Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.108
G. Zdorovennova, Sergei Golosov, N. Palshin, I. Zverev, T. Efremova, A. Terzhevik, R. Zdorovennov, S. Bogdanov, I. Fedorova
This article investigates regularities of thermal and ice regimes of three small lakes of Karelia under current climatic conditions. Data of measurements of water temperature at autonomous stations and results of numerical calculations of the dates of ice-on and ice-off and the thickness of ice in these lakes using the one-dimensional parameterized model FLake in the anomalously warm winter season of 2019-2020 are analyzed. Data obtained are compared with long-term values over 1994-2019. The dates of the ice-on and ice-off on the lakes were quite close; however, on two larger lakes, intermediate ice destruction was observed at the beginning of winter, due to which the duration of the ice season differed between lakes by two weeks. The winter months of 2019-2020 were 6.4-9.4 ° C warmer than the baseline, which was reflected in a noticeably smaller ice thickness on the lakes compared to previous years of measurements (40-48 cm at the end of March 2020 compared to the values in mid-April in 1994-2004 - 65-85 cm and in 2005-2018 - 50-65 cm). The decrease in ice thickness contributed to an early onset (mid-March) and long duration (more than five weeks) of spring subglacial convection. The model calculation, taking into account the atmospheric impact based on the ERA-5 re-analysis, reproduced the main features of the ice regime of the lakes, including the intermediate destruction of ice at the beginning of winter on two larger lakes. Significant regression relationships have been obtained between the dates of ice-on and ice-off on Lake Vendyurskoe, the dates of the onset and duration of spring under-ice convection, and the characteristics of the regional climate of southern Karelia (air temperature and the number of days with thaw in winter and spring months) for 1994-2020. The relationship between the dates of ice-on and the water temperature in the lake in winter is shown.
{"title":"Winter thermal and ice regimes of small Karelian lakes against the background of regional climatic variability","authors":"G. Zdorovennova, Sergei Golosov, N. Palshin, I. Zverev, T. Efremova, A. Terzhevik, R. Zdorovennov, S. Bogdanov, I. Fedorova","doi":"10.21638/spbu07.2022.108","DOIUrl":"https://doi.org/10.21638/spbu07.2022.108","url":null,"abstract":"This article investigates regularities of thermal and ice regimes of three small lakes of Karelia under current climatic conditions. Data of measurements of water temperature at autonomous stations and results of numerical calculations of the dates of ice-on and ice-off and the thickness of ice in these lakes using the one-dimensional parameterized model FLake in the anomalously warm winter season of 2019-2020 are analyzed. Data obtained are compared with long-term values over 1994-2019. The dates of the ice-on and ice-off on the lakes were quite close; however, on two larger lakes, intermediate ice destruction was observed at the beginning of winter, due to which the duration of the ice season differed between lakes by two weeks. The winter months of 2019-2020 were 6.4-9.4 ° C warmer than the baseline, which was reflected in a noticeably smaller ice thickness on the lakes compared to previous years of measurements (40-48 cm at the end of March 2020 compared to the values in mid-April in 1994-2004 - 65-85 cm and in 2005-2018 - 50-65 cm). The decrease in ice thickness contributed to an early onset (mid-March) and long duration (more than five weeks) of spring subglacial convection. The model calculation, taking into account the atmospheric impact based on the ERA-5 re-analysis, reproduced the main features of the ice regime of the lakes, including the intermediate destruction of ice at the beginning of winter on two larger lakes. Significant regression relationships have been obtained between the dates of ice-on and ice-off on Lake Vendyurskoe, the dates of the onset and duration of spring under-ice convection, and the characteristics of the regional climate of southern Karelia (air temperature and the number of days with thaw in winter and spring months) for 1994-2020. The relationship between the dates of ice-on and the water temperature in the lake in winter is shown.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74374875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.205
O. Marchukova, E. Voskresenskaya
In this paper the dataset of global ocean chlorophyll «a» (Chl a) concentration from the GlobColour project over the equatorial Pacific during the La Niña events from 1998 to 2018 is analyzed. GlobColour includes satellite sensors such as SeaWiFS, MODIS, MERIS and others. The study of changes in chlorophyll «a» concentration is carried out with an analysis of sea temperature and current distributions on the surface and over the ocean depth taken from the NCEP GODAS reanalysis from 1981 to 2018. Additionally the trade wind indices from 1979 to 2018 are used. The purpose of the work is to study the mechanisms of formation of two La Niña types, leading to the occurrence of different climatic anomalies in different regions of our planet. It is found that at the initial stage of the Central Pacific La Niña type origin the ocean chlorophyll «a» concentration over the center equatorial Pacific increases in six to eight times (from 0.1 mg/m3 to 0.8 mg/m3) and the thermocline depth in this area decreases to 50 m indicating the intensification of the central equatorial upwelling. During the East Pacific La Nina type the central equatorial upwelling is not formed and negative sea surface temperature anomalies are formed by increasing of the Peruvian upwelling supported intensification trade winds on the East Pacific equatorial sector. All obtained results are confirmed by a 95% statistically significant by Student's test. Thus, the work is demonstrated significant differences in the features of the two La Niña types formation at their initial stage of origin.
