstract ( PDF )   Comments on the Screening Results ( PDF )   Annual Research Report
  • Research Products

    (55 results)

All 2023 2022 2021 2020 2019 Other

All Journal Article (21 results) (of which Int'l Joint Research: 14 results,  Peer Reviewed: 21 results,  Open Access: 10 results) Presentation (31 results) (of which Int'l Joint Research: 9 results,  Invited: 4 results) Remarks (3 results)

  • [Journal Article] 山本正伸過去の大気中二酸化炭素濃度を復元する試み(2016年度有機地球化学賞受賞記念総説)2023

    • Author(s)
      山本正伸
    • Journal Title

      Researches in Organic Geochemistry

      Volume: 39 Pages: 1-12

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multiple episodes of ice loss from the Wilkes Subglacial Basin during the Last Interglacial2023

    • Author(s)
      7.Iizuka M, Seki O, Wilson D J, Suganuma Y, Horikawa K, van de Flierd T, Ikehara M, Itaki T, Irino T, Yamamoto M, Hirabayashi M, Matsuzaki H, Sugisaki S
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 1-10

    • DOI

      10.1038/s41467-023-37325-y

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Amplified surface warming in the south-west Pacific during the mid-Pliocene (3.3-3.0 Ma) and future implications2023

    • Author(s)
      6.Georgia R. Grant, Jonny H. T. Williams, Sebastian Naeher, Osamu Seki, Erin L. McClymont, Molly O. Patterson, Alan M. Haywood, Erik Behrens, Masanobu Yamamoto, and Katelyn Johnson
    • Journal Title

      Climate of the Past

      Volume: 19 Issue: 7 Pages: 1359-1381

    • DOI

      10.5194/cp-19-1359-2023

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Towards a Cenozoic history of atmospheric CO2.2023

    • Author(s)
      Cenozoic CO2 Proxy Integration Project (CenCO2PIP,関宰がプロジェクトメンバー) Consortium
    • Journal Title

      Science

      Volume: 382 Pages: 1136-1136

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Astronomical forcing shaped the timing of early Pleistocene glacial cycles2023

    • Author(s)
      Watanabe, Y., Abe-Ouchi, A., Saito, F., Kino, K. O'ishi, R., Ito, T., Kawamura, K., Chan, W.-L.
    • Journal Title

      Communications Earth and Environments

      Volume: 4 Issue: 1 Pages: 113-113

    • DOI

      10.1038/s43247-023-00765-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Increased interglacial atmospheric CO2 levels followed the mid-Pleistocene Transition2022

    • Author(s)
      Yamamoto Masanobu, Clemens Steven C.、Seki Osamu、Tsuchiya Yuko、Huang Yongsong、O’ishi Ryouta、Abe-Ouchi Ayako
    • Journal Title

      Nature Geoscience

      Volume: 15 Issue: 4 Pages: 307-313

    • DOI

      10.1038/s41561-022-00918-1

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Environmental evolution and fire history of Rebun Island (Northern Japan) during the past 17,000 years based on biomarkers and pyrogenic compound records from Lake Kushu2022

    • Author(s)
      Yamamoto Masanobu、Wang Fangxian、Irino Tomohisa、Yamada Kazuyoshi、Haraguchi Tsuyoshi、Nakamura Hideto、Gotanda Katsuya、Yonenobu Hitoshi、Leipe Christian、Chen Xuan-Yu、Tarasov Pavel E.
    • Journal Title

      Quaternary International

      Volume: 623 Pages: 8-18

    • DOI

      10.1016/j.quaint.2021.09.015

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Reconstruction of the Eukaryotic Communities in Beppu Bay Over the Past 50?Years Based on Sedimentary DNA Barcoding2022

    • Author(s)
      Segawa Yudai、Yamamoto Masanobu、Kuwae Michinobu、Moriya Kazuyoshi、Suzuki Hitoshi、Suzuki Koji
    • Journal Title

