DIATOMS IN BOTTOM SEDIMENTS OF THE ARCTIC LAKE IN THE PECHORA RIVER DELTA (NENETS AUTONOMOUS OKRUG, RUSSIA)

2020 ◽  
Author(s):  
Elvira Valieva ◽  
Larisa Frolova ◽  
Gulnara Nigamatzyanova ◽  
Niyaz Nigmatullin ◽  
Bulat Gareev
Keyword(s):  
Bottom Sediments ◽  
River Delta ◽  
The Arctic ◽  
Arctic Lake ◽  
Pechora River ◽  
Nenets Autonomous

INTEGRATED METHODOLOGY FOR TAKING INTO ACCOUNT THE VIEWS AND OPINONSOF INDIGENOUS PEOPLES IN THEIR INTERACTION WITH PUBLIC AUTHORITIES (ON THE EXAMPLE OF THE YAMAL-NENETS AUTONOMOUS DISTRICT)

2020 ◽  
Vol 6 (2) ◽  
pp. 124-147
Author(s):  
Elena F. GLADUN ◽  
Gennady F. DETTER ◽  
Olga V. ZAKHAROVA ◽  
Sergei M. ZUEV ◽  
Lyubov G. VOZELOVA
Keyword(s):  
Indigenous Peoples ◽  
Citizen Participation ◽  
Indigenous Communities ◽  
The Arctic ◽  
Legal Issue ◽  
Public Authorities ◽  
Autonomous District ◽  
Integrated Methodology ◽  
The World ◽  
Nenets Autonomous

Developing democracy institutions and citizen participation in state affairs, the world community focuses on postcolonial studies, which allow us to identify new perspectives, set new priorities in various areas, in law and public administration among others. In Arctic countries, postcolonial discourse has an impact on the methodology of research related to indigenous issues, and this makes possible to understand specific picture of the world and ideas about what is happening in the world. Moreover, the traditions of Russian state and governance are specific and interaction between indigenous peoples and public authorities should be studied with a special research methodology which would reflect the peculiarities of domestic public law and aimed at solving legal issue and enrich public policy. The objective of the paper is to present a new integrated methodology that includes a system of philosophical, anthropological, socio-psychological methods, as well as methods of comparative analysis and scenario development methods to involve peripheral communities into decision-making process of planning the socio-economic development in one of Russia’s Arctic regions — the Yamal-Nenets Autonomous District and to justify and further legislatively consolidate the optimal forms of interaction between public authorities and indigenous communities of the North. In 2020, the Arctic Research Center conducted a sociological survey in the Shuryshkararea of the Yamal-Nenets Autonomous District, which seems to limit existing approaches to identifying public opinion about prospects for developing villages and organizing life of their residents. Our proposed methodology for taking into account the views of indigenous peoples can help to overcome the identified limitations.

scholarly journals Sentinel-1 SAR Interferometry for Surface Deformation Monitoring in Low-Land Permafrost Areas

2018 ◽  
Vol 10 (9) ◽  
pp. 1360 ◽  
Author(s):  
Tazio Strozzi ◽  
Sofia Antonova ◽  
Frank Günther ◽  
Eva Mätzler ◽  
Gonçalo Vieira ◽  
...  
Keyword(s):  
Time Series ◽  
Surface Displacement ◽  
Deformation Monitoring ◽  
In Situ Measurements ◽  
River Delta ◽  
Sar Interferometry ◽  
The Arctic ◽  
Lena River ◽  
Lena River Delta

Low-land permafrost areas are subject to intense freeze-thaw cycles and characterized by remarkable surface displacement. We used Sentinel-1 SAR interferometry (InSAR) in order to analyse the summer surface displacement over four spots in the Arctic and Antarctica since 2015. Choosing floodplain or outcrop areas as the reference for the InSAR relative deformation measurements, we found maximum subsidence of about 3 to 10 cm during the thawing season with generally high spatial variability. Sentinel-1 time-series of interferograms with 6–12 day time intervals highlight that subsidence is often occurring rather quickly within roughly one month in early summer. Intercomparison of summer subsidence from Sentinel-1 in 2017 with TerraSAR-X in 2013 over part of the Lena River Delta (Russia) shows a high spatial agreement between both SAR systems. A comparison with in-situ measurements for the summer of 2014 over the Lena River Delta indicates a pronounced downward movement of several centimetres in both cases but does not reveal a spatial correspondence between InSAR and local in-situ measurements. For the reconstruction of longer time-series of deformation, yearly Sentinel-1 interferograms from the end of the summer were considered. However, in order to infer an effective subsidence of the surface through melting of excess ice layers over multi-annual scales with Sentinel-1, a longer observation time period is necessary.

scholarly journals Lena River Delta formation during the Holocene

2014 ◽  
Vol 11 (3) ◽  
pp. 4085-4122 ◽  
Author(s):  
D. Bolshiyanov ◽  
A. Makarov ◽  
L. Savelieva
Keyword(s):  
Sea Water ◽  
River Delta ◽  
The Arctic ◽  
Laptev Sea ◽  
Lena River ◽  
Sea Levels ◽  
Marine Terraces ◽  
Delta Formation ◽  
Carbon Reservoir ◽  
Lena River Delta

