标题: Tree-ring blue intensity and climate sensitivity: Exploring site and method-specific variations in southern Yukon, Canada
作者: Zheng, YH (Zheng, Yonghong); Wilson, R (Wilson, Rob); Wang, MJ (Wang, Mingjun); Reid, E (Reid, Emily)
来源出版物: DENDROCHRONOLOGIA 卷: 94 文献号: 126420 DOI: 10.1016/j.dendro.2025.126420 Published Date: 2025 DEC
摘要: Tree-ring blue intensity (BI), a substitute for tree-ring density, has gained increasing attention in recent years as a robust tree-ring proxy for climate reconstruction. However, it still presents considerable uncertainty due to its status as a relatively new tree-ring parameter with limitations related to sample discolouration issues and image resolution. This study aims to identify the climate information embedded in different tree-ring parameters measured from white spruce samples and examine whether the relationship between tree-ring parameters and climate is impacted by altitude, image resolution, and BI data collection method. By measuring ring width (RW), earlywood blue intensity (EWBI), latewood blue intensity (LWBI), and delta blue intensity (DBI) at higher (1065 m a.s.l.) and lower (965 m a.s.l.) sites in southern Yukon, we found that LWBI and DBI show a significantly stronger climate signal over RW, especially at high frequencies, aligning with previous climate studies. The upper site performed better than the lower site, agreeing with the expectation that the climate response will increase for sites closer to tree-line. While higher-resolution methods like the Advanced Tree-Ring Image Capturing System (ATRICS) did not outperform the scanner method, further testing is needed. Additionally, both the mean of sorted pixels (Pix) method and the mean of slices (Slc) method have their strength in DBI chronologies, but further testing is recommended to optimize data selection methods.
作者关键词: Tree-ring blue intensity; Dendroclimatology; ATRICS; Southern Yukon
KeyWords Plus: SUMMER TEMPERATURE RECONSTRUCTION; FAGUS-SYLVATICA L.; NORTHERN-HEMISPHERE; LATEWOOD DENSITY; EARLYWOOD; GROWTH; DENDROCLIMATOLOGY; VARIABILITY; GRADIENTS; ALPS
地址: [Zheng, Yonghong; Wang, Mingjun] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
[Wilson, Rob; Reid, Emily] Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Scotland.
通讯作者地址: Zheng, YH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.
影响因子：2.3
