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3. Shallow ice core drilling and preliminary analysis at South-East Dome, Greenland

Author

Iizuka, Yoshinori, Matoba, Sumito, Fujita, Shuji, Shinbori, Kunio, Yamasaki, Tetsuhisa, Miyamoto, Atsushi, Hori, Akira, Saito, Takeshi, Furukawa, Ryoto, Sugiyama, Shin, and Aoki, Teruo

Subjects
圧密氷化, 南東ドーム, アイスコア, グリーンランド氷床
Abstract

グリーンランドにおける高涵養量域の圧密氷化過程の特徴の解明や近年の人為起源エアロゾルの変遷の解読を目的として，2015 年5 月にグリーンランド南東ドームにおいて，90.45 m の浅層コア掘削を実施した．掘削地点はタシーラク（アンマサリック）から185 km 北に位置している（SE-Dome；67.18°N，36.37°W，3170 m a.s.l.）．掘削孔の氷温は20 m 深において－20.9℃であった．2015年8月にコアが日本に輸送され，低温科学研究所の低温室において密度測定や電気伝導度測定などの初期コア解析が行われた．その結果，SE-Dome コアの氷化深度は83-86 m，涵養量は約1.0 m w.e. yr－1 であった．SE-Dome コアは氷床のドームとしては最も高涵養量の地域の一つである．圧密氷化過程を調べたところ，750 kg m－3 以上の密度域において，SE-Dome コアは通常の涵養量地域の浅層コアよりも変形しやすい特徴を持つことが分かった．, In order to understand 1) temporal variations of anthropogenic aerosols from European regions under the Icelandic Low with high time resolution, and 2) the snow densification mechanism at a high accumulation dome in Greenland, we drilled a 90.45 m ice core in a high accumulation area of the southeastern Greenland Ice Sheet. The drilling site (SE-Dome; 67.18°N, 36.37°W, 3170 m a.s.l.) is located 185 km north of the town of Tasiilaq in southeastern Greenland. The ice temperature is -20.9℃ at 20 m depth, and the site has an average accumulation rate of 1.0 m w.e. yr-1 in water equivalent. The ice core exhibits distinct firn densification. The close-off density of 830 kg m-3 occurs at 83.4-86.8 m depth, which is about 20 m shallower than predicted from an empirical model. In the region where the density ρ＞750 kg m-3, the densification appears faster than according to the empirical model.

Published
2017

4. Deep ice core drilling to a depth of 3035.22 m at Dome Fuji, Antarctica in 2001–07.

Author

Motoyama, Hideaki, Takahashi, Akiyoshi, Tanaka, Yoichi, Shinbori, Kunio, Miyahara, Morihiro, Yoshimoto, Takayasu, Fujii, Yoshiyuki, Furusaki, Atsushi, Azuma, Nobuhiko, Ozawa, Yukio, Kobayashi, Akio, and Yoshise, Yasushi

Subjects
ICE cores, GLACIOLOGY, DATA analysis, DRILLING & boring, DOME Fuji Station (Antarctica)
Abstract

The Japanese second deep ice coring project was carried out at Dome Fuji, Antarctica. Following the drilling of the pilot hole in 2001, deep ice core drilling led by the Japanese Antarctic Research Expedition (JARE) was conducted over four austral summer seasons, beginning with the 2003/04 season and reached a depth of 3035.22 m near the bedrock in January 2007. The new drill was designed and developed with the goals of (1) solving the problems encountered during the first JARE deep coring drill and (2) achieving more efficient drilling. In particular, the maximum core length that can be drilled at one time was increased from 2.30 m to 3.84 m and the chip storage efficiency was enhanced by a special pipe with many small holes. This paper gives an outline of the improved drilling system, the progress of drilling and various drilling data. [ABSTRACT FROM AUTHOR]

Published
2021
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5. 次世代型液封深層掘削装置及び周辺機器の検討・開発 - JARE57中層掘削からのフィードバック

Author

Motoyama, Hideaki, Furusaki, Atsushi, Kawamura, Kenji, Sakurai, Toshimitsu, Matoba, Sumito, Shinbori, Kunio, Mori, Shoichi, Takata, Morimasa, Takahashi, Akiyoshi, Tanaka, Yoichi, Miyahara, Morihiro, Kobayashi, Akio, and Yoshise, Yasushi

