2016年3月
Controlling factors in stalagmite oxygen isotopic composition and the paleoprecipitation record for the last 1,100 years in Northeast Japan
GEOCHEMICAL JOURNAL
- ,
- 巻
- 50
- 号
- 6
- 開始ページ
- E1
- 終了ページ
- E6
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.2343/geochemj.2.0417
- 出版者・発行元
- GEOCHEMICAL SOC JAPAN
Stable oxygen isotopic analysis was performed on the UT-A stalagmite with annual microbanding from the Uchimagido Cave in Iwate Prefecture on the Pacific side of Northeast Japan. High-resolution analysis of the uppermost portion of UT-A revealed a positive correlation between the stalagmite delta O-18 value and R ((summer precipitation-winter precipitation)/annual precipitation) over the last several decades. This correlation is the result of the distinct seasonal shift in precipitation delta O-18. During the summer, rainfall with higher delta O-18 values arrives from the humid atmosphere over the Pacific Ocean. In the winter, comparatively little snowfall/rainfall, with lower delta O-18 values, arrives from the Japan Sea and is brought by Nangan cyclones (low-pressure systems that pass along the southern coast of Japan). In years with humid summers, large amounts of rainfall from the Pacific Ocean raise the delta O-18 values of the cave dripwater and stalagmites. Changes in precipitation over the last 1,100 years, reconstructed from the delta O-18 profile of the UT-A stalagmite, coincide with the historical records of famines and disasters triggered by rainfall excesses and shortages.
- リンク情報
- ID情報
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- DOI : 10.2343/geochemj.2.0417
- ISSN : 0016-7002
- eISSN : 1880-5973
- Web of Science ID : WOS:000392504000001