Bettlachstock, 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 two meteorological stations in Bettlachstock in Switzerland where one station is located within a natural mixed forest stand (BTB) with European beech (_Fagus sylvatica_; 170-190 yrs), European silver fir (_Abies alba_; 190 yrs) and Norway spruce (_Picea abies_; 200 yrs) as dominant tree species. A second station is situated in the very vicinity outside of the forest (field station, BTF). The meteorological time series are presented in hourly time resolution of air temperature, relative humidity, precipitation, photosynthetically active radiation (PAR) and wind speed. Bettlachstock is part of the Long-term Forest Ecosystem Research Programme (LWF) established and maintained by the Swiss Federal Research Institute WSL.全球变化背景下，长期森林生态系统研究亟需高质量气象数据。本次发布的长期观测序列数据集，涵盖瑞士贝特拉赫施托克（Bettlachstock）两处气象站近20年的监测数据：其中BTB站坐落于以欧洲山毛榉（*Fagus sylvatica*；树龄170~190年）、欧洲银冷杉（*Abies alba*；树龄190年）与挪威云杉（*Picea abies*；树龄200年）为优势树种的天然混交林分内；另一处BTF野外站则紧邻该森林外围区域。本数据集提供的气象时间序列采用小时级分辨率，包含气温、相对湿度、降水量、光合有效辐射（Photosynthetically Active Radiation, PAR）及风速五项观测要素。贝特拉赫施托克观测场为瑞士联邦森林、雪与景观研究所（WSL）发起并维护的长期森林生态系统研究计划（Long-term Forest Ecosystem Research Programme, LWF）的组成部分。