Abstract

第7回極域科学シンポジウム/特別セッション：[S] 「南極地域観測第Ⅷ期から第Ⅸ期6か年計画に向けて」12月1日（木）国立極地研究所 1階交流アトリウム

Published
2016

6. State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling

Author

10225716, Kawamura, Kenji, Abe-Ouchi, Ayako, Motoyama, Hideaki, Ageta, Yutaka, Aoki, Shuji, Azuma, Nobuhiko, Fujii, Yoshiyuki, Fujita, Koji, Fujita, Shuji, Fukui, Kotaro, Furukawa, Teruo, Furusaki, Atsushi, Goto-Azuma, Kumiko, Greve, Ralf, Hirabayashi, Motohiro, Hondoh, Takeo, Hori, Akira, Horikawa, Shinichiro, Horiuchi, Kazuho, Igarashi, Makoto, Iizuka, Yoshinori, Kameda, Takao, Kanda, Hiroshi, Kohno, Mika, Kuramoto, Takayuki, Matsushi, Yuki, Miyahara, Morihiro, Miyake, Takayuki, Miyamoto, Atsushi, Nagashima, Yasuo, Nakayama, Yoshiki, Nakazawa, Takakiyo, Nakazawa, Fumio, Nishio, Fumihiko, Obinata, Ichio, Ohgaito, Rumi, Oka, Akira, Okuno, Jun’ichi, Okuyama, Junichi, Oyabu, Ikumi, Parrenin, Frédéric, Pattyn, Frank, Saito, Fuyuki, Saito, Takashi, Saito, Takeshi, Sakurai, Toshimitsu, Sasa, Kimikazu, Seddik, Hakime, Shibata, Yasuyuki, Shinbori, Kunio, Suzuki, Keisuke, Suzuki, Toshitaka, Takahashi, Akiyoshi, Takahashi, Kunio, Takahashi, Shuhei, Takata, Morimasa, Tanaka, Yoichi, Uemura, Ryu, Watanabe, Genta, Watanabe, Okitsugu, Yamasaki, Tetsuhide, Yokoyama, Kotaro, Yoshimori, Masakazu, Yoshimoto, Takayasu, 10225716, Kawamura, Kenji, Abe-Ouchi, Ayako, Motoyama, Hideaki, Ageta, Yutaka, Aoki, Shuji, Azuma, Nobuhiko, Fujii, Yoshiyuki, Fujita, Koji, Fujita, Shuji, Fukui, Kotaro, Furukawa, Teruo, Furusaki, Atsushi, Goto-Azuma, Kumiko, Greve, Ralf, Hirabayashi, Motohiro, Hondoh, Takeo, Hori, Akira, Horikawa, Shinichiro, Horiuchi, Kazuho, Igarashi, Makoto, Iizuka, Yoshinori, Kameda, Takao, Kanda, Hiroshi, Kohno, Mika, Kuramoto, Takayuki, Matsushi, Yuki, Miyahara, Morihiro, Miyake, Takayuki, Miyamoto, Atsushi, Nagashima, Yasuo, Nakayama, Yoshiki, Nakazawa, Takakiyo, Nakazawa, Fumio, Nishio, Fumihiko, Obinata, Ichio, Ohgaito, Rumi, Oka, Akira, Okuno, Jun’ichi, Okuyama, Junichi, Oyabu, Ikumi, Parrenin, Frédéric, Pattyn, Frank, Saito, Fuyuki, Saito, Takashi, Saito, Takeshi, Sakurai, Toshimitsu, Sasa, Kimikazu, Seddik, Hakime, Shibata, Yasuyuki, Shinbori, Kunio, Suzuki, Keisuke, Suzuki, Toshitaka, Takahashi, Akiyoshi, Takahashi, Kunio, Takahashi, Shuhei, Takata, Morimasa, Tanaka, Yoichi, Uemura, Ryu, Watanabe, Genta, Watanabe, Okitsugu, Yamasaki, Tetsuhide, Yokoyama, Kotaro, Yoshimori, Masakazu, and Yoshimoto, Takayasu

