Dataset Used in the Study 'Rising Temperatures as the Primary Driver of Decreased Sea Ice Concentration in the Northern Hemisphere

The ice_type dataset, provided by ORAS5, is the Meereisalter für die Arktis von NSIDC dataset, updated weekly. It covers a geographical range from 48.4°N to 90°N and utilizes the EASE projection coordinate system. In this study, the dataset is used to classify sea ice into multi-year ice, first-year ice, and open water. The SIC dataset, also released by ORAS5, is the Polare Meereiskonzentration von ASI-SSMI Daten dataset, which is updated daily. It covers latitudinal regions approximately above 45°N and 45°S, using a polar stereographic grid coordinate system based on the NSIDC polar projection. The Climate dataset consists of ERA5 hourly data on single levels from 1940 to present, provided by the Copernicus Climate Change Service (C3S) of ECMWF, including 2m temperature and sea surface temperature. All datasets have been resampled to a spatial resolution of 0.25°. The selected study period is from 2001 to 2020, with sea ice data extending to include January to March of 2021.