Abstract. The Lena River Delta, the largest delta of the Arctic Ocean, differs from other deltas because it consists mainly of organomineral sediments, commonly called peat, that contain a huge organic carbon reservoir. The analysis of Delta sediment radiocarbon ages showed that they could not have formed as peat during floodplain bogging, but accumulated when Laptev Sea water level was high and green mosses and sedges grew and were deposited on the surface of flooded marshes. The Lena River Delta formed as organomineral masses and layered sediments accumulated during transgressive phases when sea level rose. In regressive phases, the islands composed of these sediments and other, more ancient islands were eroded. Each new sea transgression led to further accumulation of layered sediments. As a result of alternating transgressive and regressive phases the first alluvial-marine terrace formed, consisting of geological bodies of different ages. Determining the formation age of different areas of the first terrace and other marine terraces on the coast allowed the periods of increasing (8–6 Ka, 4.5–4 Ka, 2.5–1.5 Ka, 0.4–0.2 Ka) and decreasing (5 Ka, 3 Ka, 0.5 Ka) Laptev Sea levels to be distinguished in the Lena Delta area.

scholarly journals Dynamics of the relief and sesmotectonic activity of the modern structures in the delta of the river lena

2019 ◽  
pp. 62-77
Author(s):  
L. P. Imaeva ◽  
G. S. Gusev ◽  
V. S. Imaev
Keyword(s):  
Transition Zone ◽  
North American ◽  
Active Faults ◽  
River Delta ◽  
The Arctic ◽  
Main Element ◽  
Dominant Factor ◽  
Lena River ◽  
Lithospheric Plates ◽  
Lena River Delta

This paper presents seismogeodynamic analysis of modern structures located in the Lena river delta. These structures are key elements in the tectonic evolution of the shelf–continent transition zone in the Arctic segment of the boundary between the Eurasian and North American lithospheric plates. The geological structure of the Lena river delta is predetermined by the junction of the ancient Siberian platform and the Mesozoic Laptev Sea plate. These two large geoblocks of the crust, which differ in age, are separated by a fragment of the Kharaulakh segment of the Verkhoyansk fold system. In our study aimed to reveal regularities in seismotectonic destruction of the crust, we analyzed the geological and geophysical data on the crustal structure, active faults, modern structural plan, dynamic characteristics of the modern relief, and hydrological features characterizing of the flow redistribution in the Lena riverbed. A system of active faults identified in the Lena river delta shows a contrasting kinematic plan of the junction zone of the main geostructures. According to the analysis results, shear faulting is a dominant factor of impact on the morphologic features and seismogeodynamic activation of the modern structures. A regional right-lateral strike-slip fault of the sublatitudinal strike is traced as a major structural boundary that cuts the Lena river delta into several geodynamic segments. Seismotectonic destruction of the crust in the segments differs in types (transpression, transtension and compression). The above-mentioned fault is not only the main element of the kinematic plan of the newest structures in the Lena river delta – it controls the general structural pattern and seismotectonic parameters of active fault zones in the entire northern sector of the Verkhoyansk marginal suture. The seismogeodynamic analysis results obtained in our study provide a reliable basis for estimating potential seismic hazard of the modern structures in the Lena river delta and updating the available seismic zoning maps of the shelf–continent transition zone in the Arctic segment of the boundary between the Eurasian and North American lithospheric plates.

scholarly journals Stabilization of organic material from soils and soil-like bodies in the Lena River Delta (13C-NMR spectroscopy analysis)

2020 ◽  
Vol 10 ◽  
Author(s):  
Vyacheslav Polyakov ◽  
Evgeny Abakumov
Keyword(s):  
Nmr Spectroscopy ◽  
Humic Acids ◽  
Soil Layer ◽  
13C Nmr Spectroscopy ◽  
River Delta ◽  
The Arctic ◽  
Polar Regions ◽  
Alluvial Deposits ◽  
Lena River ◽  
Lena River Delta

The Arctic ecosystem has a huge reservoir of soil organic carbon stored in permafrost-affected soils and biosediments. During the short vegetation season, humification and mineralization processes in the active soil layer result in the formation of specific soil organic substances – humic substances. Humic acids are high molecular, specific, thermodynamically stable macromolecules. The study was conducted in the Lena River Delta, the largest river delta located in the Arctic. Cryosol-type soils on alluvial deposits of the river form an area of about 45 thousand km<sup>2</sup> under permafrost conditions. The vegetation cover is represented by moss-lichen communities with the presence of <em>Salix glauca</em> in the flooded areas, as well as <em>Betula nana</em> in the areas not subject to flooding. The paper presents the elemental and molecular composition of humic acids isolated from soils, integral indicators of humification (stabilization) of organic matter in the soils of the Lena River Delta. The study was conducted using the <sup>13</sup>C (CP/MAS) NMR spectroscopy method. In the work, it was revealed that up to 33% of aromatic and up to 15% COOR fragments are accumulated in humic acids. The AR/AL ratio ranged from 0.69 to 0.89. The studied soils are variants of modern soil formation (not subjected to alluvial processes) and soil-like bodies that melted from the IC of the river delta. A relatively high degree of condensation of humic acid macromolecules in comparison with other polar regions of the Arctic and Antarctic was noted.

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