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Past climatic instabilities from high-resolution analyses of methane concentration in an Antarctic ice core

Research Project

Project/Area Number 20H00639
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 63:Environmental analyses and evaluation and related fields
Research InstitutionNational Institute of Polar Research

Principal Investigator

川村 賢二  国立極地研究所, 先端研究推進系, 准教授 (90431478)

Co-Investigator(Kenkyū-buntansha) 大藪 幾美  国立極地研究所, 先端研究推進系, 特任研究員 (20758396)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2023: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2022: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥21,840,000 (Direct Cost: ¥16,800,000、Indirect Cost: ¥5,040,000)
Keywords気候の不安定性 / 急激な気候変動 / 南極ドームふじ氷床コア / メタン / ダンスガード・オシュガー振動 / 南極氷床コア / アイスコア / ドームふじ / バイポーラー・シーソー / 氷期・間氷期
Outline of Research at the Start

これまでの南極ドームふじ氷床コアの分析結果から、気候の不安定性を南極と南半球中緯度の気候変動から論じた。一方、氷床コアの連続融解法によるメタン濃度分析手法を確立した。これらの成果を発展させ、ドームふじコアのメタン濃度を高精度かつ連続的に分析することで、未解明であった最終氷期より前の時代における北半球の気候変動シグナルを、南極氷床コアに見出す。これと北半球の海底堆積物コアや石筍などの解析データとの年代を統合し、ドームふじコアの気温の指標とも合わせて解析することを通じて、南北シーソーを伴う北半球の急激な気候変動の程度や頻度、地理的広がり、および平均気候状態との関係を解明する。

Outline of Annual Research Achievements

・連続融解法によるドームふじ氷床コアの分析
未だ世界的にも分析例の存在しない最終氷期より古い時代を対象として、南極ドームふじ氷床コアの分析を推進した。具体的には、最終氷期の海洋同位体ステージ3(氷期の中間的な気候)と比較研究するために、前々回の氷期(海洋同位体ステージ6)の5万年弱の期間を選定した。本分析結果には、従来の個別試料の分析結果には見られない突然の気候変動を示唆するシグナルが多数見られ、それらは最終氷期のダンスガード・オシュガー振動と類似した変動パターンであると推定したが、一方で、最終氷期のイベントと比較して短期間かつ振幅が小さい変動が多いといった違いも見られた。

・連続融解メタン分析手法の検証と改良
超純水と標準ガスを用いたメタン濃度のキャリブレーションについては、複数のコアや深度の試料を用いてCFAデータと個別試料の分析データを比較した結果、キャリブレーション後の濃度が個別試料分析の値より約4%低く出ることと、この過小評価の度合いが場合により変化することを発見した。キャリブレーションに用いる超純水を冷やす試みを行ったところ、補正後のデータが個別試料の値に近づいたことから、原因の一部は水の温度にあることが推察された。また、アイスコアの空気含有状態(気泡、ハイドレート)や圧力も関係ある可能性があることから、異なるコアの分析により今後検討が必要である。また、ドームふじコアの大深部の分析に向けたメタン濃度計測器の導入の検討を行った。そのため、新たな装置の導入を進めている海外の共同研究者からの関連情報の収集と議論を行った。

Current Status of Research Progress
Current Status of Research Progress

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

Reason

概要で述べたように、試験や実試料の分析が順調に進んでおり、前々回の氷期における突然の気候変動の様相を詳細に把握できるデータを得ることができた。また、深度分解能をさらに高めるための測器については、共同研究者の経験を踏まえて慎重に検討すべく情報収集を行っているなど、進展している。

Strategy for Future Research Activity

ドームふじコアの分析については、2500mより深い深度の分析を行い、古い時代の氷期と間氷期の一部について、分析手法の限界の評価と古環境変動の復元を目的としたデータを取得する。また、連続融解メタン分析手法の改良については、ドームふじコアの深部の分析データと同深度範囲の個別試料分析を実施し比較することや、分解能の高い測器の導入に向けた調査と検討を行う。

