Micro-scale analysis of tree-ring δ18O and δ13C on α-cellulose spline reveals high-resolution intra-annual climate variability and tropical cyclone activity

被引:46
作者
Li, Zheng-Hua [1 ,4 ]
Labbe, Nicole [2 ]
Driese, Steven G. [3 ]
Grissino-Mayer, Henri D. [4 ,5 ]
机构
[1] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA
[2] Univ Tennessee, Ctr Renewable Carbon, Dept Forestry Wildlife & Fisheries, Knoxville, TN 37996 USA
[3] Baylor Univ, Dept Geol, Waco, TX 76798 USA
[4] Univ Tennessee, Dept Geog, Knoxville, TN 37996 USA
[5] Univ Tennessee, Initiat Quaternary Paleoclimate Res, Knoxville, TN 37996 USA
关键词
Tree ring; Isotope; Carbon; Oxygen; Hurricane; Climate; OXYGEN-ISOTOPE RATIOS; STABLE-CARBON; C-13/C-12; VARIATIONS; STOMATAL RESPONSES; FAGUS-SYLVATICA; WOOD; HYDROGEN; GROWTH; TEMPERATURE; HUMIDITY;
D O I
10.1016/j.chemgeo.2011.02.015
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
High-resolution analysis of stable carbon and oxygen isotopic composition (delta C-13 and delta O-18) of tree-ring alpha-cellulose has been increasingly in demand for the study of climate seasonality, droughts, and tropical cyclone (hurricane) activity. The peeling-grinding method commonly used for tree-ring alpha-cellulose preparation is both time-consuming and labor-intensive, and often results in cross-tracheid sampling that masks high-frequency intra-annual climate signals and short-term climate events. Here, we present a new method by extracting tree-ring alpha-cellulose directly from wholewood spline that omits the peeling-grinding step, and allows for micro-scale delta C-13 and delta O-18 analysis that facilitates high-resolution seasonal climate study. This ultrasound-assisted non-destructive extraction method has significantly increased the output of tree-ring alpha-cellulose preparation while retaining the wood cell fabric. Wood cell-wall fibers collected from the alpha-cellulose spline were directly loaded into pre-weighed silver (or tin) capsules and packed, after oven drying, for stable oxygen (or carbon) isotope analysis. A 3.045-mm annual ring subdivided over 26 sections for delta C-13 and delta O-18 analysis revealed remarkable intra-annual isotopic variations (1.62 parts per thousand for delta C-13, and 5.85 parts per thousand for delta O-18). The intra-annual delta C-13 values inversely covary with the seasonal precipitation pattern, suggesting moisture regulation on tree-ring delta C-13 variations. The high-resolution delta O-18 analysis unravels tropical cyclone activities (Hurricanes Frances and Ivan in 2004) that are characterized by an abrupt decline in delta O-18 values by 2.6 parts per thousand with a "V-shape" pattern in tree-ring latewood. An algorithm is developed for establishing regional patterns of tree-ring seasonal delta C-13 and delta O-18 for the study of the mean state of climate seasonality and its anomalies. Published by Elsevier B.V.
引用
收藏
页码:138 / 147
页数:10
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