BernClim data Plant phenology, snow duration, fog frequency

The BernClim data includes seasonal observations on plant phenology, snow cover and fog collected by volunteer observers from 1970-2011. The following were recorded: — Plants: Entry of the general flower (50 % of the flowers open) for hazel, dandelion and apple tree as well as general leaf discoloration of the beech (min. 50 % of the leaves yellow). — Snow: Snow cover available on the observation surface — fog: Days with nebulae (0-200 m or 200-1 000 m) Based on the observation data, linear regressions were carried out depending on the altitude, based on which comprehensive grid data about the canton of Bern were calculated.伯尔尼气候（BernClim）数据集包含1970年至2011年间由志愿观测者采集的植物物候（plant phenology）、积雪覆盖与雾况季节性观测数据。观测记录内容如下：—— 植物类：榛树、蒲公英与苹果树的普遍开花期（即50%花朵开放时），以及山毛榉的普遍落叶期（即至少50%叶片变黄时）；—— 积雪类：观测地表的积雪覆盖状况；—— 雾况：出现雾（能见度区间0-200米或200-1000米）的天数。基于上述观测数据，研究人员以海拔为自变量开展线性回归分析，并以此为基础生成了覆盖伯尔尼州的综合格点数据集。