Report

(4 results)
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report

Research Products

(51 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (3 results) Journal Article (16 results) (of which Int'l Joint Research: 13 results,  Peer Reviewed: 15 results,  Open Access: 15 results) Presentation (31 results) (of which Int'l Joint Research: 24 results,  Invited: 1 results) Book (1 results)

  • [Int'l Joint Research] ケンブリッジ大学(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] オレゴン州立大学(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] オレゴン州立大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica2023

    • Author(s)
      Oyabu Ikumi、Kawamura Kenji、Fujita Shuji、Inoue Ryo、Motoyama Hideaki、Fukui Kotaro、Hirabayashi Motohiro、Hoshina Yu、Kurita Naoyuki、Nakazawa Fumio、Ohno Hiroshi、Sugiura Konosuke、Suzuki Toshitaka、Tsutaki Shun、Abe-Ouchi Ayako、Niwano Masashi、Parrenin Frederic、Saito Fuyuki、Yoshimori Masakazu
    • Journal Title

      Climate of the Past

      Volume: 19 Issue: 2 Pages: 293-321

    • DOI

      10.5194/cp-19-293-2023

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Towards reconstructing the Arctic atmospheric methane history over the 20th century: measurement and modelling results for the North Greenland Ice Core Project firn2022

    • Author(s)
      Umezawa Taku、Sugawara Satoshi、Kawamura Kenji、Oyabu Ikumi、Andrews Stephen J.、Saito Takuya、Aoki Shuji、Nakazawa Takakiyo
    • Journal Title

      Atmospheric Chemistry and Physics

      Volume: 22 Issue: 10 Pages: 6899-6917

    • DOI

      10.5194/acp-22-6899-2022

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dust correlation and oxygen isotope stratigraphy in the Southern Ocean over the last 450 kyrs: An Indian sector perspective2022

    • Author(s)
      Hiroki Matsui, Minoru Ikehara, Yusuke Suganuma, Osamu Seki, Ikumi Oyabu, Kenji Kawamura
    • Journal Title

      Quaternary Science Reviews

      Volume: 286 Pages: 107508-107508

    • DOI

      10.1016/j.quascirev.2022.107508

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Chronostratigraphy of the Larsen blue-ice area in northern Victoria Land, East Antarctica, and its implications for paleoclimate2022

    • Author(s)
      Lee Giyoon、Ahn Jinho、Ju Hyeontae、Ritterbusch Florian、Oyabu Ikumi、Buizert Christo、Kim Songyi、Moon Jangil、Ghosh Sambit、Kawamura Kenji、Lu Zheng-Tian、Hong Sangbum、Han Chang Hee、Hur Soon Do、Jiang Wei、Yang Guo-Min
    • Journal Title

      The Cryosphere

      Volume: 16 Issue: 6 Pages: 2301-2324

    • DOI

      10.5194/tc-16-2301-2022

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Gas isotope thermometry in the South Pole and Dome Fuji ice cores provides evidence for seasonal rectification of ice core gas records2022

    • Author(s)
      Morgan Jacob D.、Buizert Christo、Fudge Tyler J.、Kawamura Kenji、Severinghaus Jeffrey P.、Trudinger Cathy M.
    • Journal Title

      The Cryosphere

      Volume: 16 Issue: 7 Pages: 2947-2966

    • DOI

      10.5194/tc-16-2947-2022

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years2022

    • Author(s)
      Tsutaki Shun、Fujita Shuji、Kawamura Kenji、Abe-Ouchi Ayako、Fukui Kotaro、Motoyama Hideaki、Hoshina Yu、Nakazawa Fumio、Obase Takashi、Ohno Hiroshi、Oyabu Ikumi、Saito Fuyuki、Sugiura Konosuke、Suzuki Toshitaka
    • Journal Title

