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标题：Climatic Signals in δ 13 C and δ 18 O of Tree-rings from White Spruce in the Mackenzie Delta Region, Northern Canada
其他标题：Climatic Signals in δ 13 C and δ 18 O of Tree-rings from White Spruce in the Mackenzie Delta Region, Northern Canada
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作者：Trevor J. Porter ; Michael F. J. Pisaric ; Steven V. Kokelj 等
期刊名称：Arctic, Antarctic, and Alpine Research
印刷版ISSN：1523-0430
电子版ISSN：1938-4246
出版年度：2009
卷号：41
期号：4
页码：497-505
DOI：10.1657/1938-4246-41.4.497
摘要：Here we present the first tree-ring series (1850–2003) of stable carbon (δ 13 C) and oxygen (δ 18 O) isotope ratios from a high-latitude treeline site in northwestern Canada. Both δ 13 C and δ 18 O were measured at annual resolution from whole-ring α-cellulose of three white spruce trees ( Picea glauca [Moench] Voss) growing in the Mackenzie Delta. There is a strong positive association between δ 13 C and maximum summer temperatures. This relation likely results from the influence of temperature-induced drought stress on stomatal conductance. Mean summer relative humidity is also significantly correlated, inversely, with δ 13 C reflecting its direct influence on stomatal conductance. The δ 18 O record is strongly and positively correlated with early-spring to mid-summer minimum temperatures likely owing to the temperature dependence of δ 18 O in precipitation and uptake of this water during the growing season. Mean summer relative humidity is also significantly and inversely correlated with δ 18 O due to leaf water evaporative enrichment. Our δ 13 C and δ 18 O records contain a large amount of climate-driven variability indicating their considerable potential to infer past climate changes in the Mackenzie Delta region.