Dendroclimatic Reconstruction of Summer Temperature at the Akaishi Mountains since A.D. 1774
Dendroclimatic Reconstruction of Summer Temperature at the Akaishi Mountains since A.D. 1774
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DOI：
10.5026/jgeography.128.49
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
K. Yasue;N. Kubo;Mikiko Akao;M. Sano;T. Nakatsuka
中科院分区：
文献类型：
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作者：
K. Yasue;N. Kubo;Mikiko Akao;M. Sano;T. Nakatsuka
摘要研究了明石山仙鹤山亚高山森林中不同生长类型的红杉（Tsuga disfolia）和云杉（Picea jezoensis var. hondoensis）的环宽、最大密度和δ 18o年代学。用x射线密度仪测定环宽和最大密度。提取纤维素后，用质谱仪测定树木年轮δ 18o。7、8、9月的年代学与月气温均呈显著正相关，但叶黄松的年代学与月气温呈显著正相关。利用4种年表建立了7 - 9月气温的传递函数，并进行了统计验证。传递函数显示出高的决定系数，而统计验证不成功，相当低的RE， CE和符号检验。自1774年以来的估计温度与基于历史记录的报告气候变化部分一致。结果表明，估算温度对于重建温度的增加趋势和低频变化是微弱的，尽管它对局部地区的高频温度变化可能有用。
― ― Abstract Ring width, maximum density, and δ 18 O chronologies of Tsuga diversifolia and Picea jezoensis var. hondoensis growing in a sub-alpine forest at Mt. Senjo in the Akaishi Mountains were developed. Ring width and maximum density were measured with X-ray densitometry. Tree-ring δ 18 O was measured using a mass spectrometer after cellulose extraction. The chronologies developed have significant positive correlations with monthly temperatures in July, August, and September, with the exception of the ring width of T. diversifolia . The transfer functions for July-September temperature were developed using the four chronologies and were verified statistically. The transfer functions reveal a high coefficient of determination, whereas statistical verifications were not successful with rather low RE, CE, and sign test. The estimated temperatures since 1774 partially agreed with reported climate changes based on historical records. The results indicate that estimated temperature is weak for reconstructing increasing trends and low-frequency variations of temperature, although it is potentially useful for higher frequency temperature changes in local areas.