Spelsberg Sophie, Büntgen Ulf, Homfeld Inga K, Kunz Marcel, Martinez Del Castillo Edurne, Tejedor Ernesto, Torbenson Max, Ziaco Emanuele, Esper Jan
Department of Geography, Johannes Gutenberg University, 55099 Mainz, Germany.
Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland.
Trees (Berl West). 2025;39(1):23. doi: 10.1007/s00468-024-02598-3. Epub 2025 Jan 15.
The temperature sensitivity of maximum latewood density measurements in pine trees from a high-elevation site in the Spanish Pyrenees increases with tree age. Detrending modulates the intensity of the effect.
Tree-rings are the prime archive for high-resolution climate information over the past two millennia. However, the accuracy of annually resolved reconstructions from tree-rings can be constrained by what is known as climate signal age effects (CSAE), encompassing changes in the sensitivity of tree growth to climate over their lifespans. Here, we evaluate CSAE in from an upper tree line site in the Spanish central Pyrenees, Lake Gerber, which became a key location for reconstructing western Mediterranean summer temperatures at annual resolution. We use tree-ring width (TRW) and maximum latewood density (MXD) measurements from 50 pine trees with individual ages ranging from 7 to 406 years. For MXD, temperature sensitivity increases significantly ( < 0.01) with tree age from = 0.31 in juvenile rings with a cambial age < 100 years to = 0.49 in adult rings > 100 years. Similar CSAE are not detected in TRW, likely affected by the overall lower temperature signal ( = 0.45 = 0.81 from 1951 to 2020). The severity of CSAE is influenced by the approach used to remove ontogenetic trends, highlighting the need to assess and consider potential biases during tree-ring standardization. Our findings reveal CSAE to add uncertainty in MXD-based climate reconstructions in the Mediterranean. We recommend studying CSAE by sampling diverse age classes in dendroclimatic field campaigns.
The online version contains supplementary material available at 10.1007/s00468-024-02598-3.
来自西班牙比利牛斯山脉高海拔地区松树的最大晚材密度测量的温度敏感性随树龄增加。去趋势化调节了这种效应的强度。
树木年轮是过去两千年高分辨率气候信息的主要档案。然而，从树木年轮进行逐年分辨率重建的准确性可能会受到所谓气候信号年龄效应（CSAE）的限制，包括树木生长对气候的敏感性在其生命周期内的变化。在这里，我们评估了来自西班牙中比利牛斯山脉上树线站点格伯湖的CSAE，该站点已成为以年分辨率重建地中海西部夏季温度的关键地点。我们使用了50棵松树的年轮宽度（TRW）和最大晚材密度（MXD）测量数据，这些松树的个体年龄从7岁到406岁不等。对于MXD，温度敏感性随着树龄显著增加（<0.01），从形成层年龄<100年的幼龄年轮中的 = 0.31增加到>100年的成年年轮中的 = 0.49。在TRW中未检测到类似的CSAE，这可能受到总体较低温度信号的影响（1951年至2020年期间 = 0.45， = 0.81）。CSAE的严重程度受到用于去除个体发育趋势的方法的影响，这突出了在树木年轮标准化过程中评估和考虑潜在偏差的必要性。我们的研究结果表明，CSAE会增加地中海地区基于MXD的气候重建中的不确定性。我们建议在树木年轮气候学野外活动中通过对不同年龄组进行采样来研究CSAE。
在线版本包含可在10.1007/s00468-024-02598-3获取的补充材料。