      The Cryosphere

      Volume: 16 Issue: 7 Pages: 2967-2983

    • DOI

      10.5194/tc-16-2967-2022

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Dome Fuji ice core DF2021 chronology (0-207 kyr BP)2022

    • Author(s)
      Oyabu Ikumi、Kawamura Kenji、Buizert Christo、Parrenin Frederic、Orsi Anais、Kitamura Kyotaro、Aoki Shuji、Nakazawa Takakiyo
    • Journal Title

      Quaternary Science Reviews

      Volume: 294 Pages: 107754-107754

    • DOI

      10.1016/j.quascirev.2022.107754

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spatial variations of 10Be in surface snow along the inland traverse route of Japanese Antarctic Research Expeditions2022

    • Author(s)
      Horiuchi Kazuho、Kato Shinji、Ohtani Kou、Kurita Naoyuki、Tsutaki Shun、Nakazawa Fumio、Motoyama Hideaki、Kawamura Kenji、Tazoe Hirofumi、Akata Naofumi、Yamagata Takeyasu、Matsuzaki Hiroyuki
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 533 Pages: 61-65

    • DOI

      10.1016/j.nimb.2022.10.018

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fractionation of O2/N2 and Ar/N2 in the Antarctic ice sheet during bubble formation and bubble-clathrate hydrate transition from precise gas measurements of the Dome Fuji ice core2021

    • Author(s)
      Oyabu, I., Kawamura, K., Uchida, T., Fujita, S., Kitamura, K., Hirabayashi, M., Aoki, S., Morimoto, S., Nakazawa, T., Severinghaus, J. P., and Morgan, J. D.
    • Journal Title

      The Cryosphere

      Volume: 15 Issue: 12 Pages: 5529-5555

    • DOI

      10.5194/tc-15-5529-2021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Antarctic surface temperature and elevation during the Last Glacial Maximum2021

    • Author(s)
      Christo Buizert, T. J. Fudge, William H. G. Roberts, Eric J. Steig, Sam Sherriff-Tadano, Catherine Ritz, Eric Lefebvre, Jon Edwards, Kenji Kawamura, Ikumi Oyabu, Hideaki Motoyama, 他(全42名)
    • Journal Title

      Science

      Volume: 372 (6546) Issue: 6546 Pages: 1097-1101

    • DOI

      10.1126/science.abd2897

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Surface Mass Balance Controlled by Local Surface Slope in Inland Antarctica: Implications for Ice‐Sheet Mass Balance and Oldest Ice Delineation in Dome Fuji2021

    • Author(s)
      Van Liefferinge B.、Taylor D.、Tsutaki S.、Fujita S.、Gogineni P.、Kawamura K.、Matsuoka K.、Moholdt G.、Oyabu I.、Abe‐Ouchi A.、Awasthi A.、Buizert C.、Gallet J.‐C.、Isaksson E.、Motoyama H.、Nakazawa F.、Ohno H.、O’Neill C.、Pattyn F.、Sugiura K.
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 24

    • DOI

      10.1029/2021gl094966

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean2021

    • Author(s)
      Oka Akira、Abe-Ouchi Ayako、Sherriff-Tadano Sam、Yokoyama Yusuke、Kawamura Kenji、Hasumi Hiroyasu
    • Journal Title

      Communications Earth and Environment

      Volume: 2 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s43247-021-00226-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy2021

    • Author(s)
      Uchida Tsutomu、Shigeyama Wataru、Oyabu Ikumi、Goto-Azuma Kumiko、Nakazawa Fumio、Homma Tomoyuki、Kawamura Kenji、Dahl-Jensen Dorthe
    • Journal Title

      Journal of Glaciology

      Volume: ー Issue: 269 Pages: 1-10

    • DOI

      10.1017/jog.2021.115

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chronostratigraphy of blue ice at the Larsen Glacier in Northern Victoria Land, East Antarctica2021

