Summer temperature variability since 1730 CE across the low-to-mid latitudes of western North America from a tree ring blue intensity network

QUATERNARY SCIENCE REVIEWS

卷:267

Article

Heeter, Karen J.¹  Harley, Grant L.¹  Maxwell, Justin T.²  Wilson, Rob J.³  Abatzoglou, John T.⁴  Rayback, Shelly A.⁵  Rochner, Maegen L.⁶  Kitchens, Katherine A.⁷ 

[1] Univ Idaho, Moscow, ID 83843 USA

[2] Indiana Univ, Bloomington, IN USA

[3] Univ St Andrews, St Andrews, Fife, Scotland

[4] Univ Calif Merced, Merced, CA USA

[5] Univ Vermont, Burlington, VT USA

[6] Univ Louisville, Louisville, KY 40292 USA

[7] Univ British Columbia, Vancouver, BC, Canada

关键词: Dendrochronology;    Climate change;    Latewood blue intensity;    Temperature reconstruction;   

DOI  :  10.1016/j.quascirev.2021.107064

来源: Elsevier

【 摘 要 】

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 (T-max) in the low-to-mid latitudes (30 degrees-50 degrees 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 engelmannii Parry 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 T-max. From this network we present 4 regional T-max reconstructions, 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. (C) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

Free