      Journal of Geophysical Research: Biogeosciences

      Volume: 127 Issue: 6

    • DOI

      10.1029/2022jg006825

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Decadal-centennial-scale solar-linked climate variations and millennial-scale internal oscillations during the Early Cretaceous2022

    • Author(s)
      Hasegawa Hitoshi, Katsuta Nagayoshi, Muraki Yasushi, Heimhofer Ulrich, Ichinnorov Niiden, Asahi Hirofumi, Ando Hisao, Yamamoto Koshi, Murayama Masafumi, Ohta Tohru, Yamamoto Masanobu, Ikeda Masayuki, Ishikawa Kohki, Kuma Ryusei, Hasegawa Takashi, Hasebe Noriko, Nishimoto Shoji and four others
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 21894-21894

    • DOI

      10.1038/s41598-022-25815-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Beppu Bay, Japan, as a candidate Global Boundaries Stratotype Section and Point for an Anthropocene series2022

    • Author(s)
      Kuwae, M., Finney, B. P.,.. Hirose, K., Suzuki, H. and Saito, Y.
    • Journal Title

      Behavior of Radionuclides in the Environment

      Volume: 20530196221135077 Issue: 1 Pages: 1-38

    • DOI

      10.1177/20530196221135077

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 別府湾堆積物の花粉および微粒炭分析に基づく後期完新世における照葉樹林の衰退過程2022

    • Author(s)
      嶋田美咲・高原光・加三千宣・池原研・入野智久・山本正伸・山田圭太郎・竹村恵二
    • Journal Title

      植生史研究

      Volume: 32 Pages: 15-25

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Greenhouse Gas and Ice Volume Drive Pleistocene Indian Summer Monsoon Precipitation Isotope Variability2021

    • Author(s)
      McGrath Sarah M.、Clemens Steven C.、Huang Yongsong、Yamamoto Masanobu
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 4

    • DOI

      10.1029/2020gl092249

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Remote and local drivers of Pleistocene South Asian Summer Monsoon precipitation: A test for future predictions.2021

    • Author(s)
      Clemens, S. C., Yamamoto, M., Thirumalai, K., Giosan, L., Richey, J. N., Nilsson-Kerr, K., Rosenthal, Y., Anand, P., McGrath, S.
    • Journal Title

      Science Advances

      Volume: 7 Issue: 23

    • DOI

      10.1126/sciadv.abg3848

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A Lacustrine Biomarker Record From Rebun Island Reveals a Warm Summer Climate in Northern Japan During the Early Middle Holocene Due to a Stronger North Pacific High2021

    • Author(s)
      Yamamoto Masanobu、Wang Fangxian、Irino Tomohisa、Suzuki Kenta、Yamada Kazuyoshi、Haraguchi Tsuyoshi、Gotanda Katsuya、Yonenobu Hitoshi、Chen Xuan-Yu、Tarasov Pavel
    • Journal Title

      Frontiers in Earth Science

      Volume: 9 Pages: 704332-704332

    • DOI

      10.3389/feart.2021.704332

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New radiocarbon estimation method for carbonate-poor sediments: A case study of ramped pyrolysis 14C dating of postglacial deposits from the Alaskan margin, Arctic Ocean.2021

    • Author(s)
      Suzuki, K., Yamamoto, M., Rosenheim, B. E., Omori, T., Polyak, L.
    • Journal Title

      Quaternary Geochronology

      Volume: 66 Pages: 101215-101215

    • DOI

      10.1016/j.quageo.2021.101215

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Cellulose oxygen isotopes of Sphagnum and vascular plants in a peat core reveal climate change in northern Japan over the past 2,000 years.2021

    • Author(s)
      Sakurai, H., Yamamoto, M., Seki, O., Omori, T., Sato, T.
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 22 Issue: 9

    • DOI

      10.1029/2020gc009597

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Tropical Western Pacific Hydrology During the Last 6,000?Years Based on Wildfire Charcoal Records From Borneo2021

