Winter-spring minimum temperature variations inferred from tree-ring δ^(13)C in southeastern China  

作　　者：Wenli Li Feifei Zhou Heng Zhang Keyan Fang 

机构地区：[1]Key Laboratory of Humid Subtropical Eco-Geographical Process(MOE),College of Geographic Sciences,Fujian Normal University,Fuzhou 350007,People’s Republic of China

出　　处：《Journal of Forestry Research》2024年第5期182-190,共9页林业研究（英文版）

基　　金：supported by the National Science Foundation of China(42101082);the Science Foundation of Fujian Province(2023J01496).

摘　　要：Long-term temperature variations inferred from high-resolution proxies provide an important context to evaluate the intensity of current warming.However,tem-perature reconstructions in humid southeastern China are scarce and particularly lack long-term data,limiting us to obtain a complete picture of regional temperature evolution.In this study,we present a well-verified reconstruction of winter-spring(January–April)minimum temperatures over southeastern China based on stable carbon isotopic(δ^(13)C)records of tree rings from Taxus wallichiana var.mairei from 1860 to 2014.This reconstruction accounted for 56.4%of the total observed variance.Cold periods occurred during the 1860s–1910s and 1960s–1970s.Although temperatures have had an upward trend since the 1920s,most of the cold extremes were in recent decades.The El Niño-Southern Oscillation(ENSO)variance acted as a key modulator of regional winter-spring minimum temperature variability.However,teleconnections between them were a nonlinear process,i.e.,a reduced or enhanced ENSO variance may result in a weakened or intensified temperature-ENSO relationship.

关 键 词：Tree rings Carbon isotope Southeastern China Extreme coldness El nino-southern oscillation 

分 类 号：S718.5[农业科学—林学]