REVIEW OF THE SCIENTIFIC SUPERVISOR OF THE FINAL GRADUATION WORK Topic of the final graduation work_ Methane flux dynamics in polygonal tundra investigated by the eddy covariance method___________________________________ Author (student)_ Viktoriia Pastukhova _________________________________________ Educational program Cold Regions Environmental Landscapes Integrated Science (CORELIS) Level: Master's program Scientific Supervisor Irina Fedorova, Dr., PhD_____________________________________ (Full name, academic title, academic degree)  Noted advantages of work Writing her master's thesis, Pastukhova V.A. used for the analysis a unique array of data obtained as a result of field work on Samoylov island by German-Russian research team. With the task assigned to her, Pastukhova V.A. successfully coped using mathematical modeling techniques to data processing, and also demonstrated a profound understanding of the research problem in interpreting the results obtained by her.  During her Master's, Pastukhova V.A. attended the Russian-German scientific school for scholars of the Vernadsky Foundation (as a scholarship student) in Sochi, as well as the International scientific school for methane research in Tromsø, Norway. V.A. Pastukhova published about 15 abstracts and theses of conferences of various levels and 1 article in the journal from the list of VAK.  Noted disadvantages of work In the Introduction part of the thesis there are a number of repetitions, some spelling and syntactic errors, which, however, does not affect the general perception of meaning and does not detract from the dignity of the work, since the author is not a native speaker of the English language. Supervisor's conclusion Pastukhova V.A. during the writing of the master's thesis showed herself as a thoughtful researcher and a fully formed specialist who is able to solve scientific problems independently and present them according to international requirements, and deserves to be awarded a master's degree.  \  Supervisor  (Dr. I. Fedorova)  «__11_» ____June______2018 year.