Air Temperature, Soil Temperature, Precipitation, Snow Depth at Long Term Tree Growth Sites; 1968-Present : Weekly

Part of the Long Term Tree Growth study. This dataset is an accumulation of various manual measurements made on a weekly to monthly basis. It originally included snow stakes, rain buckets, max/min thermometers and a series of soil temperature sensors. Over the years equipment has changed. The soil temperature sensors exceeded their field life during the 1990's and were dropped from the study. In 2001 logging air temperature and relative humidity sensors were installed and those measurements were discontinued. In 2002 logging rain gauges were installed to replace the manual buckets. Both styles were during that growing season and the manual buckets were removed before the 2003 field season. All that remains active in this dataset are the snow stake measurements.

本数据集属于长期树木生长研究（Long Term Tree Growth study）的一部分。该数据集汇集了一系列按周至月为周期开展的人工观测数据，最初包含雪桩（snow stakes）、雨量桶（rain buckets）、最高/最低温度计（max/min thermometers）以及多组土壤温度传感器（soil temperature sensors）。多年来观测设备历经多次调整：20世纪90年代，土壤温度传感器超出野外使用寿命，被从该研究中移除；2001年，研究团队加装了自动记录式气温与相对湿度传感器，此后该类温湿度观测便停止进行；2002年，自动记录式雨量计被安装以替代手动雨量桶，两种设备在此后的生长季并行使用，并于2003年野外观测季开始前移除了手动雨量桶。目前本数据集仅保留雪桩观测数据。