    • Author(s)
      Lee Giyoon、Ahn Jinho、Ju Hyeontae、Ritterbusch Florian、Oyabu Ikumi、Kim Songyi、Moon Jangil、Buizert Christo、Ghosh Sambit、Kawamura Kenji、Lu Zheng-Tian、Hong Sangbum、Han Chang Hee、Hur Soon Do、Jiang Wei、Yang Guo-Min
    • Journal Title

      The Cryosphere Discussions

      Volume: -

    • DOI

      10.5194/tc-2021-294

    • Related Report
      2021 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] New technique for high-precision, simultaneous measurements of CH<sub>4</sub>, N<sub>2</sub>O and CO<sub>2</sub> concentrations; isotopic and elemental ratios of N<sub>2</sub>, O<sub>2</sub> and Ar; and total air content in ice cores by wet extraction2020

    • Author(s)
      Oyabu Ikumi、Kawamura Kenji、Kitamura Kyotaro、Dallmayr Remi、Kitamura Akihiro、Sawada Chikako、Severinghaus Jeffrey P.、Beaudette Ross、Orsi Ana?s、Sugawara Satoshi、Ishidoya Shigeyuki、Dahl-Jensen Dorthe、Goto-Azuma Kumiko、Aoki Shuji、Nakazawa Takakiyo
    • Journal Title

      Atmospheric Measurement Techniques

      Volume: 13 Issue: 12 Pages: 6703-6731

    • DOI

      10.5194/amt-13-6703-2020

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Mobile, Multichannel, UWB Radar for Potential Ice Core Drill Site Identification in East Antarctica: Development and First Results2020

    • Author(s)
      Rodriguez-Morales Fernando、Braaten David、Trong Mai Hoang、Paden John、Gogineni Prasad、Yan Jie-Bang、Abe-Ouchi Ayako、Fujita Shuji、Kawamura Kenji、Tsutaki Shun、Van Liefferinge Brice、Matsuoka Kenichi、Steinhage Daniel
    • Journal Title

      IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

      Volume: 13 Pages: 4836-4847

    • DOI

      10.1109/jstars.2020.3016287

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Reconstruction of atmospheric methane concentration during the penultimate glacial period (145-195ka) from continuous flow analysis (CFA) of the Dome Fuji ice core2022

    • Author(s)
      Ayaka Yonekura, Kenji Kawamura, Ikumi Oyabu, Kyotaro Kitamura, Jun Ogata, Motohiro Hirabayashi, Kaori Fukuda, Yoshimi Tsukagawa, Tomotaka Saruya, Fumio Nakazawa, Shuji Fujita, Kumiko Goto-Azuma, Hideaki Motoyama
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Towards reconstructing the Arctic atmospheric methane history over the 20th century: measurement and modeling results for the NGRIP firn2022

    • Author(s)
      Taku Umezawa, Satoshi Sugawara, Kenji Kawamura, Ikumi Oyabu, Stephen Andrews, Takuya Saito, Shuji Aoki, Takakiyo Nakazawa
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 氷床コアのメタン濃度の連続融解分析からみた南極と北半球の気候変動のリンク2022

    • Author(s)
      川村賢二、大藪幾美、米倉綾香、 極地研CFAチーム(東久美子、藤田秀二、平林幹啓、中澤文男、 小室悠紀、猿谷友孝、尾形純、北村享太郎、福田かおり、塚川佳美
    • Organizer
      長期スケールの南極・南大洋変動に関する研究集会、札幌
    • Related Report
      2022 Annual Research Report
  • [Presentation] Methane concentration in the Dome Fuji ice core measured by a continuous flow analysis system: method and initial results from the LGM to Holocene2022

