Snow albedo over artificial macroscopic surface roughness

In situ measurements of albedo were acquired in the French Alps over smooth and rough snow surfaces. The roughness features were artificially created by pushing the snow down a few centimeter with rectangular and triangular rulers (2.5 m long) at regular spacing over a 2.5 m wide area. Spectral albedo over the rough area was recorded just after the creation, or for some experiment regularly over a few hours after the creation. A nearby smooth area was also measured to provide a reference. It is worth noting that despite our effort to search for flat areas, all the measured areas have small yet non-negligible slope. Ancillary data include spectral diffuse / total incident radiation ratio acquired just after each albedo measurements, slope information and other metadata. The accompanying paper provides full details of the roughness and experimental conditions.

本数据集包含在法国阿尔卑斯山针对光滑与粗糙雪面开展的反照率（albedo）原位测量。实验中，研究人员在2.5米宽的区域内以固定间距使用长2.5米的矩形及三角尺将积雪下压数厘米，以此人工构建粗糙雪面特征。粗糙雪面的光谱反照率会在构建完成后即刻记录，部分实验还会在构建后的数小时内定期进行数据采集。同时，研究人员会对附近的光滑雪面进行测量以作为对照基准。值得注意的是，尽管团队尽力搜寻平坦区域，但所有被测雪面均存在虽小却不可忽略的坡度。本数据集的辅助数据包含每次反照率测量后即刻获取的光谱漫射/总入射辐射比、坡度信息及其他元数据。配套论文详细阐述了本次实验的粗糙雪面构建方案与全部实验条件细节。