Abstract

Climatic variabilities on millennial and longer time scales with a bipolar seesaw pattern have been documented in paleoclimatic records, but their frequencies, relationships with mean climatic state, and mechanisms remain unclear. Understanding the processes and sensitivities that underlie these changes will underpin better understanding of the climate system and projections of its future change. We investigate the long-term characteristics of climatic variability using a new ice-core record from Dome Fuji, East Antarctica, combined with an existing long record from the Dome C ice core. Antarctic warming events over the past 720, 000 years are most frequent when the Antarctic temperature is slightly below average on orbital time scales, equivalent to an intermediate climate during glacial periods, whereas interglacial and fully glaciated climates are unfavourable for a millennial-scale bipolar seesaw. Numerical experiments using a fully coupled atmosphere-ocean general circulation model with freshwater hosing in the northern North Atlantic showed that climate becomes most unstable in intermediate glacial conditions associated with large changes in sea ice and the Atlantic Meridional Overturning Circulation. Model sensitivity experiments suggest that the prerequisite for the most frequent climate instability with bipolar seesaw pattern during the late Pleistocene era is associated with reduced atmospheric CO2 concentration via global cooling and sea ice formation in the North Atlantic, in addition to extended Northern Hemisphere ice sheets.

Published
2017

7. State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling

Author

Kawamura, Kenji, Abe-Ouchi, Ayako, Motoyama, Hideaki, Ageta, Yutaka, Aoki, Shuji, Azuma, Nobuhiko, Fujii, Yoshiyuki, Fujita, Koji, Fujita, Shuji, Fukui, Kotaro, Furukawa, Teruo, Furusaki, Atsushi, Goto-Azuma, Kumiko, Greve, Ralf, Hirabayashi, Motohiro, Hondoh, Takeo, Hori, Akira, Horikawa, Shinichiro, Horiuchi, Kazuho, Igarashi, Makoto, Iizuka, Yoshinori, Kameda, Takao, Kanda, Hiroshi, Kohno, Mika, Kuramoto, Takayuki, Matsushi, Yuki, Miyahara, Morihiro, Miyake, Takayuki, Miyamoto, Atsushi, Nagashima, Yasuo, Nakayama, Yoshiki, Nakazawa, Takakiyo, Nakazawa, Fumio, Nishio, Fumihiko, Obinata, Ichio, Ohgaito, Rumi, Oka, Akira, Okuno, Jun'ichi, Okuyama, Junichi, Oyabu, Ikumi, Parrenin, Frédéric, Pattyn, Frank, Saito, Fuyuki, Saito, Takashi, Saito, Takeshi, Sakurai, Toshimitsu, Sasa, Kimikazu, Seddik, Hakime, Shibata, Yasuyuki, Shinbori, Kunio, Suzuki, Keisuke, Suzuki, Toshitaka, Takahashi, Akiyoshi, Takahashi, Kunio, Takahashi, Shuhei, Takata, Morimasa, Tanaka, Yoichi, Uemura, Ryu, Watanabe, Genta, Watanabe, Okitsugu, Yamasaki, Tetsuhide, Yokoyama, Kotaro, Yoshimori, Masakazu, Yoshimoto, Takayasu, Kawamura, Kenji, Abe-Ouchi, Ayako, Motoyama, Hideaki, Ageta, Yutaka, Aoki, Shuji, Azuma, Nobuhiko, Fujii, Yoshiyuki, Fujita, Koji, Fujita, Shuji, Fukui, Kotaro, Furukawa, Teruo, Furusaki, Atsushi, Goto-Azuma, Kumiko, Greve, Ralf, Hirabayashi, Motohiro, Hondoh, Takeo, Hori, Akira, Horikawa, Shinichiro, Horiuchi, Kazuho, Igarashi, Makoto, Iizuka, Yoshinori, Kameda, Takao, Kanda, Hiroshi, Kohno, Mika, Kuramoto, Takayuki, Matsushi, Yuki, Miyahara, Morihiro, Miyake, Takayuki, Miyamoto, Atsushi, Nagashima, Yasuo, Nakayama, Yoshiki, Nakazawa, Takakiyo, Nakazawa, Fumio, Nishio, Fumihiko, Obinata, Ichio, Ohgaito, Rumi, Oka, Akira, Okuno, Jun'ichi, Okuyama, Junichi, Oyabu, Ikumi, Parrenin, Frédéric, Pattyn, Frank, Saito, Fuyuki, Saito, Takashi, Saito, Takeshi, Sakurai, Toshimitsu, Sasa, Kimikazu, Seddik, Hakime, Shibata, Yasuyuki, Shinbori, Kunio, Suzuki, Keisuke, Suzuki, Toshitaka, Takahashi, Akiyoshi, Takahashi, Kunio, Takahashi, Shuhei, Takata, Morimasa, Tanaka, Yoichi, Uemura, Ryu, Watanabe, Genta, Watanabe, Okitsugu, Yamasaki, Tetsuhide, Yokoyama, Kotaro, Yoshimori, Masakazu, and Yoshimoto, Takayasu

