Reconstruction of summer temperatures in interior Alaska from tree-ring proxies: Evidence for changing synoptic climate regimes
Reconstruction of summer temperatures in interior Alaska from tree-ring proxies: Evidence for changing synoptic climate regimes
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DOI：
10.1023/b:clim.0000018501.98266.55
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发表时间：
2004-03-01
期刊：
影响因子：
4.8
通讯作者：
Wilmking, M
中科院分区：
文献类型：
--
作者：
Barber, VA;Juday, GP;Wilmking, M
阿拉斯加内陆白云杉的最大晚材密度和增量(13)C分辨率被用来重建18001996年期间费尔班克斯夏季(5月至8月)的温度，这是该地区最早的高分辨率重建之一。这种晚材密度和增量(13)C分辨率的组合可以解释1906-1996年有记录的夏季气温变化的59.9%。200年。重建的特点是有7个十年尺度的制度。1816年、1834年、1879年、1916年、1937年和1974年的气候变化是突然的，似乎是天气尺度气候变化的结果。重建期间(1800-1996年)夏季平均气温为13.49摄氏度。在仪器记录期间(1903-1996年)，重建资料和记录资料的夏季平均气温均为13.31℃。最冷的时段是1916-1937年(12.62摄氏度)，最热的时段是1974-1996年(14.23摄氏度)。这次重建与这一时期的北半球温度记录不同，特别是因为重建了1834-1851年(14.24摄氏度)和1862-1879年(14.19摄氏度)的阿拉斯加内陆暖期，以及20世纪初的冷期(1917-1974)。我们展示了其他树木年轮数据，这些数据支持我们重建这些暖期。研究人员探索了其他假设，包括树木生长对场地的自生效应、树木敏感性的改变，或者温度和降水的新颖组合，虽然不能排除它们是19世纪异常温暖的重建的贡献者，但现有数据并不支持它们。白云杉径向生长与重建的夏季温度高度相关，温度似乎是该系统碳吸收的可靠指标。
Maximum latewood density and delta(13)C discrimination of Interior Alaska white spruce were used to reconstruct summer (May through August) temperature at Fairbanks for the period 18001996, one of the first high-resolution reconstructions for this region. This combination of latewood density and delta(13)C discrimination explains 59.9%a of the variance in summer temperature during the period of record 1906-1996. The 200-yr. reconstruction is characterized by 7 decadal-scale regimes. Regime changes are indicated at 1816, 1834, 1879, 1916, 1937, and 1974, are abrupt, and appear to be the result of synoptic scale climate changes. The mean of summer temperature for the period of reconstruction (1800-1996) was 13.49degreesC. During the period of instrument record (1903-1996) the mean of summer temperature was 13.31degreesC for both the reconstruction and the recorded data. The coldest interval was 1916-1937 (12.62degreesC) and the warmest was 1974-1996 (14.23degreesC) for the recorded data. The reconstruction differs from records of northern hemisphere temperatures over this period, especially because of Interior Alaska warm periods reconstructed from 1834 to 1851 (14.24degreesC) and from 1862 to 1879 (14.19degreesC) and because of the cool period in the early part of the 20th century (1917-1974). We show additional tree ring data that support our reconstruction of these warm periods. Alternate hypotheses involving autogenic effect of tree growth on the site, altered tree sensitivity, or novel combinations of temperature and precipitation were explored and while they cannot be ruled out as contributors to the anomalously warm 19th century reconstruction, they were not supported by available data. White spruce radial growth is highly correlated with reconstructed summer temperature, and temperature appears to be a reliable index of carbon uptake in this system.