Vol. XXV, No. 2 (March–April 2021) Full issue: view (pdf viewer) download (.pdf) CONTENTS GEOLOGICAL CRYOGENIC PROCESSES AND FORMATIONS Sizov O.S., Yurtaev A.A., Soromotin A.V., Koptseva E.M., Volvakh A.O., Abakumov E.V., Berdnikov N.M., Prikhodko N.V., Guryev D.S. Reconstruction of the formation history of the peat plateau in the lower reaches of the Nadym River SURFACE AND GROUND WATERS IN TERRESTRIAL PERMAFROST REGION Makarov V.N., Spektor V.B. Thermal spring at the Pole of Cold (Eastern Yakutia) METHODS OF CRYOSPHERIC RESEARCH Gorelik J.B., Khabitov A.K. Affectivity of surface cooling of frozen ground in connection with mechanism of temperature shift formation SNOW COVER AND GLACIERS Fedorov V.M., Grebennikov P.B. Implications of changes in insolation characteristics for long-term sea ice extent dynamics in the Northern Hemisphere DISCUSSION Vasil’chuk Yu.K., Vasil’chuk A.C. Air January paleotemperature reconstruction 48–15 calibrated ka BP using oxygen isotope ratios from Zelyony Mys Yedoma Galanin A.A. About the incorrectness of Yu.K. Vasil’chuk’s method for the reconstruction of paleotemperatures using isotope composition of wedge ice. Review of the article by Yu.K. Vasil’chuk, A.C. Vasil’chuk “Air January paleotemperature reconstruction 48–15 calibrated ka BP using oxygen isotope ratios from Zelyony Mys Yedoma” CHRONICLE Melnikov V.P., Sadurtdinov M.R., Nesterov A.N., Fedorov R.Yu., Ustinova E.V. To the anniversary of the Earth Cryosphere Institute, Tyumen Scientific Centre SB RAS