[S-GL34] 地球年代学・同位体地球科学

[SGL34-P01] インドネシア・ジャワ産チークにおける年輪セルロース酸素同位体比変動

★招待講演

*渡邊 裕美子¹、久持 亮¹、佐野 雅規²、中塚 武³、田上 高広¹ (1.京都大学大学院理学研究科地球惑星科学専攻、2.早稲田大学人間科学学術院、3.名古屋大学)

キーワード：同位体、酸素、年輪、セルロース、インドネシア

Tree rings are useful to reconstruct terrestrial paleoclimate because of their precise dating and high time resolution. In the tropics, there are few dendroclimatological studies because it is difficult to collect tree samples with annual rings. In Indonesia, the master chronology of tree ring has been constructed since the study of Berlage (1931) and perfomed correlation analyses with precipitation data (e.g., D'Arrigo et al., 1994). Moreover, previous studies of Poussart et al. (2004) and Schollaen et al. (2013) measured oxygen isotope ratios of Javanese teak, suggesting that it could be an effective proxy of precipitation. However, these previous studies conducted at limited area of Java Island, and thus the spatial coherency still remains unknown. In this study, we measured cellulose oxygen isotopic compositions of ten teak disks collected at four sites in Java, and verified the synchronicity of the time series variations.