8 Data Availability
All data used in this paper are freely available online. MOD10A2 is available from NSIDC at https://nsidc.org/data/MOD10A2; ERA Interim fields from ECMWF at https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era-interim; Northern hemisphere atmospheric indices from NOAA climate prediction center at https://www.cpc.ncep.noaa.gov/data/teledoc/telecontents.shtml; ground based weather observations from NOAA Global Historical Climatology Network at https://www.ncdc.noaa.gov/data-access/land-based-station-data/land-based-datasets/global-historical-climatology-network-ghcn and the ASTER GDEM version 2 from NASA Earthdata at https://search.earthdata.nasa.gov/search/