Abstract

Climatic variabilities on millennial and longer time scales with a bipolar seesaw pattern have been documented in paleoclimatic records, but their frequencies, relationships with mean climatic state, and mechanisms remain unclear. Understanding the processes and sensitivities that underlie these changes will underpin better understanding of the climate system and projections of its future change. We investigate the long-term characteristics of climatic variability using a new ice-core record from Dome Fuji, East Antarctica, combined with an existing long record from the Dome C ice core. Antarctic warming events over the past 720,000 years are most frequent when the Antarctic temperature is slightly below average on orbital time scales, equivalent to an intermediate climate during glacial periods, whereas interglacial and fully glaciated climates are unfavourable for a millennial-scale bipolar seesaw. Numerical experiments using a fully coupled atmosphere-ocean general circulation model with freshwater hosing in the northern North Atlantic showed that climate becomes most unstable in intermediate glacial conditions associated with large changes in sea ice and the Atlantic Meridional Overturning Circulation. Model sensitivity experiments suggest that the prerequisite for the most frequent climate instabilitywith bipolar seesaw pattern during the late Pleistocene era is associated with reduced atmospheric CO2 concentration via global cooling and sea ice formation in the North Atlantic, in addition to extended Northern Hemisphere ice sheets.

Published
2017

8. Deep ice core drilling to 2503m depth at Dome Fuji, Antarctica

Author

Fujii, Yoshiyuki, Azuma, Nobuhiko, Tanaka, Yoichi, Nakayama, Yoshiki, Kameda, Takao, Shinbori, Kunio, Katagiri, Kazuo, Fujita, Shuji, Takahashi, Akiyoshi, Kawada, Kunio, Motoyama, Hideaki, Narita, Hideki, Kamiyama, Kokichi, Furukawa, Teruo, Takahashi, Shuhei, Shoji, Hitoshi, Enomoto, Hiroyuki, Saitoh, Takeshi, Miyahara, Morihiro, Naruse, Renji, Hondoh, Takeo, Shiraiwa, Takayuki, Yokoyama, Kotaro, Ageta, Yutaka, Saito, Takashi, and Watanabe, Okitsugu

Abstract

Deep ice core drilling was carried out at Dome Fuji, Antarctica in 1995 and 1996 from the bottom of the casing installed in 1993 and reached 2503.52m in December 1996. We used a JARE type electromechanical drill with a core barrel of 2.2m length. Total numbers of ice corings and chip collections were 1369 and 837 respectively. The mean coring depths per run and per day were 1.75m and 8.21m, respectively. Quality of ice cores was perfect throughout the whole depth, even in the brittle zone. We report the outline of the system, coring performance, and troubles encountered., application/pdf

Published
2002

9. Improvements to the JARE deep ice core drill

Author

Takahashi, Akiyoshi, Fujii, Yoshiyuki, Azuma, Nobuhiko, Motoyama, Hideaki, Shinbori, Kunio, Tanaka, Yoichi, Narita, Hideki, Nakayama, Yoshiki, Kameda, Takao, Fujita, Shuji, Furukawa, Teruo, Takata, Morimasa, Miyahara, Morihiro, and Watanabe, Okitsugu

Subjects
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
Abstract

The second phase of the deep ice core drilling at Dome Fuji, Antarctica is planned to be carried out in three successive summer seasons starting from 2003/2004 with an improved JARE deep ice core drill. On the basis of tests, major improvements were made including extension of the core barrel to 4m, addition of a more powerful chip-collecting pump, addition of a check valve to avoid loss of collected chips while hoisting the drill in borehole liquid, and a more powerful drill motor. This report describes the improvements and results of the tests as of December 2000., application/pdf

Published
2002

11. 南極ドームふじでの深層掘削孔の検層観測

Author

Motoyama, Hideaki, Furusaki, Atsushi, Takahashi, Akiyoshi, Tanaka, Yoichi, Miyahara, Morihiro, Takata, Morimasa, Sawagaki, Takanobu, Matoba, Sumito, Sugiyama, Shin, Shinbori, Kunio, and Mori, Shoichi