    • Author(s)
      Kenji Kawamura, Ayaka Yonekura, Ikumi Oyabu, Kyotaro Kitamura, Remi Dallmayr, Rachael Rhodes, Jun Ogata, Motohiro Hirabayashi, Kaori Fukuda, Kumiko Goto-Azuma, Hideaki Motoyama
    • Organizer
      IPICS Open Science Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Dome Fuji ice core DF2021 chronology (0-207 kyr BP)2022

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Christo Buizert, Frederic Parrenin, Anais Orsi, Kyotato Kitamura, Shuji Aoki, Takakiyo Nakazawa
    • Organizer
      IPICS 3rd Open Science Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Third Dome Fuji Deep Coring: an Oldest Ice Core2022

    • Author(s)
      Kenji Kawamura, on behalf of the Third Dome Fuji Project
    • Organizer
      13th Symposium on Polar Science
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Chronostratigraphy of Larsen blue ice, East Antarctica, and a tentative reconstruction of surface temperature and accumulation rate during the last deglaciation2022

    • Author(s)
      Giyoon Lee, Jinho Ahn, Hyeontae Joo, Florian Ritterbusch, Ikumi Oyabu, Songyi Kim, Kenji Kawamura, Zheng-Tian Lu, Sangyoung Han, Sambit Ghosh, Yeongcheol Han, Sangbum Hong, Changhee Han, Soon Do Hur, Wei Jiang, Guo-min Yang
    • Organizer
      IPICS 3rd Open Science Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fractionation of O2/N2 and Ar/N2 in the Antarctic ice sheet from precise gas measurements of the Dome Fuji ice core - Constraining permeabilities of O2, N2 and Ar in the ice sheet with a simple diffusion model-2022

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Tsutomu Uchida, Shuji Fujita, Kyotaro Kitamura, Motohiro Hirabayashi, Shuji Aoki, Shinji Morimoto, Takakiyo Nakazawa, Jeffrey P. Severinghaus, Jacob Morgan
    • Organizer
      IPICS 3rd Open Science Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Paleochrono probabilistic model to derive a consistent chronology for several paleoclimatic sites2022

    • Author(s)
      F. Parrenin, L. Bazin, C. Buizert, E. Capron, J. Chowdhry-Beeman, E. Corrick, R. Drysdale, K. Kawamura, A. Landais, R.Mulvaney, I. Oyabu, S. Rasmussen
    • Organizer
      IPICS 3rd Open Science Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Dome Fuji ice core DF2021 chronology (0-207 kyr BP)2022

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Christo Buizert, Frederic Parrenin, Anais Orsi, Kyotato Kitamura, Shuji Aoki, Takakiyo Nakazawa
    • Organizer
      13th Symposium on Polar Science
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Atmospheric CH4 concentration during the Holocene reconstructed from the NEEM (Greenland) and Dome Fuji (East Antarctica) ice cores2022

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Shinji Morimoto, Shuji Aoki, Kumiko Goto-Azuma and Thomas Blunier
    • Organizer
      ISAR-7
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Methane concentration in Dome Fuji ice core measured with a continuous flow analysis system2021

    • Author(s)
      Ayaka Yonekura, Kenji Kawamura, Ikumi Oyabu, Kyotaro Kitamura, Jun Ogata, Motohiro Hirabayashi, Kaori Fukuda, Yoshimi Tsukagawa, Tomotaka Saruya, Fumio Nakazawa, Shuji Fujita, Kumiko Goto-Azuma, Hideaki Motoyama
    • Organizer
      JpGU online meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fractionation of O2/N2 and Ar/N2 in polar ice cores during bubble formation, bubble-clathrate hydrate transition, and gas loss during storage from precise gas measurements of the Dome Fuji ice core, Antarctica2021

    • Author(s)
      Oyabu, I., Kawamura, K., Uchida, T., Fujita, S., Kitamura, K., Hirabayashi, M., Aoki, S., Morimoto, S., Nakazawa, T., Severinghaus, J. P., Morgan, J.
    • Organizer
      JpGU online meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Climatic and atmospheric changes over the last three Terminations from O2/N2, δ18Oatm and CH4 records of the Dome Fuji ice core, Antarctica2021

