Assessment of sungkai tree-ring delta O-18 proxy for paleoclimate reconstruction in western Java, Indonesia

作者：Harada, Mao; Watanabe, Yumiko; Nakatsuka, Takeshi; Tazuru-Mizuno, Suyako; Horikawa, Yoshiki; Subiyanto, Bambang; Sugiyama, Junji; Tsuda, Toshitaka; Tagami, Takahiro

来源：Quaternary International, 2017, 432: 33-38.

DOI：10.1016/j.quaint.2015.03.038

• Tree ring
• alpha-Cellulose
• Stable isotope geochemistry
• Tropics
• Paleoclimate

To assess the reproducibility of sungkai delta O-18 as paleoclimate proxies, we measured annual delta O-18 variations of two sungkai trees that had been collected in the same area as in a previous study. Two sungkai delta O-18 variations showed significant mutual correlation (r = 0.80; P < 0.001) and correlation with results of earlier analyses, suggesting that external climatic factors affect the delta O-18 values of sungkai. The annual delta O-18 of SungkaiNAN7 shows significant, positive correlation with temperature, sunlight hours, and air pressure. It shows significant, negative correlation with relative humidity and SOI. Moreover, the seasonal delta O-18 variation acquired during severe drought of the 1997-1998 El Nino event shows that the maximum delta O-18 value around 1997 latewood corresponds to the rainfall/relative humidity minimum and corresponds to the temperature/sunlight hours/air pressure maximum with a considerable time lag.

• 出版日期2017-3-8