Twentieth-century summer temperature variability in the southern Altai Mountains: A carbon and oxygen isotope study of tree-rings
Twentieth-century summer temperature variability in the southern Altai Mountains: A carbon and oxygen isotope study of tree-rings
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DOI：
10.1177/0959683610369507
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
N. Loader;G. Helle;S. Los;F. Lehmkuhl;G. Schleser
中科院分区：
文献类型：
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作者：
N. Loader;G. Helle;S. Los;F. Lehmkuhl;G. Schleser
西伯利亚南部的阿尔泰山脉是一个具有重要科学意义和特殊古生态潜力的地区。为了评估气候对树木年轮纤维素的稳定同位素组成的影响以及该记录作为古气候代用品的潜力，从生长在俄罗斯阿尔泰山阿克塔什定居点附近的四棵西伯利亚松（Pinus sibirica Du Tour）中复制了20世纪的稳定氧和碳同位素时间序列。自举校准的本地仪器期间（AD 1954-2000年）显示夏季（7月至8月）生长季节的温度和树轮氧（r 2=0.55）和碳（r 2=0.30）同位素之间的强相关性。碳和氧同位素数据之间观察到的协方差表明一个共同的（气孔）控制。由此产生的经验模型被用来重建区域夏季温度为二十世纪。未消除趋势的树轮同位素系列和仪器数据之间没有分歧，也没有任何二十世纪夏季变暖的趋势。强同位素信号保存在树轮系列支持更广泛地应用这种方法来探索气候变化和环境趋势，在过去的几千年中，通过分析新的和现有的长树轮年表从这个地区。
The Altai mountains, southern Siberia, represent an area of significant scientific interest and exceptional palaeoecological potential. To assess the influence of climate on the stable isotopic composition of tree-ring cellulose and the potential of this record as a palaeoclimate proxy, replicated stable oxygen and carbon isotope time-series were developed for the twentieth century from four Siberian Pine (Pinus sibirica Du Tour) trees growing near the settlement of Aktash, Russian Altai mountains, southern Siberia. Bootstrapped calibrations for the local instrumental period (AD 1954—2000) reveal strong correlations between summer (July—August) growing season temperatures and tree-ring oxygen (r 2=0.55) and carbon (r 2=0.30) isotopes. Covariance observed between both carbon and oxygen isotope data suggest a common (stomatal) control. The resulting empirical model was used to reconstruct regional summer temperatures for the twentieth century. No divergence is observed between the non-detrended tree-ring isotope series and instrumental data nor is there any twentieth-century summer warming trend. The strong isotopic signal preserved in the tree-ring series supports the wider application of this approach to explore climatic variability and environmental trends during past millennia through analysis of new and existing long tree-ring chronologies from this region.