Annett Bartsch and others have just published an updated Circumarctic Landcover Units map. It now also includes Northern Scandinavia and Southern Greenland and many other areas have been reprocessed, representing an important addition to circumarctic remote sensing data.
You can access and download all the data on the open source Zenodo platform here
It includes an axillary dataset with dates used for each Sentinel-2 granule area, a quality indicator and reprocessing status.
Documentation is in the included Product User Guide and in: Bartsch, A., Efimova, A., Widhalm, B., Muri, X., von Baeckmann, C., Bergstedt, H., Ermokhina, K., Hugelius, G., Heim, B., and Leibman, M. (2024): Circumarctic land cover diversity considering wetness gradients, Hydrol. Earth Syst. Sci., 28, 2421–2481, https://doi.org/10.5194/hess-28-2421-2024.