    • Author(s)
      Oyabu, I., K. Kawamura, K. Kitamura, A. Orsi, and F. Parrenin, Buizert, C.
    • Organizer
      JpGU online meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study of the formation of stratified firn on the snow surface near Dome Fuji, Antarctica, by multiple physicochemical analyses2021

    • Author(s)
      Ryo Inoue, Shuji Fujita, Kenji Kawamura, Jun Ogata, Motohiro Hirabayashi, Kaori Fukuda, Kyotaro Kitamura, Ayaka Yonekura, Kumiko Goto-Azuma, Fumio Nakazawa, Ikumi Oyabu, Hideaki Motoyama
    • Organizer
      JpGU online meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Assessing dust-magnetic correlation in the Indian sector of the Southern Ocean2021

    • Author(s)
      Matsui, H., Ikehara, M., Suganuma, Y., Seki, O., Oyabu, I., Kawamura, K.
    • Organizer
      JpGU online meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The new Kr-86 excess ice core proxy for synoptic activity:West Antarctic storminess possibly linked to ITCZ movement through the last deglaciation2021

    • Author(s)
      Christo Buizert, Sarah Shackleton, Jeffrey P. Severinghaus, William H. G. Roberts, Bernhard Bereiter, Kenji Kawamura, Daniel Baggenstos, Ana_s J. Orsi, Ikumi Oyabu, Benjamin Birner, Edward J. Brook, David M. Etheridge, Nancy Bertler, Rebecca L. Pyne, Robert Mulvaney, and Ellen Mosley-Thompson
    • Organizer
      EGU General Assembly
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preliminary results for stratigraphy and chronology of blue ice in Larsen Glacier, East Antarctica2021

    • Author(s)
      Giyoon Lee, Jinho Ahn, Hyeontae Joo, Florian Ritterbusch, Ikumi Oyabu, Songyi Kim, Kenji Kawamura, Zheng-Tian Lu, Sangyoung Han, Sambit Ghosh, Yeongcheol Han, Sangbum Hong, Changhee Han, Soon Do Hur, Wei Jiang, Guomin Yang
    • Organizer
      EGU General Assembly
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Paleochrono probabilistic model to derive a consistent chronology for several paleoclimatic sites2021

    • Author(s)
      F. Parrenin, L. Bazin, C. Buizert, E. Capron, J. Chowdhry-Beeman, E. Corrick, R. Drysdale, K. Kawamura, A. Landais, R. Mulvaney, I. Oyabu, S. Rasmussen
    • Organizer
      EGU General Assembly
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ドームふじアイスコアの連続分析により得られた約15 万年前の氷期におけるメタン濃度変動2021

    • Author(s)
      米倉綾香,川村賢二,大藪幾美, 北村享太郎,尾形純,平林幹啓,福田かおり,塚川佳美,猿谷友孝,中澤文男,藤田秀二,東久美子,本山秀明
    • Organizer
      雪氷研究大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ドームふじ氷床コアにおけるO2/N2 とAr/N2の分別2021

    • Author(s)
      大藪幾美,川村賢二,内田努,藤田秀二,北村享太郎,平林幹啓,青木周司,森本真司,中澤高清
    • Organizer
      雪氷研究大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] アイスコアの気体や微粒子の解析に基づく気候変動の研究2021

    • Author(s)
      大藪幾美、川村賢二、飯塚芳徳、北村享太郎、Margareta Hansson、Eric Wolff、Mirko Severi、大垣内るみ、阿部彩子、Remi Dallmayr、北村 明弘、沢田近子、Jeffrey P. Severinghaus、Ross Beaudette、Anais Orsi、菅原敏、石戸谷重之、Dorthe Dahl-Jensen、東久美子、青木周司、中澤高清
    • Organizer
      日本地球化学会年会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Fractionation of O2/N2 and Ar/N2 in the Antarctic ice sheet from precise gas measurements of the Dome Fuji ice core -Constraining permeabilities of O2, N2 and Ar in the ice sheet with a simple diffusion model2021

