Development of a technology to continuously scan cluster strength of c-axis of ice crystals within ice cores with high spatial resolutions

• Project/Area Number: 15K12194
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: National Institute of Polar Research
• Principal Investigator: Fujita Shuji 国立極地研究所, 研究教育系, 准教授 (30250476)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 氷 / アイスコア / フィルン / 誘電率 / 誘電異方性 / 複屈折 / マイクロ波 / 結晶主軸方位 / 結晶主軸方位分布 / 連続計測 / 開放型共振器 / ファブリペロー共振器 / スキャン

Outline of Final Research Achievements

Purpose of this study was to develop and to accomplish a new method to measure strength of birefringence of microwave within ice cores continuously. I developed a system of open resonator of microwave, and evaluated dielectric permittivity of ice and ice cores at frequency range of 15 -20 GHz. I challenged to measure dielectric permittivity tensor of ice specimen with 75-mm thickness. This attempt was successful; I was able to measure it with a spatial resolution of ~30mm. In the light of the purpose of this study, it was truly a breakthrough. Because of accomplishment of this technology, we are now able to innovate understanding for processes of metamorphism and deformation of snow, firn and ice in polar ice sheets.

Research Products

• [Journal Article] State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modelling (2017)
  • Author(s): Kawamura K, Abe-Ouchi A, (以下62名)
  • Journal Title: Science Advances Volume: 3 Issue: 2 Pages: 1-13
  • DOI: 10.1126/sciadv.1600446
  • NAID: 120005981371
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A Firn Densification Process in the High Accumulation Dome of Southeastern Greenland (2016)
  • Author(s): Iizuka, Y., Miyamoto, A., Hori, A., Matoba, S., Furukawa, R., Saito, T., Fujita, S, Hirabayashi, M, Yamaguchi, S, Fujita, K, Takeuchi, N.
  • Journal Title: Arctic Antarctic and Alpine Research Volume: 49(1) Issue: 1 Pages: 13-27
  • DOI: 10.1657/aaar0016-034
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Climate dependent contrast in surface mass balance in East Antarctica over the past 216 ka. (2016)
  • Author(s): Parrenin F, Fujita S, Abe-Ouchi A,(川村4番目,齋藤7番目,他6人)
  • Journal Title: Journal of Glaciology Volume: 62 Issue: 236 Pages: 1037-1048
  • DOI: 10.1017/jog.2016.85
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Physicochemical properties of bottom ice from Dome Fuji, inland East Antarctica (2016)
  • Author(s): Ohno, H., Iizuka, Y., Hori, A., Miyamoto, A., Hirabayashi, M., Miyake, T., Kuramoto, T., Fujita, S., Segawa, T., Uemura, R., Sakurai, T., Suzuki, T., and Motoyama, H
  • Journal Title: Journal of Geophysical Research: Earth Surface Volume: 121 Issue: 7 Pages: 1230-1250
  • DOI: 10.1002/2015jf003777
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Densification of layered firn of the ice sheet at Dome Fuji, Antarctica (2016)
  • Author(s): Shuji Fujita, Kumiko Goto-Azuma, Motohiro Hirabayashi, Akira Hori, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama and Kazuya Takahashi
  • Journal Title: Journal of Glaciology Volume: 該当なし Issue: 231 Pages: 1-26
  • DOI: 10.1017/jog.2016.16
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Acquisition of isotopic composition for surface snow in east antarctica and the links to climatic parameters (2016)
  • Author(s): Touzeau, A., Landais, A., Stenni, B., Uemura, R., Fukui, K., Fujita, S., Guilbaud, S., Ekaykin, A., Casado, M., Barkan, E., Luz, B., Magand, O., Teste, G., Le Meur, E., Baroni, M., Savarino, J., Bourgeois, I., and Risi, C.