    • Author(s)
      Yamamoto Masanobu、Kikuchi Takafumi、Sakurai Hiromichi、Hayashi Ryoma、Seki Osamu、Omori Takayuki、Sulaiman Abdullah、Shaari Hasrizal、Abdullah Mohd Zulhilmy、Melling Lulie
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 18

    • DOI

      10.1029/2021gl093832

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The significance of pyrogenic polycyclic aromatic hydrocarbons in Borneo peat core for the reconstruction of fire history.2021

    • Author(s)
      Kong, S. R., Yamamoto, M., Shaari, H., Hayashi, R., Seki, O., Tahir, N. M., Fadzil, M. F., Sulaiman, A.
    • Journal Title

      PLoS ONE

      Volume: 16 Issue: 9 Pages: e0256853-e0256853

    • DOI

      10.1371/journal.pone.0256853

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau.2021

    • Author(s)
      Yuan, H., Meng, F., Yamamoto, M., Liu, X., Dong, H., Shen, J., Yin, H., Wang, J.,Wang, J.
    • Journal Title

      Ecological Indicators

      Volume: 126 Pages: 107625-107625

    • DOI

      10.1016/j.ecolind.2021.107625

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Genetic Diversity of Ligidium Isopods in Hokkaido and Niigata, Northern Japan, Based on Mitochondrial DNA Analysis2020

    • Author(s)
      Harigai Wakana、Saito Aya、Suzuki Hitoshi、Yamamoto Masanobu
    • Journal Title

      Zoological Science

      Volume: 37 Issue: 5 Pages: 417-428

    • DOI

      10.2108/zs200017

    • NAID

      210000179479

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Late Miocene changes in C3, C4 and aquatic plant vegetation in the Indus River basin: evidence from leaf wax δ13C from Indus Fan sediments2020

    • Author(s)
      Suzuki Kenta、Yamamoto Masanobu、Seki Osamu
    • Journal Title

      Geological Magazine

      Volume: 157 Issue: 6 Pages: 979-988

    • DOI

      10.1017/s0016756819001109

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Reconstruction of atmospheric CO2 concentration over the past 1.5 million years based on leaf wax (long-chain n-fatty acid) carbon isotope record from the Bay of Bengal.2023

    • Author(s)
      Yamamoto, M., Clemens, S., Irino, T., Seki, O., Tsuchiya, Y., Huang, Y., O’ishi, R., Abe-Ouchi, A.
    • Organizer
      XXI INQUA Congress 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CO2 reconstruction based on Indian C3/C4 vegetation changes over the past 1.46 million years. PMIP2023

    • Author(s)
      Yamamoto, M., Clemens, S., Irino, T., Seki, O., Tsuchiya, Y., Huang, Y., O’ishi, R., Abe-Ouchi, A.
    • Organizer
      Beyond EPICA seminar series
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 古気候モデリングを通して考える.北極域温暖化増幅のメカニズム.2023

    • Author(s)
      吉森正和
    • Organizer
      東京大学大気海洋研究所研究集会「古気候研究におけるプロキシとモデルの融合: 温暖期の気候変動について」.
    • Related Report
      2023 Annual Research Report
  • [Presentation] 古気候モデリングを通して考える.気候感度と北極域温暖化増幅.2023

    • Author(s)
      吉森正和
    • Organizer
      CPS-ABCワークショップ「地球型惑星の気候を地球古気候研究から考える」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] A 1.46-million-year record of atmospheric CO2 from sedimentary leaf wax in the Bay of Bengal.2022

    • Author(s)
      Yamamoto, M., Clemens, S.C., Seki, O., Tsuchiya, Y., Huang, Y., O’ishi, R., Abe-Ouchi, A.
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Drier climates in Papua New Guinea during interglacials over the past 1.68 million years.2022

    • Author(s)
      Yamamoto, M., Kikuchi, S., Bova, S., Rosenthal, Y
    • Organizer
      2022 Goldschmidt Conference, Honolulu
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 過去150万年間の大気中二酸化炭素濃度を解明2022

