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Express Letter

A 180-year-long isotopic record of tree-ring cellulose on Okinawa Island, Japan

Ryu Uemura, Miki Uemura, Masaki Sano, Takeshi Nakatsuka
Geochemical Journal, Vol. 52, No. 6, P. e21-e27, 2018

ABSTRACT

The oxygen isotope ratio (δ18O) of tree-ring cellulose provides a valuable climatic record with an annual timescale. In Japan, the cellulose δ18O records have been accumulated over the past decade. However, no long-term records have been reported for the southern subtropical island, Okinawa-jima, where many long-lived trees were burned during the Second World War and have been periodically damaged by typhoons. Here, we show a cellulose δ18O of Ryukyu Pine (Pinus luchuensis Mayr.) from the Okinawa-jima island. This δ18O data, which was obtained from a tree-disk preserved in a University Museum, cover a 95-year period before meteorological observation began on this island in 1891. The cellulose δ18O variations negatively correlate with the amount of precipitation during the rainy season, suggesting that the cellulose δ18O values are largely affected by δ18O of rainwater rather than large scale ENSO variations.

KEYWORDS

tree-ring, oxygen isotope, monsoon, paleo climate, Okinawa

Supplementary Materials(file)

https://www.jstage.jst.go.jp/article/geochemj/52/6/52_2.0543/_supplement/_download/52_2.0543_1.pdf

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