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MAIN PAGE > Journal "Arctic and Antarctica" > Rubric "Lanscapes of Cold Regios"
Lanscapes of Cold Regios
Budantseva N.A., Chizhova J.N., Bludushkina L.B., Vasil'chuk Y.K. - Stable isotopes of oxygen, hydrogen, and carbon and the age of palsa nearby the urban-type settlement of Yeletsky, northeast of Bolshezemelskaya tundra pp. 38-56


Abstract: This article considers the migration frost mounds (palsa) in the settlement of Yeletsky in the northeast of Bolshezemelskaya tundra. The new radiocarbon dating on the frost mounds of various size and different stages of development within the boundaries of massif explored by the authors in 2000 and 2015. The work meticulously examines the representative 3m high frost mound with no signs of destruction, covered with peat having capacity over 1m. The object of the research is defined by the goal to characterize the conditions of peat accumulation and identify the moisture sources that form the upper part of the ice core. For the radiocarbon dating was selected the thawed peat on the top or shoulder of the mound. In the shafts was minutely (at intervals of 5-10cm) selected the peat for identifying the concentration of carbon and nitrogen and isotopic composition of carbon and nitrogen. From the bottom of the shaft using the electric ice auger MORA-ICE was drilled the wellbore in frozen peat and the underlying frozen loam, as well as selected the ice lenses. The determination of isotopic composition of oxygen and hydrogen of ice were conducted using the mass spectometer Delta-V; radiocarbon dating of the peat carried out in laboratory of archeological technology of the Institute of Material Culture of the Russian Academy of Sciences. The scientific novelty consists in the comprehensive approach towards exploring the peat deposit covering the frost mound.
Vasil'chuk Y.K., Chizhova J.N., Budantseva N.A., Lychagin M.Y., Popovnin V.V., Tkachenko A.N. - Isotopic composition of winter snow on the Aibga Ridge (Krasnaya Polyana), Western Caucasus pp. 99-118


Abstract: The object of the study is the isotopic composition of the January snow on the slopes of the Aibga and Psekhako mountains in Krasnaya Polyana in 2010 (29 snow samples) and 2017 (58 snow samples). In 2010, the snow cover was sampled on the Aibga ridges and the Psekhako Ridge. In 2017, on the slope of the Aibga ridge, fresh snow was sampled. Along the ski run Rosa Khutor, surface snow was also sampled. Isotopic composition measurements were performed using the Delta-V (Finnigan) mass spectrometer in the isotope-geochemical laboratory of the Faculty of Geography of Lomonosov Moscow State University. The authors of the study conclude that high values of the deuterium excess can be caused by three reasons: 1) the air mass itself, which had been above the inland areas for a long time, has changed its isotope characteristics due to re-evaporation and moisture condensation, 2) the conditions of condensation, when adiabatic cooling of the air mass leads to isotope depletion in the precipitation, more prominent for δ18O than for δ2H and 3) post-sedimentation processes on the snow surface. Perhaps the isotopic composition of the snow cover in Krasnaya Polyana is formed under the influence of all these three factors.
Chizhova J.N. - The deuterium excess in three snowfalls in the Caucasus and the Polar Urals and the corresponding HYSPLIT back trajectories of air mass pp. 113-126


Abstract: The article discusses variations in the values of δ18O, δ2H, dexc of snow on Krasnaya Polyana, the southern slope of Elbrus and on the transect from Konosha to the Polar Urals. In each of the described snowfalls, the deuterium excess is a unique isotope mark of the prevailing process involved in the formation of the isotope composition of the snow cover. To interpret the values of obtained isotopes, we used the method of back trajectories by the HYSPLIY model. The main goal of the work is to demarcate the main processes responsible for the formation of the isotope composition of snow. On the Aibga slope in Caucasus, there is addition of a continental water vapor on the southern slope of Elbrus – wind erosion, and isotope fractionation during condensation in a single snowfall from Konosha to the Polar Urals. The back trajectories of air mass movement help considering in more detail the formation of the isotope composition of individual snowfalls.
Vasil'chuk A.C. - Palynological characteristics of the stages of succession of the arctic and subarctic tundras pp. 116-123


Abstract: The subject of the study is the subfossil pollen spectrum from polygonal tundra of different succession stages: the formation of a framework of vegetation and overgrowing patches of polygons. It is established that local components of the pollen spectrum are basic information on the stages of succession. Determination of the sequence of changes in the dominant pollen taxon in the process of typical succession enables the allocation of such sequences for pollen plots, allowing to more objectively assessing the changes in biocenoses. We also analyze the pollen spectrum features during the development of waterlogging and pyrogenic succession reflected in the palynologic signal. The main research method is the palynologic analysis of surface samples and interpret the results in relative stages of succession. The main conclusions of the study is allocation of the standard sequence of dominants on pollen plots, which correspond to the stages of succession. Pollen dominants sequences are detected migration of woody vegetation to the North by open ground, eutrophication of lakes, overgrowing of polygons in the Arctic tundra, as well as for pyrogenic succession
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