    • Author(s)
      山本正伸,スティーブ・クレメンス,関宰,土屋優子,ヨンソン・フアン,大石龍太, 阿部彩子
    • Organizer
      地球環境史学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Reconstruction of atmospheric CO2 concentration over the past 1.5 million years based on leaf wax (long-chain n-fatty acid) carbon isotope record from the Bay of Bengal.2022

    • Author(s)
      Yamamoto, M., Clemens, S.C., Seki, O., Tsuchiya, Y., Huang, Y., O’ishi, R., Abe-Ouchi, A.
    • Organizer
      COLDEX seminar
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tropical Western Pacific hydrology during the last 6,000 years based on wildfire charcoal records from Borneo.2021

    • Author(s)
      Yamamoto, M., Kikuchi, T., Sakurai, H., Hayashi, R., Seki, O., Omori, T., Sulaiman, A., Shaari, H., Abdullah, M. Z., Melling, L.
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 泥炭コアに含まれるミズゴケとイネ科植物のセルロース酸素同位体比からみた過去4400年間の利尻島の気候変化,北海道の歴史との関連2021

    • Author(s)
      山本正伸・関宰
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Millennial variability in precipitation in Papua New Guinea during the last deglaciation.2021

    • Author(s)
      Sudo, G., Yamamoto, M., Bova, S., Rosenthal, Y.
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] リーフワックス炭素同位体比を用いた古CO2復元;146万年にわたる大気中CO2の連続プロキシ記録2021

    • Author(s)
      山本正伸,スティーブ・クレメンス,関宰,土屋優子,ヨンソン・フアン,大石龍太, 阿部彩子
    • Organizer
      第7回地球環境史学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 縄文時代以降の気候変化が北海道の狩猟漁撈最終文化に与えた影響2021

    • Author(s)
      山本正伸・櫻井弘道・関宰
    • Organizer
      令和3年度日本地質学会北海道支部例会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 北極海の完新世変動の解明をめざして2021

    • Author(s)
      HAPPIチーム・山本正伸
    • Organizer
      第7回地球環境史学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 鮮新世中期の温暖期におけるスコシア海の海面温度の復元2021

    • Author(s)
      石井花菜,関宰,山本正伸,マイケル・E・ウィーバー,マウリーン・E・レイモ,ビクトリア・L・ペック,ウィリアムズ・トレバー,IODP Expedition 382 研究者
    • Organizer
      第7回地球環境史学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 最終氷期末におけるパプアニューギニアの千年規模気候変動2021

    • Author(s)
      須藤樂,山本 正伸,後藤大貴,ボバ,サマンサ,ローゼンタール・ヤイール
    • Organizer
      第7回地球環境史学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Use of leaf wax carbon isotopes in Bay of Bengal sediments for paleo-CO2 reconstruction; A new continuous 1.46-million-year proxy record of atmospheric CO2.2021

    • Author(s)
      Yamamoto, M., Clemens, S., Seki, O., Tsuchiya, Y., Huang, Y., O’ishi, R., Abe-Ouchi, A.
    • Organizer
      American Geophysical Union, Fall Meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 微粒炭および燃焼起源化合物を用いた過去の火災イベントの復元2021

    • Author(s)
      山本正伸
    • Organizer
      第35回考古学研究会東海例会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 堆積物に残留する真核生物 DNAからみた1970年以降の 別府湾環境の変化2021

    • Author(s)
      山本正伸・瀬川雄大 鈴木仁・鈴木光次・加三千宣
    • Organizer
      シンポジウム「人新世国際標準模式地認定に向けた別府湾での取り組み」
    • Related Report
      2020 Annual Research Report
  • [Presentation] 堆積相・酸素同位体層序に基づく北東インド洋 IODP U1445 地点の堆積環境2020

    • Author(s)
      入野 智久・山本 正伸・Giosan L.・Clemens S.
    • Organizer
      第六回地球環境史学会年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Depositional environment at IODP Site U1445 in the northeastern Indian Ocean based on the litho- and isotope-stratigraphy,2020

