. Geomorphological, ground penetration radar profiling and paleolimnological investigations were ... more . Geomorphological, ground penetration radar profiling and paleolimnological investigations were carried out in the Lake SrednyayaTret (66.014009 N, 41.086294 E; 7.3 m ASL). Bottom sediments from the three boreholes were studied. Lithologostratigraphic description, grain-size and diatom analyses were carried out, loss on ignition, Corg/Nogr was determined. Radiocarbon ages were obtained from the lower horizons of post-glacial sediments. Signs of Late Glacial transgression (earlier ~12.1 kyr. cal. BP) and Early Holocene regression (started between ~12.1 and ~10.3 kyr. cal. BP) were determined. The next filling of the lake basin can be compared with the Middle Holocene transgression. At the same time sea waters did not penetrate into the lake basin. The beginning of this stage was apparently accompanied by intensification of coastal aeolian processes.
Abstract The Velikaya Salma Strait is part of a fiard, typical of the Kandalaksha Gulf of the Whi... more Abstract The Velikaya Salma Strait is part of a fiard, typical of the Kandalaksha Gulf of the White Sea. Seabed topography, landscapes, and bottom sediments were studied in an area of 35.12 km2 (depths of 10–120 m) using geophysical methods, geological sampling, and visual observations. Macrobenthos distribution was sampled at 15–60 m depth and studied using an underwater camera. Structural-denudation, glacial, gravity, and tidal current landforms were identified on the Strait seabed. Bottom sediments vary from boulder–pebble to pelite. The bathymetric zonation of their distribution is disturbed when tidal currents encounter the dissected seabed topography and by gravitational displacements. Macrobenthos distribution has statistically significant dependence on bottom sediments grain size and depths. Galathowenia oculata–Chaetozone setosa community prevails on muddy sediment, and Macoma calcarea–Scoloplos acutus community prevails on sandy bottom. Statistical relationships between sidescan sonar images and macrobenthos distribution are stable in the areas of gently dismembered seabed and are lost in the areas of dissected topography.
Data from geomorphological surveys of the Konyukhov Bay coast (north-western part of Onezhsky Pen... more Data from geomorphological surveys of the Konyukhov Bay coast (north-western part of Onezhsky Peninsula), radiocarbon dating of organogenic sediments, echo sounding of water areas of the bay and lakes (water lines at 15.8-26.1 m a. s. l.) performed during the voyage of the research vessel "Ecolog" in July 2014 were used to reconstruct the history of the landform development in the Holocene. The morphodynamics of the coast is considered as a result of interactions between coastal processes and the underlying litho- genic structure against the background of postglacial movements and climate change. Two geomorphological levels were distinguished and dated, which differ in the scope of transformation of ice-marginal formations of the Neva stage of the last glaciation by the sea and correspond to the main stages of post-glacial development of the relief: 1) paleo- straits and bays in depressions between moraine ridges at altitudes of 17.5-30 m a. s. l., filled in during the pos...
Currently, there is no single view of the Holocene global sea level kinematics. At the same time,... more Currently, there is no single view of the Holocene global sea level kinematics. At the same time, the question of a possibility of it exceeding the current sea level by several meters is being debated. The accumulative coasts of nearly tide-free seas, in areas where the vertical direction of coastal movement remained unchanged are the most convenient objects for studying this major paleogeographic issue. Effects of the sea level fluctuations are revealed in the resulting geomorphological structure and in the nature of sediment areas of the coastal zone developing in an accumulative mode. If the Holocene sea level exceeds its modern marks, then ladders of accumulative terraces would have formed over different parts of the coast. The heights of the terrace ladders would correspond to the amplitudes of these exceedances. The lower sediment levels should reflect the transgressive character of their formation in the structure of geological section, while the higher levels would reflect t...
Abstract The article presents a modern Geomorphological Map of the Kara Seafloor on a scale of 1 ... more Abstract The article presents a modern Geomorphological Map of the Kara Seafloor on a scale of 1 : 2 000 000 and its description. This map was compiled based on the Bathymetric Map of the Kara Sea of the same scale, created from large-scale (1 : 200 000 and 1 : 500 000) nautical charts. Based on these maps and data from silicate analysis of upper sediment layer samples, a Diagram of the Relative Sorption Capacity Bottom Sediments of the Western Part of the Kara Sea was compiled, which illustrates the position of regions most prone to sorption of pollutants. An integrated approach to studying the migration and accumulation of pollutants in marine ecosystems is proposed, combining the main factors affecting their accumulation in bottom sediments: geomorphological characteristics of the bottom, sorption parameters of sediments, and the role of geochemical barrier zones.