    • Author(s)
      Oyabu, I., Kawamura, K., Uchida, T., Fujita, S., Kitamura, K., Hirabayashi, M., Aoki, S., Morimoto, S., Nakazawa, T., Severinghaus, J. P., Morgan, J
    • Organizer
      12th Symposium on Polar Science
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Collaborative studies for locating the oldest ice near Dome Fuji, Antarctica2020

    • Author(s)
      K. Kawamura, A. Abe-Ouchi, S. Fujita, P. Gogineni, D. Braaten, J-C Gallet, K. Goto-Azuma, R. Greve, E. Isaksson, B. van Liefferinge, K. Matsuoka, H. Motoyama, F. Nakazawa, T. Obase, H. Ohno, I. Oyabu, J. Paden, F. Rodriguez-Morales, F. SAITO, R. A. Taylor, S. Tsutaki,
    • Organizer
      JpGU
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Accurate chronology and climatic reconstruction around MIS 11 from the Dome Fuji ice core2020

    • Author(s)
      Kenji Kawamura, Ikumi Oyabu, Shuji Aoki, Takakiyo Nakazawa, Ayako Abe-Ouchi, Fuyuki SAITO
    • Organizer
      JpGU
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Compositions of dust and sea salts in the Dome C and Dome Fuji ice cores from Last Glacial Maximum to early Holocene based on ice-sublimation and single-particle measurements2020

    • Author(s)
      Ikumi Oyabu, Yoshinori Iizuka, Kenji Kawamura, Eric Wolff, Mirko Severi, Rumi Ohgaito, Ayako Abe-Ouchi, Margareta Hansson
    • Organizer
      JpGU
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Revising the Dome Fuji ice core chronology2020

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Frederic Parrenin, Anais Orsi, Christo Buizert
    • Organizer
      JpGU
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 連続融解分析法によるドームふじアイスコア中のメタン濃度の測定 -最終氷期最寒期から完新世-2020

    • Author(s)
      米倉綾香,川村賢二,大藪幾美,北村享太郎,尾形純,平林幹啓,福田かおり,東久美子,本山秀明
    • Organizer
      雪氷研究大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Impact of density and microstructure on bubble close-off in layered firn at a new site near Dome Fuji, East Antarctica2020

    • Author(s)
      Ryo Inoue, Shuji Fujita, Kenji Kawamura, Fumio Nakazawa, Ikumi Oyabu
    • Organizer
      11th Symposium on Polar Science
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fractionation of O2/N2 and Ar/N2 in polar ice cores during bubble formation, bubble-clathrate transition, and gas loss during storage from precise gas measurements of the Dome Fuji ice core, Antarctica2020

    • Author(s)
      Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Shuji Fujita, Tsutomu Uchida, Jeffery P. Severinghaus, Jacob Morgan, Motohiro Hirabayashi
    • Organizer
      11th Symposium on Polar Science
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Continuous methane measurement by a Continuous Flow Analysis system2020

    • Author(s)
      Ayaka Yonekura, Kenji Kawamura, Ikumi Oyabu, Kyotaro Kitamura, Jun Ogata, Motohiro Hirabayashi, Kaori Fukuda, Kumiko Goto-Azuma, Hieaki Motoyama
    • Organizer
      11th Symposium on Polar Science
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Book] ダイナミックな地球 (改訂版)2021

    • Author(s)
      大森聡一、川村賢二、細田滋毅、山崎晴雄、横井覚
    • Total Pages
      296
    • Publisher
      放送大学教育振興会
    • ISBN
      9784595322860
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2023-12-25  

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