Do tree ring δ13C series from Pinus sylvestris in northern Fennoscandia contain long-term non-climatic trends?
Do tree ring δ13C series from Pinus sylvestris in northern Fennoscandia contain long-term non-climatic trends?
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DOI：
10.1016/j.chemgeo.2008.01.013
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发表时间：
2008-06-30
期刊：
影响因子：
3.9
通讯作者：
Jalkanen, Risto
中科院分区：
文献类型：
--
作者：
Gagen, Mary;McCarroll, Danny;Jalkanen, Risto
利用高度复制的芬兰拉普兰西尔维斯特松三角洲C-13系列研究了树木年轮三角洲C-13系列的非气候趋势。在工业时期，反映大气CO2同位素比率变化的稳定碳同位素的下降趋势在数学上被去除，而不依赖于统计上的下降趋势。然后使用区域曲线标准化（RCS）来识别和去除δ C-13值增加的幼年阶段。这些年代学都表明，在幼年期，碳含量大约减少了1‰，平均增加0.029‰（-1），持续约50年，此后，形成层年龄非常不同的树木在相同的年代学时期内获得了共同的变化。没有证据表明与年龄相关的长期趋势，RCS提供了一种替代方法，可以简单地忽略稳定碳同位素系列的少年部分，从而允许保留更大的样品深度。(C) 2008 Elsevier B.V.版权所有
Non-climatic trends in tree ring delta C-13 series are investigated using highly replicated Pinus sylvestris delta C-13 series from Finnish Lapland. The declining trend in stable carbon isotopes over the industrial period, reflecting changes in the isotopic ratio of atmospheric CO2 is removed mathematically, without recourse to statistical de-trending. Regional Curve Standardisation (RCS) is then used to identify and remove the juvenile phase during which delta C-13 values increase. The chronologies all show approximately 1 parts per thousand depletion in the juvenile phase, with an average rise of 0.029 parts per thousand year(-1) lasting for about 50 years, after which trees of very different cambial age capture common variance over the same chronological period. There is no evidence of long-term age-related trends and RCS provides an alternative to simply omitting the juvenile portion of the stable carbon isotope series, thus allowing greater sample depth to be retained. (C) 2008 Elsevier B.V. All rights reserved.