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

• Project/Area Number: 20H00639
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 63:Environmental analyses and evaluation and related fields
• Research Institution: National 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: ¥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

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。

Research Products

• [Int'l Joint Research] ケンブリッジ大学(英国)
• [Int'l Joint Research] オレゴン州立大学(米国)
• [Int'l Joint Research] オレゴン州立大学(米国)
• [Journal Article] Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica (2023)
  • 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
  • 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 firn (2022)
  • 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
  • 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 perspective (2022)
  • 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
  • Peer Reviewed
• [Journal Article] Chronostratigraphy of the Larsen blue-ice area in northern Victoria Land, East Antarctica, and its implications for paleoclimate (2022)
  • 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
  • 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 records (2022)
  • 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
  • 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 years (2022)
  • 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
  • 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
  • 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 Expeditions (2022)
  • 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
  • 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 core (2021)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Antarctic surface temperature and elevation during the Last Glacial Maximum (2021)
  • 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
  • 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 Fuji (2021)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean (2021)
  • 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
  • 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 spectroscopy (2021)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Chronostratigraphy of blue ice at the Larsen Glacier in Northern Victoria Land, East Antarctica (2021)
  • 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
  • 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 extraction (2020)
  • 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
  • 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 Results (2020)
  • 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
  • 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 core (2022)
  • 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
• [Presentation] Towards reconstructing the Arctic atmospheric methane history over the 20th century: measurement and modeling results for the NGRIP firn (2022)
  • 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
• [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
• [Presentation] Methane concentration in the Dome Fuji ice core measured by a continuous flow analysis system: method and initial results from the LGM to Holocene (2022)
  • 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
  • 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
  • Int'l Joint Research
• [Presentation] Third Dome Fuji Deep Coring: an Oldest Ice Core (2022)
  • Author(s): Kenji Kawamura, on behalf of the Third Dome Fuji Project
  • Organizer: 13th Symposium on Polar Science
  • 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 deglaciation (2022)
  • 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
  • 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
  • Int'l Joint Research
• [Presentation] The Paleochrono probabilistic model to derive a consistent chronology for several paleoclimatic sites (2022)
  • 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
  • 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
  • Int'l Joint Research
• [Presentation] Atmospheric CH4 concentration during the Holocene reconstructed from the NEEM (Greenland) and Dome Fuji (East Antarctica) ice cores (2022)
  • Author(s): Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Shinji Morimoto, Shuji Aoki, Kumiko Goto-Azuma and Thomas Blunier
  • Organizer: ISAR-7
  • Int'l Joint Research
• [Presentation] Methane concentration in Dome Fuji ice core measured with a continuous flow analysis system (2021)
  • 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
  • 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, Antarctica (2021)
  • 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
  • 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, Antarctica (2021)
  • Author(s): Oyabu, I., K. Kawamura, K. Kitamura, A. Orsi, and F. Parrenin, Buizert, C.
  • Organizer: JpGU online meeting
  • Int'l Joint Research
• [Presentation] Study of the formation of stratified firn on the snow surface near Dome Fuji, Antarctica, by multiple physicochemical analyses (2021)
  • 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
  • Int'l Joint Research
• [Presentation] Assessing dust-magnetic correlation in the Indian sector of the Southern Ocean (2021)
  • Author(s): Matsui, H., Ikehara, M., Suganuma, Y., Seki, O., Oyabu, I., Kawamura, K.
  • Organizer: JpGU online meeting
  • 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 deglaciation (2021)
  • 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
  • Int'l Joint Research
• [Presentation] Preliminary results for stratigraphy and chronology of blue ice in Larsen Glacier, East Antarctica (2021)
  • 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
  • Int'l Joint Research
• [Presentation] The Paleochrono probabilistic model to derive a consistent chronology for several paleoclimatic sites (2021)
  • 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
  • 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
• [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
• [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
  • 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 model (2021)
  • 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
  • Int'l Joint Research
• [Presentation] Collaborative studies for locating the oldest ice near Dome Fuji, Antarctica (2020)
  • 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
  • Int'l Joint Research
• [Presentation] Accurate chronology and climatic reconstruction around MIS 11 from the Dome Fuji ice core (2020)
  • Author(s): Kenji Kawamura, Ikumi Oyabu, Shuji Aoki, Takakiyo Nakazawa, Ayako Abe-Ouchi, Fuyuki SAITO
  • Organizer: JpGU
  • 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 measurements (2020)
  • Author(s): Ikumi Oyabu, Yoshinori Iizuka, Kenji Kawamura, Eric Wolff, Mirko Severi, Rumi Ohgaito, Ayako Abe-Ouchi, Margareta Hansson
  • Organizer: JpGU
  • Int'l Joint Research
• [Presentation] Revising the Dome Fuji ice core chronology (2020)
  • Author(s): Ikumi Oyabu, Kenji Kawamura, Kyotaro Kitamura, Frederic Parrenin, Anais Orsi, Christo Buizert
  • Organizer: JpGU
  • 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
• [Presentation] Impact of density and microstructure on bubble close-off in layered firn at a new site near Dome Fuji, East Antarctica (2020)
  • Author(s): Ryo Inoue, Shuji Fujita, Kenji Kawamura, Fumio Nakazawa, Ikumi Oyabu
  • Organizer: 11th Symposium on Polar Science
  • 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, Antarctica (2020)
  • 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
  • Int'l Joint Research
• [Presentation] Continuous methane measurement by a Continuous Flow Analysis system (2020)
  • 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
  • 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