Abstract

第4回極域科学シンポジウム個別セッション：[OM] 気水圏11月15日（金） 国立極地研究所 ３階ラウンジ

Published
2013

12. An experiment on ice cutting under high liquid pressure and 1ow temperature

Author

Narita,Hideki, Shinbori, Kunio, Kodama ,Yuji, and Institute of Low Temperature Science, Hokkaido University/Institute of Low Temperature Science, Hokkaido University/Institute of Low Temperature Science, Hokkaido University

Abstract

In order to examine dependencies of hydro-pressure and ice temperature in ice cutting performance of a drill for deep ice coring, experiments on ice cutting were carried out under liquid pressure from 0.1MPa to 30MPa at temperatures of 12.3,-40.3℃ and -62.0℃ changing the rake angle of the ice cutter. The results showed the penetration speed of the drill for a given rake angle decreased for at lower temperature and higher pressure; for a constant penetration speed, larger torque was required at higher pressure and lower temperature. Also, the larger the rake angle, the smaller the penetration speed. When the rake angle of the ice cutter was 17°, the drill performed at the designed penetration speed.

Published
1994

13. ドームふじ深層掘削孔検層観測と氷床底面状態について

Author

Motoyama, Hideaki, Shinbori, Kunio, Kuramoto, Takayuki, Iizuka, Yoshinori, Miyake, Takayuki, Hirabayashi, Motohiro, and Matoba, Sumito

Abstract

第2回極域科学シンポジウム 氷床コアセッション 11月16日（水） 国立極地研究所 2階大会議室前フロア

Published
2011

14. Distribution of antibiotic resistance genes in glacier environments

Author

Segawa, Takahiro, primary, Takeuchi, Nozomu, additional, Rivera, Andres, additional, Yamada, Akinori, additional, Yoshimura, Yoshitaka, additional, Barcaza, Gonzalo, additional, Shinbori, Kunio, additional, Motoyama, Hideaki, additional, Kohshima, Shiro, additional, and Ushida, Kazunari, additional

Published
2012
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18. State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling.

Author

Kawamura K, Abe-Ouchi A, Motoyama H, Ageta Y, Aoki S, Azuma N, Fujii Y, Fujita K, Fujita S, Fukui K, Furukawa T, Furusaki A, Goto-Azuma K, Greve R, Hirabayashi M, Hondoh T, Hori A, Horikawa S, Horiuchi K, Igarashi M, Iizuka Y, Kameda T, Kanda H, Kohno M, Kuramoto T, Matsushi Y, Miyahara M, Miyake T, Miyamoto A, Nagashima Y, Nakayama Y, Nakazawa T, Nakazawa F, Nishio F, Obinata I, Ohgaito R, Oka A, Okuno J, Okuyama J, Oyabu I, Parrenin F, Pattyn F, Saito F, Saito T, Saito T, Sakurai T, Sasa K, Seddik H, Shibata Y, Shinbori K, Suzuki K, Suzuki T, Takahashi A, Takahashi K, Takahashi S, Takata M, Tanaka Y, Uemura R, Watanabe G, Watanabe O, Yamasaki T, Yokoyama K, Yoshimori M, and Yoshimoto T

Abstract

Climatic variabilities on millennial and longer time scales with a bipolar seesaw pattern have been documented in paleoclimatic records, but their frequencies, relationships with mean climatic state, and mechanisms remain unclear. Understanding the processes and sensitivities that underlie these changes will underpin better understanding of the climate system and projections of its future change. We investigate the long-term characteristics of climatic variability using a new ice-core record from Dome Fuji, East Antarctica, combined with an existing long record from the Dome C ice core. Antarctic warming events over the past 720,000 years are most frequent when the Antarctic temperature is slightly below average on orbital time scales, equivalent to an intermediate climate during glacial periods, whereas interglacial and fully glaciated climates are unfavourable for a millennial-scale bipolar seesaw. Numerical experiments using a fully coupled atmosphere-ocean general circulation model with freshwater hosing in the northern North Atlantic showed that climate becomes most unstable in intermediate glacial conditions associated with large changes in sea ice and the Atlantic Meridional Overturning Circulation. Model sensitivity experiments suggest that the prerequisite for the most frequent climate instability with bipolar seesaw pattern during the late Pleistocene era is associated with reduced atmospheric CO 2 concentration via global cooling and sea ice formation in the North Atlantic, in addition to extended Northern Hemisphere ice sheets.

Published
2017
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