Climate analysis using sulfur stable isotope ratio from Antarctic snow and ice core

• Project/Area Number: 26550013
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: University of the Ryukyus
• Principal Investigator: UEMURA Ryu 琉球大学, 理学部, 准教授 (00580143)
• Co-Investigator(Kenkyū-buntansha): 本山 秀明 国立極地研究所, 研究教育系, 教授 (20210099)
• Co-Investigator(Renkei-kenkyūsha): HIRABAYASHI Motohiro 情報・システム研究機構, 国立極地研究所, 特任助手 (20399356) ; IIZUKA Yoshinori 北海道大学, 低温科学研究所, 助教 (40370043)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 硫酸エアロゾル / アイスコア / 硫黄同位体比 / 氷期サイクル / 南極 / フィードバック / 温暖化 / 海洋生物活動 / 安定同位体比 / 気候変動 / DMS / 硫黄同位体 / 安定同位体 / 氷期

Outline of Final Research Achievements

Sulfate aerosols affect Earth’s radiative forcing through direct and indirect effects. Ice core data suggest minor changes in sulfate aerosols over the glacial cycles. However, the variations of source contributions of sulfate aerosols remain unclear. In this project, to estimate the changes in source contributions of sulfate aerosols in Antarctica, we analyzed sulfur isotopic ratios of surface snow and ice core. Sulfur isotope ratio of present-day surface snow over East Antarctica shows that the effects of the transport process are small, and major source of present-day sulfate aerosol is marine biogenic activity. The ice core data show that the sulfur isotopic ratio increased from the last glacial period to Holocene.

Research Products

• [Int'l Joint Research] CEA-CNRS(France)
• [Journal Article] Spatial variation of isotopic compositions of snowpack nitrate related to post-depositional processes in eastern Dronning Maud Land, East Antarctica (2018)
  • Author(s): Kazushi Noro, Shohei Hattori, Ryu Uemura, Kotaro Fukui, Motohiro Hirabayashi, Kenji Kawamura, Hideaki Motoyama, Norimichi Takenaka and Naohiro Yoshida
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 52 Issue: 2 Pages: e7-e14
  • DOI: 10.2343/geochemj.2.0519
  • NAID: 130006708587
  • ISSN: 0016-7002, 1880-5973
  • Year and Date: 2018-03-09
  • Peer Reviewed / Open Access
• [Journal Article] Asynchrony between Antarctic temperature and CO2 associated with obliquity over the past 720,000 years (2018)
  • Author(s): Uemura, R., H. Motoyama, V. Masson-Delmotte, J. Jouzel, K. Kawamura, K. Goto-Azuma, S. Fujita, T. Kuramoto, M. Hirabayashi, T. Miyake, H. Ohno, K. Fujita, A. Abe-Ouchi, Y. Iizuka, S. Horikawa, M. Igarashi, K. Suzuki, T. Suzuki, Y. Fujii
  • Journal Title: Nature Communications Volume: 9 Issue: 1 Pages: 1-11
  • DOI: 10.1038/s41467-018-03328-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sulfur isotopic composition of surface snow along a latitudinal transect in East Antarctica (2016)
  • Author(s): Ryu Uemura, Kosuke Masaka, Kotaro Fukui, Yoshinori Iizuka, Motohiro Hirabayashi and Hideaki Motoyama
  • Journal Title: Geophysical Research Letters Volume: 43 Issue: 11 Pages: 5878-5885
  • DOI: 10.1002/2016gl069482
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [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] Chemical compositions of sulfate and chloride salts over the last termination reconstructed from the Dome Fuji ice core, inland Antarctica (2014)
  • Author(s): Oyabu, I., Y. Iizuka, R. Uemura, T. Miyake, M. Hirabayashi, H. Motoyama, T. Sakurai, T. Suzuki, T. Hondoh
  • Journal Title: Journal of Geophysical Research Volume: 119 Issue: 24 Pages: 14045-14058
  • DOI: 10.1002/2014jd022030
  • NAID: 120005617278
  • Peer Reviewed / Open Access
• [Presentation] DF アイスコアの硫黄安定同位体比の解析結果 (2018)
  • Author(s): 植村 立
  • Organizer: ドームふじICC年次研究集会:南極ドームふじ氷床深層アイスコアの解析による気候・環境変動の研究の新展開
• [Presentation] 過去70万年間の南極と南大洋における年平均日射量に対する温度変動の応答 (2017)
  • Author(s): 植村立、ドームふじ氷床コア研究グループ
  • Organizer: 日本地球惑星科学連合 連合大会2017年大会
• [Presentation] ドームふじアイスコア中の硫黄同位体分析による硫酸エアロゾルの起源推定 (2016)
  • Author(s): 植村立、眞坂昂佑、松本理誠、植村美希、飯塚芳徳、平林幹啓、本山秀明
  • Organizer: 日本地球化学会 年会
  • Place of Presentation: 大阪市立大学, 大阪府 大阪市
  • Year and Date: 2016-09-14
• [Presentation] 硫黄同位体比分析による東南極表面雪の硫酸エアロゾルの起源推定 (2016)
  • Author(s): 植村立、眞坂昂佑、福井幸太郎、飯塚芳徳、平林幹啓、本山秀明
  • Organizer: 日本地球惑星科学連合 連合大会2016年大会
  • Place of Presentation: 幕張メッセ, 千葉県 千葉市
  • Year and Date: 2016-05-22
• [Presentation] DFコアの硫酸イオンの硫黄同位体比と水の水素・酸素同位体解析 (2016)
  • Author(s): 植村 立
  • Organizer: 「両極域における第四紀の気候・環境変動」研究集会
  • Place of Presentation: 国立極地研究所， 東京
  • Year and Date: 2016-03-29
• [Presentation] 東南極表面積雪とアイスコア中の硫黄同位体分析による硫酸エアロゾルの変動メカニズムの解析 (2015)
  • Author(s): 眞坂昂佑、植村立、福井幸太郎、飯塚芳徳、松本理誠、植村美希、平林幹啓、本山秀明
  • Organizer: 第5回同位体環境学シンポジウム
  • Place of Presentation: 総合地球環境学研究所，京都
  • Year and Date: 2015-12-25
• [Presentation] 南極表層積雪とドームふじアイスコア中の硫黄同位体分析による硫酸エアロゾルの変動メカニズムの解析 (2015)
  • Author(s): 眞坂昂佑、植村立、福井幸太郎、飯塚芳徳、松本理誠、植村美希、平林幹啓、本山秀明
  • Organizer: 日本地球化学会 年会
  • Place of Presentation: 横浜国立大，神奈川
  • Year and Date: 2015-09-16
• [Presentation] 南極氷床表面雪における海塩の硫酸塩化反応 (2014)
  • Author(s): 飯塚芳徳，保科優，植村立，大野浩，平林幹啓，福井幸太郎， 鈴木利孝， 本山秀明
  • Organizer: 雪氷研究大会
  • Place of Presentation: 八戸工業大学、青森県
  • Year and Date: 2014-09-20 – 2014-09-22
• [Presentation] スズ箔への直接蒸発乾固による天水中の硫黄同位体比測定法の検討 (2014)
  • Author(s): 眞坂 昂佑, 植村立, 宮城正宙, 松本理誠
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 富山大学、富山県
  • Year and Date: 2014-09-16 – 2014-09-18
• [Book] 低温環境の科学事典 (項目分担「さまざまな過去の気温推定法) (2016)
  • Author(s): 河村公隆編
  • Total Pages: 432
  • Publisher: 朝倉書店