Long-term Air Temperature Record, Agashashok River, Alaska, 2006-2025

The position of the Arctic treeline is an important regulator of surface energy budgets, carbon cycling and subsistence resources in high latitude environments. It has long been thought that temperature exerts a direct control on growth of treeline trees and the position of the treeline. However, our recent work on white spruce in the Arctic suggests that indirect effects of temperature on tree access to soil nutrients may be of equal or greater importance. Our recent results provide correlative evidence of the importance of winter snow depth as a driver of tree growth. The aim of this project was to experimentally isolate the importance of snow depth and soil nutrient availability and examine the consequences for microbial processes, tree growth and treeline advance.
This dataset contains hourly measurements of air temperature made at 2 meter (m) height on a riverside terrace between June 1, 2006 and August 31, 2025.

北极林线的位置是调控高纬度环境下地表能量收支、碳循环与生计资源的关键因子。长期以来学界普遍认为，温度直接调控林线树木的生长以及林线的位置。然而我们近期针对北极白云杉（white spruce）的研究表明，温度通过间接途径影响树木获取土壤养分的过程，其重要性可能不亚于甚至超过温度的直接调控作用。我们的最新研究结果为冬季积雪深度作为树木生长驱动因子的重要性提供了相关证据。本研究项目旨在通过实验手段分离积雪深度与土壤养分有效性的单独影响，并探究二者对微生物过程、树木生长以及林线扩张的调控效应。
本数据集包含2006年6月1日至2025年8月31日期间，在河边阶地上2米（m）高度处获取的气温逐小时观测数据。