Climate Response of Oxygen Isotopic Compositions in Tree-Ring Cellulose in Java: Evaluation Using a Proxy System Model
Climate Response of Oxygen Isotopic Compositions in Tree-Ring Cellulose in Java: Evaluation Using a Proxy System Model
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DOI：
10.3390/atmos12030310
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发表时间：
2021-02
期刊：
影响因子：
2.9
通讯作者：
Ryo Hisamochi;Yumiko Watanabe;N. Kurita;T. Tagami
中科院分区：
文献类型：
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作者：
Ryo Hisamochi;Yumiko Watanabe;N. Kurita;T. Tagami
树木年轮纤维素氧同位素组成（δ 18 O）受降水、相对湿度和温度等水文因素的控制。一个代理系统模型可以揭示这些因素如何影响树轮纤维素δ 18 O。为了确定控制树轮纤维素δ 18 O变化的关键因素，对1960 ~ 1998年印尼爪哇柚木树轮纤维素δ 18 O的年际变化进行了模型计算。我们的模型结果合理地再现了观测到的δ 18 O值及其时间变化（r = 0.6; p < 0.001）。敏感性试验表明，纤维素δ 18 O值对柚木生长期敏感。生长期提前或推迟的模拟结果反映了39年来观测到的δ 18 O变化幅度。这些结果表明，爪哇柚木的年轮纤维素δ 18 O可能受到年内生长期的微妙变化的影响。
Tree-ring cellulose oxygen isotopic composition (δ18O) is controlled by several hydrological factors such as precipitation, relative humidity, and temperature. A proxy system model can reveal how these factors affect tree-ring cellulose δ18O. In this study, to identify a key control on tree-ring cellulose δ18O variations, we performed model calculation of year-to year variation of tree-ring cellulose δ18O of Javanese teak in Indonesia from 1960 to 1998. Our model results reasonably reproduce the observed δ18O values and their temporal variations (r = 0.6; p < 0.001). Moreover, the sensitivity test shows that the cellulose δ18O values are sensitive to the teak growing period. The simulation result with earlier or later shifts of the growing period captured the amplitude of observed δ18O variations over 39 years. These results indicate that the tree-ring cellulose δ18O of Javanese teak might be influenced by a subtle shift of the intra-annual growing period.