Deciphering the fluctuations of the East Asian winter monsoon since the Medieval Period from dune deposits

2015 Fiscal Year Final Research Report

• Project/Area Number: 24680088
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Geography
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Tamura Toru 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 主任研究員 (10392630)
• Research Collaborator: KODAMA Yoshinori 鳥取大学, 地域科学部, 教授 ; SAITO Yoshiki 産業技術総合研究所, 地質情報研究部門, 首席研究員 ; INOUE Takahiko 産業技術総合研究所, 地質情報研究部門, 主任研究員 ; ITO Kazumi 産業技術総合研究所, 活断層・火山研究部門, 研究員 ; ONO Eisuke 新潟大学, 教育学部, 准教授 ; KATAOKA Kyoko 新潟大学, 災害・復興科学研究所, 准教授 ; SAKAI Tetsuya 島根大学, 理工学部, 准教授 ; BATEMAN Mark D. The University of Sheffield, Department of Geography, Professor ; NGUYEN Van Lap Ho Chi Minh Institute of Resource Geography, Vietnamese Academy of Science and Technology, Director ; TA Thi Kim Oanh Ho Chi Minh Institute of Resource Geography, Vietnamese Academy of Science and Technology, Senior Researcher
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: モンスーン / アジア / 砂丘 / 海岸 / 小氷期

Outline of Final Research Achievements

An integrated geological and geophysical survey was carried out in four selected dune fields in Vietnam and Japan to clarify multi-decadal- to centennial-scale fluctuations in the East and Southeast Asian winter monsoon since the Medieval Period. Two distinct periods of the dune activity on the Japan Sea coast were inferred to have occurred during the 10-12th centuries and after the 15th century, correlated with the regional climate changes. The winter monsoon was found to greatly affect the coastal sedimentary system of the South China Sea. Transverse dunes in the Vietnamese dune field poorly record the deposits older than 100 years, while the internal architecture of larger longitudinal dunes is possibly useful for deciphering the long-term fluctuations in the winter monsoon.

Free Research Field

地理学