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A multi-century Sierra Nevada snowpack reconstruction modeled using upper-elevation coniferous tree rings (California, USA)
The Holocene ( IF 1.6 ) Pub Date : 2020-05-12 , DOI: 10.1177/0959683620919972
Kai Lepley 1 , Ramzi Touchan 1 , David Meko 1 , Eylon Shamir 2 , Rochelle Graham 2 , Donald Falk 1, 3
Affiliation  

Snowpack in the Sierra Nevada Mountains accounts for around one-third of California’s water supply. Melting snow provides water into dry summer months characteristic of the region’s Mediterranean climate. As climate changes, understanding patterns of snowpack, snowmelt, and biological response is critical in this region of agricultural, recreational, and ecological value. Here we investigated the relationships between tree rings of montane conifer trees (Tsuga mertensiana, Abies magnifica, Abies concolor, Calocedrus decurrens, Juniperus occidentalis, and Pinus ponderosa) and regional climate indices with the goal of reconstructing April 1 snow-water equivalent (SWE) in the North Fork American River watershed of the Sierra Nevada. Chronologies were positively correlated with April 1 SWE of the year prior to ring formation. Temporal trends in correlation between tree-ring chronologies and climate indices indicate strengthening tree growth response to climate over time. We developed a skillful, nested reconstruction for April 1 SWE, 1661–2013. Variability of the reconstruction is within the envelope of 20th and 21st-century variability; however, the 2015 record low snowpack is unprecedented in the tree-ring record, as in results from previous studies. Future research should focus on integrating modern snow sensor data into paleoclimate research and understanding mechanistic linkages between snow and tree growth response.

中文翻译:

使用高海拔针叶树年轮(美国加利福尼亚州)建模的多世纪内华达山脉积雪重建

内华达山脉的积雪约占加州供水的三分之一。融化的雪为该地区地中海气候特征的干燥夏季提供水源。随着气候变化,了解积雪、融雪和生物反应的模式在这一具有农业、娱乐和生态价值的地区至关重要。在这里,我们调查了山地针叶树(Tsuga mertensiana、Abies magnifica、Abies concolor、Calocedrus decurrens、Juniperus occidentalis 和 Pinus黄松)的年轮与区域气候指数之间的关系,目的是重建 4 月 1 日的雪水当量 (SWE)在内华达山脉的北叉美洲河流域。年表与环形成前一年的 4 月 1 日 SWE 呈正相关。树木年轮年表与气候指数之间相关性的时间趋势表明,随着时间的推移,树木生长对气候的响应正在加强。我们为 1661-2013 年 4 月 1 日 SWE 开发了一种巧妙的嵌套重建。重建的可变性在 20 世纪和 21 世纪可变性的范围内;然而,与之前的研究结果一样,2015 年创纪录的低积雪在树木年轮记录中是前所未有的。未来的研究应侧重于将现代雪传感器数据整合到古气候研究中,并了解雪与树木生长响应之间的机制联系。重建的可变性在 20 世纪和 21 世纪可变性的范围内;然而,与之前的研究结果一样,2015 年创纪录的低积雪在树木年轮记录中是前所未有的。未来的研究应侧重于将现代雪传感器数据整合到古气候研究中,并了解雪与树木生长响应之间的机制联系。重建的可变性在 20 世纪和 21 世纪可变性的范围内;然而,与之前的研究结果一样,2015 年创纪录的低积雪在树木年轮记录中是前所未有的。未来的研究应侧重于将现代雪传感器数据整合到古气候研究中,并了解雪与树木生长响应之间的机制联系。
更新日期:2020-05-12
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