  • Journal Title: The Cryosphere Volume: 10 Issue: 2 Pages: 837-852
  • DOI: 10.5194/tc-10-837-2016
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multiple 10Be records revealing the history of cosmic-ray variations across the Iceland Basin excursion (2016)
  • Author(s): Kazuho Horiuchi, Kanae Kamata, Shun Maejima, Sho Sasaki, Nobuyoshi Sasaki, Toshitsugu Yamazaki, Shuji Fujita, Hideaki Motoyama, Hiroyuki Matsuzaki
  • Journal Title: Earth and Planetary Science Letters Volume: 445 Pages: 105-114
  • DOI: 10.1016/j.epsl.2016.01.034
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Volcanic synchronization of Dome Fuji and Dome C Antarctic deep ice cores over the past 216 kyr (2015)
  • Author(s): S. Fujita, F. Parrenin, M. Severi, H. Motoyama, E. Wolff
  • Journal Title: Climate of the Past Volume: 11 Issue: 10 Pages: 1395-1426
  • DOI: 10.5194/cp-11-1395-2015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the occurrence of annual layers in Dome Fuji ice core early holocene ice (2015)
  • Author(s): Svensson, A., Fujita, S., Bigler, M., Braun, M., Dallmayr, R., Gkinis, V., Goto-Azuma, K., Hirabayashi, M., Kawamura, K., Kipfstuhl, S., Kjaer, H. A., Popp, T., Simonsen, M., Steffensen, J. P., Vallelonga, P., and Vinther, B. M.
  • Journal Title: Climate of the Past Volume: 11 Issue: 9 Pages: 1127-1137
  • DOI: 10.5194/cp-11-1127-2015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 厚いアイスコアを用いたC 軸集中度の連続計測手法 (2017)
  • Author(s): 藤田秀二
  • Organizer: 国立極地研究所 共同研究集会「南極ドームふじ氷床深層アイスコアの解析による気候・環境変動の研究」
  • Place of Presentation: 国立極地研究所
  • Year and Date: 2017-03-19
• [Presentation] Metamorphism of layered firn at Dome Fuji, Antarctica: Evolution of relations between Near-infrared reflectivity and the other textural/chemical properties (2016)
  • Author(s): Shuji Fujita, Kumiko Goto-Azuma, Hiroyuki Enomoto, Kotaro Fukui, Motohiro Hirabayashi, Akira Hori, Yu Hoshina, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama, Fumio Nakazawa, Shin Sugiyama, Sylviane Surdyk, Kazuya Takahashi
  • Organizer: The Seventh Symposium on Polar Science
  • Place of Presentation: 国立国語研究所 講堂
  • Year and Date: 2016-11-29
  • Int'l Joint Research
• [Presentation] Evolution processes of the firn structure in polar ice sheets based on analyses of dielectric anisotropy - latest results of analyses for Greenland SE core as a central topic - (2016)
  • Author(s): Shuji Fujita(NIPR, SOKENDAI), Yoshinori Iizuka(ILTS), Sumito Matoba(ILTS), Atsushi Miyamoto(Hokkaido Univ.) and Takeshi Saito(ILTS)
  • Organizer: The Seventh Symposium on Polar Science
  • Place of Presentation: 国立国語研究所 講堂
  • Year and Date: 2016-11-29
  • Int'l Joint Research
• [Presentation] 誘電異方性解析からみえた、極域氷床のフィルン構造の発達過程 ～グリーンランドSEコアの最新の解析結果を中心に～ (2016)
  • Author(s): 藤田秀二（国立極地研究所，総合研究大学院大学），飯塚芳徳（北海道大学低温科学研究所），的場澄人（北海道大学低温科学研究所），宮本淳（北海道大学高等教育推進機構），斎藤健（北海道大学低温科学研究所）
  • Organizer: 雪氷研究大会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2016-10-01
• [Presentation] Metamorphism of layered firn at Dome Fuji, Antarctica: Evolution of relations between Near-infrared reflectivity and the other textural/chemical properties (2016)
  • Author(s): Shuji Fujita, Kumiko Goto-Azuma, Hiroyuki Enomoto, Kotaro Fukui, Motohiro Hirabayashi, Akira Hori, Yu Hoshina, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama, Fumio Nakazawa, Shin Sugiyama, Sylviane Surdyk, Kazuya Takahashi
  • Organizer: SCAR 2016 Open Science Conference (OSC)
  • Place of Presentation: Kuala Lumpur, Malaysia
  • Year and Date: 2016-08-25
  • Int'l Joint Research