Introduction. Maintaining students’ psychological and physical health requires understanding all ... more Introduction. Maintaining students’ psychological and physical health requires understanding all the factors affecting children’s development. The purpose of this study is to assess the impact of stress factors, inadequate nutrition and low physical activity on schoolchildren’s health. Materials and Methods. The research uses general theoretical, empirical and statistical methods. The article reviews scholarly literature on the problem of stress in school-aged children, as well as sources containing relevant statistical data. I order to understand the degree of influence of stress and its accompanying factors on the health of schoolchildren aged 11-12 years, the authors conducted an empirical study at the regional prevention center called "Center for public health". The study was divided into two stages. At the first stage, medical research was carried out in accordance with the guidelines "Providing medical care to the children's population in health centers for ...
ABSTRACTThe generation of reliable age models for palaeoenvironmental and archaeological records ... more ABSTRACTThe generation of reliable age models for palaeoenvironmental and archaeological records in the Eurasian Arctic is often problematic when using conventional dating techniques. Tephrochronology can potentially improve the chronologies of such records and synchronise disparate sedimentary archives. However, to date, systematic tephra studies are lacking for this region. This paper presents the first cryptotephra data from the White Sea region (northwestern Russia) based on a peat core spanning the past ~1800 years. We identify seven geochemical glass populations that derive from six Icelandic volcanoes and correlate four of them to north European tephra isochrons; these include Askja ad 1875, the basaltic component of the ad 877 Landnám tephra, and tephras BTD‐15 (c. ad 1750–1650) and SL‐2/SB‐2 (ad 803–767) from unknown eruptions of Katla and Snæfellsjökull, respectively. The remaining three populations originate from Grímsvötn, Hekla and Katla; however, their attribution to i...
. Geomorphological, ground penetration radar profiling and paleolimnological investigations were ... more . Geomorphological, ground penetration radar profiling and paleolimnological investigations were carried out in the Lake SrednyayaTret (66.014009 N, 41.086294 E; 7.3 m ASL). Bottom sediments from the three boreholes were studied. Lithologostratigraphic description, grain-size and diatom analyses were carried out, loss on ignition, Corg/Nogr was determined. Radiocarbon ages were obtained from the lower horizons of post-glacial sediments. Signs of Late Glacial transgression (earlier ~12.1 kyr. cal. BP) and Early Holocene regression (started between ~12.1 and ~10.3 kyr. cal. BP) were determined. The next filling of the lake basin can be compared with the Middle Holocene transgression. At the same time sea waters did not penetrate into the lake basin. The beginning of this stage was apparently accompanied by intensification of coastal aeolian processes.
Abstract The Velikaya Salma Strait is part of a fiard, typical of the Kandalaksha Gulf of the Whi... more Abstract The Velikaya Salma Strait is part of a fiard, typical of the Kandalaksha Gulf of the White Sea. Seabed topography, landscapes, and bottom sediments were studied in an area of 35.12 km2 (depths of 10–120 m) using geophysical methods, geological sampling, and visual observations. Macrobenthos distribution was sampled at 15–60 m depth and studied using an underwater camera. Structural-denudation, glacial, gravity, and tidal current landforms were identified on the Strait seabed. Bottom sediments vary from boulder–pebble to pelite. The bathymetric zonation of their distribution is disturbed when tidal currents encounter the dissected seabed topography and by gravitational displacements. Macrobenthos distribution has statistically significant dependence on bottom sediments grain size and depths. Galathowenia oculata–Chaetozone setosa community prevails on muddy sediment, and Macoma calcarea–Scoloplos acutus community prevails on sandy bottom. Statistical relationships between sidescan sonar images and macrobenthos distribution are stable in the areas of gently dismembered seabed and are lost in the areas of dissected topography.
