Spatial and Temporal Variability of Permafrost in the Western Part of the Russian Arctic oleh Galina Malkova, Dmitry Drozdov, Alexander Vasiliev, Andrey Gravis, Gleb Kraev, Yuriy Korostelev, Kirill Nikitin, Pavel Orekhov, Olga Ponomareva, Vladimir Romanovsky, Marat Sadurtdinov, Alexandr Shein, Andrey Skvortsov, Maria Sudakova, Andrey Tsarev