Summer temperature variability since 1730 CE across the low-to-mid latitudes of western North America from a tree ring blue intensity network
Summer temperature variability since 1730 CE across the low-to-mid latitudes of western North America from a tree ring blue intensity network
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DOI：
10.1016/j.quascirev.2021.107064
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发表时间：
2021-09
影响因子：
4
通讯作者：
K. J. Heeter;G. Harley;Justin T. Maxwell;R. Wilson;J. Abatzoglou;Shelly A Rayback;Maegen L. Rochner;Katherine A. Kitchens
中科院分区：
文献类型：
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作者：
K. J. Heeter;G. Harley;Justin T. Maxwell;R. Wilson;J. Abatzoglou;Shelly A Rayback;Maegen L. Rochner;Katherine A. Kitchens
过去千年的区域气温重建为持续的气候变化提供了关键背景，但这些重建在最近一段时间内受到暂时限制，或者在世界许多地区都没有。我们演示了使用晚材蓝色强度 (LWB) 来重建北美西部中低纬度 (30°-50°N) 的当年生长（温暖）季节最高温度 (Tmax)。我们提出了一个新的树木年轮网络，由 26 个 LWB 年表组成，这些年表是从美国西部的活体高海拔英格曼云杉 (Picea engelmanniiParry ex Engelm.) 采样而来。 LWB 参数与生长季节 Tmax 具有很强的正相关性 (r= 0.65–0.73) 并且在时间上稳定。通过该网络，我们呈现了 4 个区域 Tmax 重建，描述了过去 4 个世纪中北美西部从墨西哥北部到不列颠哥伦比亚省南部的区域温度历史。我们对这 4 个温度重建的比较突出了随时间变化的区域温度趋势的空间模式。这些重建为北半球的树木年轮温度代理网络提供了重要的更新和增加的数据点密度。我们强调在低纬度和中纬度树线上部位置使用蓝色强度方法，以增加北半球纬度越来越低的强烈温度敏感记录的存在。
Regional reconstructions of air temperature over the past millennium provide critical context for ongoing climate change, but they are temporally limited in the recent period or absent for many parts of the world. We demonstrate the use of latewood blue intensity (LWB) to reconstruct current-year growing (warm) season maximum temperatures (Tmax) in the low-to-mid latitudes (30°-50°N) of western North America. We present a new tree ring network comprised of 26 LWB chronologies developed from living, high-elevation Engelmann spruce (Picea engelmanniiParry ex Engelm.) sampled across the western United States. The LWB parameter shows strong, positive (r= 0.65–0.73), and temporally-stable correlations with growing season Tmax. From this network we present 4 regional Tmaxreconstructions, which characterize regional temperature histories across western North America from northern Mexico to southern British Columbia over the past 4 centuries. Our comparison of these 4 temperature reconstructions highlights the spatial patterns of regional temperature trends throughout time. These reconstructions provide important updates and increased data point density to the tree ring temperature proxy network of the Northern Hemisphere. We highlight the use of blue intensity methods at both low- and mid-latitude upper tree line locations to increase the presence of strongly temperature-sensitive records at increasingly lower latitudes of the Northern Hemisphere.