Reflectance measurements - CCT. This dataset contains spectral reflectance measurements collected in situ during the peak of the summer growing season (July) for Bistorta vivipara, Cassiope tetragona, Oxyria digyna, Saxifraga oppositifolia, Carex rupestris, Dryas octopetala, and Salix polaris. Reflectance data are fundamental for assessing the optical properties of the vegetation and deriving key spectral indices (e.g., Normalized Difference Vegetation Index (NDVI), PRI).

This dataset contains leaf stable isotope (\u03b4\u00b9\u00b3C, \u03b4\u00b9\u2075N) and elemental composition (carbon and nitrogen content, C:N ratio) data for two dominant high-arctic dwarf shrubs, Dryas octopetala L. and Salix polaris Wahlenb. Samples were collected repeatedly during the peak of the growing season (July) from 2021 to 2024 at a continuous permafrost site in the Brogger Peninsula, near Ny-Alesund, Svalbard