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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees
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Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees

机译：泰国北部落叶乔木的季节性稳定同位素年代学

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摘要

Despite the existence of a number of climate proxies, the terrestrial expression of tropical climate variability over the past few centuries remains poorly resolved. We explore the applicability of stable isotope dendroclimatology as a tool for chronology and paleo-hydrology reconstruction on deciduous trees from monsoonal northern Thailand. Analysis of 11 trees coming from 4 different regions of northern Thailand yielded 7 records with varying degrees of delta(18)O and delta(13)C seasonality. We develop age models for trees lacking visible rings based on the seasonality of the delta(18)O and find agreement to within >= 3 years with radiocarbon age estimates. We use the isotopic age models to reconstruct estimates of growth rates and find a significant positive correlation between growth and amplitude of the oxygen and carbon seasonal isotopic signals. A comparison of a reconstructed dendro-isotopic index from Pangmapa with regional rainfall records indicates significant correlations consistent with the locally derived patterns but with decreased representation of the variance. Individual isotopic chronologies stemming from different tree species share common trends, which are also consistent with patterns of rainfall variability. We see an increase in the amplitude of the seasonal delta(18)O cycle along with an increase in delta(18)O(max) over the past few decades suggesting a tracking of the recent drying trend of Thailand's monsoon. (c) 2005 Elsevier B.V. All rights reserved.
机译：尽管存在许多气候代理，但在过去几个世纪中，热带气候变率在陆地上的表现仍然难以解决。我们探索稳定同位素树状气候学的适用性，作为泰国北部季风的落叶树的年代学和古水文重建工具。对来自泰国北部4个不同地区的11棵树木进行的分析得出了7条记录，这些记录具有不同程度的delta（18）O和delta（13）C季节性。我们基于delta（18）O的季节性为缺少可见环的树木开发了年龄模型，并在> = 3年内与放射性碳年龄估计达成了一致。我们使用同位素年龄模型来重建生长速率的估计值，并发现氧和碳季节同位素信号的生长和幅度之间存在显着的正相关。庞帕帕州重建树突同位素指数与区域降雨记录的比较表明，显着的相关性与当地衍生的模式一致，但减少了方差表示。来自不同树种的各个同位素年代学具有共同的趋势，这也与降雨变化的模式一致。在过去的几十年中，我们看到季节性delta（18）O周期的振幅增加，而delta（18）O（max）的增加也暗示了泰国季风最近的干燥趋势的跟踪。 （c）2005 Elsevier B.V.保留所有权利。

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