Variability of sea ice thickness and concentration in the twentieth century

Regular measurements of Arctic ice thickness began approximately in the middle of the 1930s in the vicinity of a number of polar stations, some of which were closed in the 1990s. To investigate the changes in landfast ice thickness for this study, we chose 11 stations with approximately equal lengths of observational time series. Five of these stations were located in the Kara Sea (Beliy Island, Dikson Island, Uyedineniya Island, Cape Sterlegov, and Cape Cheluskin), and the others in the Laptev Sea (Tiksi Bay, Kotel’ny Island, Sannikov Island), East-Siberian Sea (Cape Shalaurov, Chetyrekhstolbovoy Island) and in the Chukchi Sea (Wrangel Island).