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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An investigation of the common signal in tree ring stable isotope chronologies at temperate sites
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An investigation of the common signal in tree ring stable isotope chronologies at temperate sites

机译：温带地区年轮稳定同位素年代学中常见信号的研究

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It is currently not well known how coherent carbon and oxygen isotope chronologies from different species and sites are under temperate climate conditions. Here we investigated nine chronologies from Switzerland covering the last two centuries, including three deciduous species (Fagus sylvatica, Fraxinus excelsior, and Quercus petraea) and three conifer species (Abies alba, Picea abies, and Pinus sylvestris) from sites neither strongly limited by temperature nor precipitation. All of the chronologies except Fraxinus were significantly correlated to at least one other chronology. Correlations between different species of the same site were of similar strength to correlations between the sites. We observed a strong common high-frequency (interannual) signal for the δ 13C chronologies, whereas the low-frequency (decadal-scale) signal was more similar among the δ 18O chronologies. For both carbon and oxygen isotopes, we found significant positive relationships with annual and growing season temperatures and negative relationships with precipitation, again of similar magnitude for all species except for Fraxinus, which contained only minor climatic information. Averaging of all chronologies resulted in an increase in the climatic signal of the mean chronology. The combined δ 18O record reflected decadal-scale temperature variations remarkably well (r = 0.72). However, the relationship between climate and carbon isotopes declined over the last 3 decades of the 20th century, probably related to the steep increase in atmospheric CO2 concentrations, resulting in strongly diverging δ 13C trends of the different chronologies. Our study indicates that combining chronologies from different species enhances the potential of isotope studies for extending climate reconstructions into areas of temperate climate.
机译：目前尚不了解在温带气候条件下，来自不同物种和地点的碳和氧同位素的相干时间序列如何。在这里，我们调查了来自瑞士的九个年代，涵盖了过去两个世纪，包括来自不受温度严格限制的地点的三种落叶树种（Fagus sylvatica，优良的白蜡木和栎栎）和三种针叶树种（Abies alba，Picea abies和Pinus sylvestris）。也没有沉淀。除水曲星之外的所有时间序列都与至少一个其他时间序列显着相关。同一站点不同物种之间的相关强度与站点之间的相关强度相似。我们在δ13C时间序列中观察到了一个很强的常见高频（年际）信号，而在δ18O时间序列中，低频（十年尺度）信号更加相似。对于碳和氧同位素，我们发现它们与年度和生长季节温度具有显着的正相关关系，而与降水具有负相关关系，除水曲柳（仅包含少量气候信息）外，所有物种的幅度都相似。所有年表的平均值导致平均年表的气候信号增加。组合的δ18O记录了十年尺度的温度变化非常好（r = 0.72）。但是，气候与碳同位素之间的关系在20世纪的最后30年中下降了，这可能与大气中CO2浓度的急剧上升有关，从而导致不同年代的δ13C趋势差异很大。我们的研究表明，将不同物种的年代相结合，可以增强同位素研究将气候重建扩展到温带气候地区的潜力。

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