    • Author(s)
      Irino, T., Yamamoto, M., Giosan, L., and Clemens, S.
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Pleistocene Water Isotope Reconstructions from the Indian Monsoon Region2020

    • Author(s)
      Clemens, S., Yamamoto,M., McGrath, S., Thirumalai, K., Huang, Y., Kerr, K., Richey, J., Rosenthal, Y.
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] The Western Pacific Warm Pool hydrology during the last 1.68 million years2020

    • Author(s)
      Yamamoto, M., Kikuchi, S., Yamamoto, Y., Bova, S., Rosenthal, Y.
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 水月湖堆積物コアの多環芳香族炭化水素及び五環性トリテルペノイドメチルエーテル類に残された過去700年間人間活動の記録2020

    • Author(s)
      稲垣 征哉、中村 英人、山本 正伸、中川 毅
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Tropical western Pacific hydrology during the last 6000 years based on charcoal records from Borneo2020

    • Author(s)
      Yamamoto, M., Kikuchi , T., Sakurai , H., Hayashi, R., Seki, O., Omori, T., Sulaiman, A., Shaari , H., Melling, L.
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Sedimentary soil organic matter records of the Indian Summer Monsoon variability during the last 1,460, 000 years.2020

    • Author(s)
      Yamamoto, M. & Clemens, S.
    • Organizer
      American Geophysical Union, Chapman Conference on the Evolution of the Monsoon, Biosphere and Mountain Building in Cenozoic Asia, Washington, D.C.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reconstruction of atmospheric pCO2 during the Plio-Pleistocene2019

    • Author(s)
      Seki, O., Irino, T., Horikawa, K., Okazaki, Y., & Abe-Ouchi, A, Jonaotaro Onodera,
    • Organizer
      AGU Fall Meeting 2019, San Francisco USA
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 過去146万年間の大気中二酸化炭素濃度の復元2019

    • Author(s)
      山本正伸・クレメンス,スティーブ・関宰・土屋優子・フアン,ヨンソン・大石龍太・阿部彩子
    • Organizer
      地球環境史学会年会(つくば市)
    • Related Report
      2019 Annual Research Report
  • [Presentation] GDGT proxies approach to the reconstruction of Indian summer monsoon variability during the last 1,460,000 years.2019

    • Author(s)
      Yamamoto, M., Clemens, S.
    • Organizer
      The International Meeting on Oragnic Geochemsitry, Gotenberg, Sweden,
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reconstruction of atmospheric CO2 concentration during the Plio-Pleistocene.2019

    • Author(s)
      Seki, O., Irino, T., Horikawa, K., Okazaki, Y., Abe-Ouchi, A., & Onodera, J.,
    • Organizer
      13th International Conference on Paleoceanography, Sydney Australia
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 長鎖脂肪酸炭素同位体比を用いた大気中二酸化炭素濃度復元2019

    • Author(s)
      山本正伸・クレメンス,スティーブ・関宰・土屋優子・フアン,ヨンソン・大石龍太・阿部彩子
    • Organizer
      第37回日本有機地球化学シンポジウム(金沢市)
    • Related Report
      2019 Annual Research Report
  • [Remarks] 過去600万年間にわたり大気中二酸化炭素濃度と気候の相互作用の解明

    • URL

      https://pablos.ees.hokudai.ac.jp/yamamoto/project/KakenSCO2.html

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
  • [Remarks] メインプロジェクト(過去600万年間のCO2濃度復元)

    • URL

      https://pablos.ees.hokudai.ac.jp/yamamoto/project/KakenSCO2.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 過去600万年間にわたる大気中二酸化炭素濃度と気候の相互作用の解明

    • URL

      https://pablos.ees.hokudai.ac.jp/yamamoto/project/KakenSCO2.html

    • Related Report
      2019 Annual Research Report

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Published: 2019-06-27   Modified: 2025-02-04  

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