Alpthal, Switzerland: Long-term forest meteorological data from the Long-term Forest Ecosystem Research Programme (LWF), from 1997 onwards

High quality meteorological data are needed for long-term forest ecosystem research, particularly in the light of global change. The long-term data series published here comprises almost 20 years of measurements for one meteorological station in Alpthal in Switzerland which is located within a natural coniferous forest (ALB) with Norway spruce (_Picea abies_; 180-230 yrs) as dominant tree species. The meteorological time series are presented in hourly time resolution of air temperature, relative humidity, precipitation, photosynthetically active radiation (PAR) and wind speed. Alpthal is part of the Long-term Forest Ecosystem Research Programme (LWF) established and maintained by the Swiss Federal Research Institute WSL.长期森林生态系统研究亟需高质量气象数据，在全球变化背景下这一需求尤为显著。本次发布的长期数据集序列包含瑞士阿尔普塔尔（Alpthal）一处气象站近20年的观测记录，该站点坐落于以挪威云杉（*Picea abies*；树龄180-230年）为优势树种的天然针叶林（ALB）内。本气象时间序列以小时分辨率呈现了气温、相对湿度、降水量、光合有效辐射（photosynthetically active radiation，PAR）与风速等观测指标。阿尔普塔尔站点隶属于由瑞士联邦森林、雪与景观研究所（WSL）建立并维护的长期森林生态系统研究计划（Long-term Forest Ecosystem Research Programme，LWF）。