Sulfur and nitrogen isotopes in a single particle of sulfate and nitrate aerosols in polar ice cores

• Project/Area Number: 16K12573
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Hokkaido University
• Principal Investigator: Iizuka Yoshinori 北海道大学, 低温科学研究所, 助教 (40370043)
• Research Collaborator: Uemura Ryu ; Sano Yuji ; Kagoshima Shogo ; Ando Takuto
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: エアロゾル / 同位体比 / アイスコア / 個別粒子 / 塩微粒子 / 硫黄同位体比 / 窒素同位体比 / 環境変動 / 環境分析 / 極地 / 地球化学

Outline of Final Research Achievements

In order to measure sulfur and nitrogen isotopes in a single particle of sulfate and nitrate aerosols in polar ice cores, we collected particles on a mesh from ice cores. Then, we measured sulfur isotopes of the single particles. As a result, the average isotope values are about 22 ‰, which is reasonable result for natural sulfate aerosols, however with large error of about 10 ‰.

Academic Significance and Societal Importance of the Research Achievements

エアロゾルは小さな個体粒子（もしくは液滴）からなり、地球表面気温に影響を与える。アイスコアには過去のエアロゾルが保存されている。エアロゾルの同位体比を分析することでエアロゾルの起源を推定できるが、これまで粒子一粒ごとの同位体比の分析は困難であった。本研究はナノシムスという装置をアイスコアに含まれる過去のエアロゾルに適用し、硫酸塩エアロゾルの粒子一粒ごとの硫黄同位体比の分析に成功した。

Research Products

• [Journal Article] A 60-year record of atmospheric aerosol depositions preserved in a high-accumulation dome ice core, southeast Greenland (2018)
  • Author(s): Iizuka, Y., R. Uemura, K. Fujita, S. Hattori, O. Seki, C. Miyamoto, T. Suzuki, N. Yoshida, H. Motoyama and Sumito Matoba
  • Journal Title: Journal of Geophysical Research:Atmosphere Volume: 123 Issue: 1 Pages: 574-589
  • DOI: 10.1002/2017jd026733
  • NAID: 120006486796
  • Peer Reviewed / Open Access
• [Journal Article] Seasonal-scale dating of a shallow ice core from Greenland using oxygen isotope matching between data and simulation. (2017)
  • Author(s): Ryoto Furukawa, Ryu Uemura, Koji Fujita, Jesper Sjolte, Kei Yoshimura, Sumito Matoba, and Yoshinori Iizuka
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 122 Issue: 20 Pages: 10873-10887
  • DOI: 10.1002/2017jd026716
  • NAID: 120006466468
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A firn densification process in the high accumulation dome of southeastern Greenland (2017)
  • Author(s): Yoshinori Iizuka, Atsushi Miyamoto, Akira Hori, Sumito Matoba, Ryoto Furukawa, Takeshi Saito, Shuji Fujita, Motohiro Hirabayashi, Satoru Yamaguchi, Koji Fujita, Nozomu Takeuchi
  • Journal Title: Arctic, Antarctic, and Alpine Research Volume: 49 Pages: 13-27
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] グリーンランド南東部、高涵養量ドームにおける浅層アイスコアプロ ジェクトの概要と研究成果 (2018)
  • Author(s): 飯塚 芳徳、的場 澄人、ほか
  • Organizer: 日本地球惑星科学連合2018年大会
  • Invited
• [Presentation] Aerosols Preserved in a High-accumulation Dome Ice Core, Southeast Greenland (2018)
  • Author(s): Iizuka, Y., R. Uemura, K. Fujita, S. Matoba
  • Organizer: Polar2018
  • Int'l Joint Research
• [Presentation] Analysis of insoluble particles in the ice core from south-east dome Greenland (2018)
  • Author(s): Tomomi Amino, T., Y. Iizuka, K. Fujita, N. Oshima and S. Matoba
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Nitrogen isotope of nitrate in Arctic ice core records past anthropogenic energy shift (2018)
  • Author(s): Hattori, S., A. Tsuruta, Y. Iizuka, K. Fujita, R. Uemura, S. Matoba, N. Yoshida
  • Organizer: International Global Atmospheric Chemistry (IGAC)
  • Int'l Joint Research