Data from geomorphological surveys of the Konyukhov Bay coast (north-western part of Onezhsky Pen... more Data from geomorphological surveys of the Konyukhov Bay coast (north-western part of Onezhsky Peninsula), radiocarbon dating of organogenic sediments, echo sounding of water areas of the bay and lakes (water lines at 15.8-26.1 m a. s. l.) performed during the voyage of the research vessel "Ecolog" in July 2014 were used to reconstruct the history of the landform development in the Holocene. The morphodynamics of the coast is considered as a result of interactions between coastal processes and the underlying litho- genic structure against the background of postglacial movements and climate change. Two geomorphological levels were distinguished and dated, which differ in the scope of transformation of ice-marginal formations of the Neva stage of the last glaciation by the sea and correspond to the main stages of post-glacial development of the relief: 1) paleo- straits and bays in depressions between moraine ridges at altitudes of 17.5-30 m a. s. l., filled in during the pos...
Currently, there is no single view of the Holocene global sea level kinematics. At the same time,... more Currently, there is no single view of the Holocene global sea level kinematics. At the same time, the question of a possibility of it exceeding the current sea level by several meters is being debated. The accumulative coasts of nearly tide-free seas, in areas where the vertical direction of coastal movement remained unchanged are the most convenient objects for studying this major paleogeographic issue. Effects of the sea level fluctuations are revealed in the resulting geomorphological structure and in the nature of sediment areas of the coastal zone developing in an accumulative mode. If the Holocene sea level exceeds its modern marks, then ladders of accumulative terraces would have formed over different parts of the coast. The heights of the terrace ladders would correspond to the amplitudes of these exceedances. The lower sediment levels should reflect the transgressive character of their formation in the structure of geological section, while the higher levels would reflect t...
Abstract The article presents a modern Geomorphological Map of the Kara Seafloor on a scale of 1 ... more Abstract The article presents a modern Geomorphological Map of the Kara Seafloor on a scale of 1 : 2 000 000 and its description. This map was compiled based on the Bathymetric Map of the Kara Sea of the same scale, created from large-scale (1 : 200 000 and 1 : 500 000) nautical charts. Based on these maps and data from silicate analysis of upper sediment layer samples, a Diagram of the Relative Sorption Capacity Bottom Sediments of the Western Part of the Kara Sea was compiled, which illustrates the position of regions most prone to sorption of pollutants. An integrated approach to studying the migration and accumulation of pollutants in marine ecosystems is proposed, combining the main factors affecting their accumulation in bottom sediments: geomorphological characteristics of the bottom, sorption parameters of sediments, and the role of geochemical barrier zones.
Introduction. Maintaining students’ psychological and physical health requires understanding all ... more Introduction. Maintaining students’ psychological and physical health requires understanding all the factors affecting children’s development. The purpose of this study is to assess the impact of stress factors, inadequate nutrition and low physical activity on schoolchildren’s health. Materials and Methods. The research uses general theoretical, empirical and statistical methods. The article reviews scholarly literature on the problem of stress in school-aged children, as well as sources containing relevant statistical data. I order to understand the degree of influence of stress and its accompanying factors on the health of schoolchildren aged 11-12 years, the authors conducted an empirical study at the regional prevention center called "Center for public health". The study was divided into two stages. At the first stage, medical research was carried out in accordance with the guidelines "Providing medical care to the children's population in health centers for ...
ABSTRACTThe generation of reliable age models for palaeoenvironmental and archaeological records ... more ABSTRACTThe generation of reliable age models for palaeoenvironmental and archaeological records in the Eurasian Arctic is often problematic when using conventional dating techniques. Tephrochronology can potentially improve the chronologies of such records and synchronise disparate sedimentary archives. However, to date, systematic tephra studies are lacking for this region. This paper presents the first cryptotephra data from the White Sea region (northwestern Russia) based on a peat core spanning the past ~1800 years. We identify seven geochemical glass populations that derive from six Icelandic volcanoes and correlate four of them to north European tephra isochrons; these include Askja ad 1875, the basaltic component of the ad 877 Landnám tephra, and tephras BTD‐15 (c. ad 1750–1650) and SL‐2/SB‐2 (ad 803–767) from unknown eruptions of Katla and Snæfellsjökull, respectively. The remaining three populations originate from Grímsvötn, Hekla and Katla; however, their attribution to i...
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