Tree-ring isotopes adjacent to Lake Superior reveal cold winter anomalies for the Great Lakes region of North America
Tree-ring isotopes adjacent to Lake Superior reveal cold winter anomalies for the Great Lakes region of North America
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DOI：
10.1038/s41598-019-40907-w
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发表时间：
2019-03
影响因子：
4.6
通讯作者：
S. Voelker;S. Wang;T. Dawson;J. Roden;C. Still;F. Longstaffe;A. Ayalon
中科院分区：
文献类型：
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作者：
S. Voelker;S. Wang;T. Dawson;J. Roden;C. Still;F. Longstaffe;A. Ayalon
苏必利尔湖附近白松树的树轮碳同位素识别(Δ13C)和氧同位素(δ18O)显示出该地区第一个具有年际分辨率的冬季特有的古气候重建的潜力。1976年至2015年的同位素特征与前期冬季最低温度(Tmin)、苏必利尔湖峰值冰盖以及包括北美偶极子在内的区域至大陆尺度冬季气压变化密切相关。苏必利尔湖巨大的热惯性是冬季条件与树木年轮Δ13C和δ18O信号之间独特联系的基础，这些信号来自位于苏必利尔湖附近的树木的下一个生长季。通过组合这些信号，我们证明了重建Tmin、冰盖和大陆尺度大气环流模式(r ≥ 0.65，P <； 0.001)的可行性。
Tree-ring carbon isotope discrimination (Δ13C) and oxygen isotopes (δ18O) collected from white pine (Pinus strobus) trees adjacent to Lake Superior show potential to produce the first winter-specific paleoclimate reconstruction with inter-annual resolution for this region. Isotopic signatures from 1976 to 2015 were strongly linked to antecedent winter minimum temperatures (Tmin), Lake Superior peak ice cover, and regional to continental-scale atmospheric winter pressure variability including the North American Dipole. The immense thermal inertia of Lake Superior underlies the unique connection between winter conditions and tree-ring Δ13C and δ18O signals from the following growing season in trees located near the lake. By combining these signals, we demonstrate feasibility to reconstruct variability in Tmin, ice cover, and continental-scale atmospheric circulation patterns (r ≥ 0.65, P < 0.001).