Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA
Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA
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作为美国阿拉斯加州朱诺气候记录的黄-雪松蓝强度树轮年表
DOI:
10.1139/cjfr-2018-0525
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发表时间:
2019
影响因子:
2.2
通讯作者:
Oelkers, Rose
中科院分区:
文献类型:
--
作者:
Wiles, Gregory C.;Charlton, Joshua;Wilson, Rob J.S.;D’Arrigo, Rosanne D.;Buma, Brian;Krapek, John;Gaglioti, Benjamin V.;Wiesenberg, Nicholas;Oelkers, Rose
This is the first study to generate and analyze the climate signal in blue intensity (BI) tree-ring chronologies from Alaska yellow-cedar (Callitropsis nootkatensis(D. Don) Oerst. ex D.P. Little). The latewood BI chronology shows a much stronger temperature sensitivity than ring width and can thus provide information on past climate. The well-replicated BI chronology exhibits a positive January–August mean maximum temperature signal for 1900–1975, after which it loses temperature sensitivity following the 1976–1977 shift in northeastern Pacific climate. The positive temperature response appears to recover and remains strong for the most recent decades, but the coming years will continue to test this observation. This temporary loss of temperature sensitivity from about 1976 to 1999 is not evident in ring width or in a change in forest health but is consistent with prior work linking cedar decline to warming. A confounding factor is the uncertain influence of a shift in color variation from the heartwood–sapwood boundary. Future expansion of the yellow-cedar BI network and further investigation of the influence of the heartwood–sapwood transitions in the BI signal will lead to a better understanding of the utility of this species as a climate proxy.
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DOI:
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发表时间:
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作者:
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