• [Presentation] 南極ドームふじのでのフィルン層構造の変態： 近赤外光の反射率と他の結晶組 織構造や化学特性との関係の発達 (2016)
  • Author(s): 藤田秀二
  • Organizer: 国立極地研究所研究集会「研究集会「両極域における第四紀の気候・環境変動」」
  • Place of Presentation: 東京都立川市 国立極地研究所
  • Year and Date: 2016-03-30
• [Presentation] 南極内陸ドームふじ次期氷床深層アイスコア掘削計画での「最古の氷」掘削地点の選定 (2016)
  • Author(s): 藤田秀二
  • Organizer: 国立極地研究所研究集会「研究集会「両極域における第四紀の気候・環境変動」」
  • Place of Presentation: 東京都立川市 国立極地研究所
  • Year and Date: 2016-03-30
• [Presentation] Glaciological conditions of the ice sheet at Dome Fuji, Dronning Maud Land, East Antarctica (2016)
  • Author(s): Shuji Fujita, Kumiko Goto - Azuma, Kenji Kawamura and Hideaki Motoyama
  • Organizer: The International Partnerships in Ice Core Sciences (IPICS) Second Open Science Conference
  • Place of Presentation: オーストラリア国ホバート
  • Year and Date: 2016-03-11
  • Int'l Joint Research
• [Presentation] Volcanic synchronization of Dome Fuji and Dome C Antarctic deep ice cores over the past 216 kyr (2016)
  • Author(s): S. Fujita, F. Parrenin, M. Severi, H. Motoyama, E. Wolff
  • Organizer: The International Partnerships in Ice Core Sciences (IPICS) Second Open Science Conference
  • Place of Presentation: オーストラリア国ホバート
  • Year and Date: 2016-03-07
  • Int'l Joint Research
• [Presentation] Densification of layered firn of the ice sheet at Dome Fuji, Antarctica (2016)
  • Author(s): Shuji Fujita, Kumiko Goto-Azuma, Motohiro Hirabayashi, Akira Hori, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama and Kazuya Takahashi
  • Organizer: The International Partnerships in Ice Core Sciences (IPICS) Second Open Science Conference
  • Place of Presentation: オーストラリア国ホバート
  • Year and Date: 2016-03-07
  • Int'l Joint Research
• [Presentation] Recent progress in understanding densification phenomena of polar firn: textural effects and some soluble impurities control creep deformation (2015)
  • Author(s): Shuji Fujita
  • Organizer: ILTS International Symposium on Low Temperature Science
  • Place of Presentation: 北海道大学 低温科学研究所
  • Year and Date: 2015-12-01
  • Int'l Joint Research / Invited
• [Presentation] Phasing between Deuterium records at Dome Fuji and Dome C in Antarctica over the past 216 kyr (2015)
  • Author(s): S. Fujita, F. Parrenin, M. Severi, H. Motoyama, E. Wolff
  • Organizer: The 6th Symposium on Polar Scince
  • Place of Presentation: 東京都立川市 国立極地研究所
  • Year and Date: 2015-11-17
  • Int'l Joint Research
• [Presentation] Densification of layered firn of the ice sheet at Dome Fuji, Antarctica (2015)
  • Author(s): Shuji Fujita, Kumiko Goto-Azuma, Motohiro Hirabayashi, Akira Hori, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama and Kazuya Takahashi
  • Organizer: The 6th Symposium on Polar Scince
  • Place of Presentation: 東京都立川市 国立極地研究所
  • Year and Date: 2015-11-16
  • Int'l Joint Research
• [Presentation] Volcanic synchronization of Dome Fuji and Dome C Antarctic deep ice cores over the past 216 kyr (2015)
  • Author(s): S. Fujita, F. Parrenin, M. Severi, H. Motoyama, E. Wolff
  • Organizer: The 6th Symposium on Polar Scince
  • Place of Presentation: 東京都立川市 国立極地研究所
  • Year and Date: 2015-11-16
  • Int'l Joint Research
• [Presentation] 南極ドームふじコアとドームCコア間の過去21万6千年間の火山同期 (2015)
  • Author(s): S. Fujita, F. Parrenin, M. Severi, H. Motoyama, E. Wolff
  • Organizer: 日本地球惑星科学連合 2015年大会
  • Place of Presentation: 千葉県幕張市 幕張メッセ国際会議場
  • Year and Date: 2015-05-25
  • Invited
• [Presentation] 南極ドームふじにおける氷床の層位をもったフィルンの圧密 (2015)
  • Author(s): 藤田秀二
  • Organizer: 日本地球惑星科学連合 2015年大会
  • Place of Presentation: 千葉県幕張市 幕張メッセ国際会議場
  • Year and Date: 2015-05-25