Proxy evaluation of tree-ring oxygen isotopic ratios in Myanmar for paleoclimate reconstruction

• Project/Area Number: 18K11620
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 63010:Environmental dynamic analysis-related
• Research Institution: Kyoto University
• Principal Investigator: Watanabe Yumiko 京都大学, 理学研究科, 助教 (20509939)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 樹木年輪 / 同位体比 / 同位体 / 酸素同位体比 / 古気候変動

Outline of Final Research Achievements

In this study, we measured tree-ring width and cellulose oxygen isotopic ratio of teak samples collected from Myanmar and compared them with meteorological data to comprehensively evaluate their reliability as paleoclimate proxies and to establish a basis for climatic and environmental reconstruction with high temporal resolution in Myanmar. The results suggest that the tree-ring width of teak could be useful as a precipitation indicator during the rainy season, and the oxygen isotopic ratio may have information on the origin of precipitation.

Academic Significance and Societal Importance of the Research Achievements

人口稠密で モンスーンによる降水に依存しているアジアにおいて、過去のモンスーン変動をより詳細に理解することは極めて重要である。このため、近年 樹木年輪による古気候研究が精力的に行われてきたが、政治的に不安定であったミャンマーでは、これらの研究は限られてきた。本研究では、ミャンマーにおけるチークの年輪研究から降水に関する新知見を得られたことで、ミャンマーと広域のモンスーンアジアにおける水文気候の時空変動像の理解深化に資する。

Research Products

• [Int'l Joint Research] イエツェン農業大学(ミャンマー)
• [Journal Article] Climate response of oxygen isotopic compositions in tree-ring cellulose in Java: evaluation using a proxy system model (2021)
  • Author(s): Hisamochi, R., Watanabe, Y., Kurita, N., Tagami, T.
  • Journal Title: Atmosphere Volume: 12 Issue: 3 Pages: 310-310
  • DOI: 10.3390/atmos12030310
  • Peer Reviewed / Open Access
• [Journal Article] Cellulose oxygen isotopic composition of teak (Tectona grandis) collected from Java Island: a tool for dendrochronological and dendroclimatological analysis (2018)
  • Author(s): Hisamochi, R., Watanabe, Y., Sano, M., Nakatsuka, T., Kurita, N., Matsuo-Ueda, M., Yamamoto, H., Tazuru, S., Sugiyama, J., Subiyanto, B., Marsoem, S.N., Tsuda, T., Tagami, T.
  • Journal Title: Dendrochronologia Volume: 52 Pages: 80-86
  • DOI: 10.1016/j.dendro.2018.09.010
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 年輪幅とセルロース同位体比による降水情報の抽出：インドネシアとミャンマーでの事例 (2021)
  • Author(s): 渡邊裕美子
  • Organizer: 第441回生存圏シンポジウム
• [Presentation] Cellulose oxygen isotopic time series of teak disks collected from Bago Mountains, Myanmar (2020)
  • Author(s): Ohmuro, W., Watanabe, Y., Li, Z., Nakatsuka, T.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Cellulose oxygen isotopic time series of teak disks collected from Java, Indonesia (2020)
  • Author(s): Watanabe, Y., Hisamochi, R., Sano, M., Nakatsuka, T., Tagami, T.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research / Invited
• [Presentation] Hydrogen, carbon, and oxygen isotopic variations of tree ring cellulose in Mt. Hiei, Shiga (2020)
  • Author(s): Katayama, Y., Watanabe, Y., Li, Z., Nakatsuka, T.
  • Organizer: The 5th Asia Research Node Symposium on Humanosphere Science
  • Int'l Joint Research
• [Presentation] 遺跡出土材を対象とした年輪セルロース酸素・水素同位体比年層内変動の検討 (2020)
  • Author(s): 中島公洋, 李貞, 中塚武, 渡邊裕美子, 田上高広
  • Organizer: 日本文化財学会第37回大会
• [Presentation] 年輪幅とセルロース同位体比による降水情報の抽出：インドネシアとミャンマーでの事例 (2020)
  • Author(s): 渡邊裕美子
  • Organizer: 第425回生存圏シンポジウム
• [Presentation] Basic research on paleoclimate reconstruction using teak tree-rings collected from Bago Mountains, Myanmar (2019)
  • Author(s): Ohmuro, W., Watanabe, Y., Li, Z., Nakatsuka, T., Takeda, S. and Tagami, T.
  • Organizer: The 4th Asia Research Node Symposium on Humanosphere Science
  • Int'l Joint Research
• [Presentation] Paleoclimate study based on tree-ring width and the isotopic geochemistry; case studies of Indonesia and Myanmar (2019)
  • Author(s): Watanabe, Y. and Tagami, T
  • Organizer: The 4th Asia Research Node Symposium on Humanosphere Science
  • Int'l Joint Research / Invited
• [Presentation] インドネシア島チークを用いた年輪気候学における年輪幅測定法の検証 (2018)
  • Author(s): 新井貴之・渡邊裕美子・久持亮・杉山淳司・松尾美幸・山本浩之・津田敏隆・田上高広
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] ミャンマー・バゴー山地産チーク年輪幅と気象データとの比較 (2018)
  • Author(s): 大室渉・渡邊裕美子・田上高広・竹田晋也
  • Organizer: 日本地球惑星科学連合2018年大会