{"title":"Features of the formation of the Central and East Pacific La Niña types","authors":"O. Marchukova, E. Voskresenskaya","doi":"10.21638/spbu07.2022.205","DOIUrl":"https://doi.org/10.21638/spbu07.2022.205","url":null,"abstract":"In this paper the dataset of global ocean chlorophyll «a» (Chl a) concentration from the GlobColour project over the equatorial Pacific during the La Niña events from 1998 to 2018 is analyzed. GlobColour includes satellite sensors such as SeaWiFS, MODIS, MERIS and others. The study of changes in chlorophyll «a» concentration is carried out with an analysis of sea temperature and current distributions on the surface and over the ocean depth taken from the NCEP GODAS reanalysis from 1981 to 2018. Additionally the trade wind indices from 1979 to 2018 are used. The purpose of the work is to study the mechanisms of formation of two La Niña types, leading to the occurrence of different climatic anomalies in different regions of our planet. It is found that at the initial stage of the Central Pacific La Niña type origin the ocean chlorophyll «a» concentration over the center equatorial Pacific increases in six to eight times (from 0.1 mg/m3 to 0.8 mg/m3) and the thermocline depth in this area decreases to 50 m indicating the intensification of the central equatorial upwelling. During the East Pacific La Nina type the central equatorial upwelling is not formed and negative sea surface temperature anomalies are formed by increasing of the Peruvian upwelling supported intensification trade winds on the East Pacific equatorial sector. All obtained results are confirmed by a 95% statistically significant by Student's test. Thus, the work is demonstrated significant differences in the features of the two La Niña types formation at their initial stage of origin.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79374829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.106
A. Danshin, Andrey V. Radikevich
This work explores spatial differentiation of agriculture and the identification of the existing differentiation in a territory where there are contrasts in economic development as a whole and of the agricultural sector in a particular industry. The method of economic-geographic profiling for the Inter-capital region (along the line of the Minsk-Moscow profile) was used, and dynamics for the last 10 years were investigated. Approaches are proposed for the use of profiling to identify possible growth centers that can become drivers of agricultural development, as well as depressed areas that need to be developed primarily with the help of various instruments of interethnic and regional policy. The most important role in the development of depressed areas can be played by agriculture, which is characterized by short production cycles and the ability to quickly introduce innovations that inevitably arise in cross-border cooperation due to the flow of knowledge and technology, and exchange of experience and cooperation. Because of the profile, two emerging territorial agrarian clusters in Belarus were identified. Also, quantitatively and qualitatively, the gap at the level of agricultural development between the two states was highlighted, which turned out to be more significant than expected (for some product categories by more than an order of magnitude). Profiling for different time periods includes main trends in agricultural development of the Intercapital Region: gravitation of agriculture towards the centers of districts (agropolisation), polarization and the outrunning development of the Russian sector in recent years of the import substitution policy. With this influence of the capitals of the two countries and capacious consumer markets, the formation of high-intensity suburban agriculture is not shown at this stage. The absence of the influence of the inter-capital situation for the peripheral territories of Belarus and Russia is shown.
{"title":"The method of economic-geographic profiling of agriculture for territories with contrasting indicators of development","authors":"A. Danshin, Andrey V. Radikevich","doi":"10.21638/spbu07.2022.106","DOIUrl":"https://doi.org/10.21638/spbu07.2022.106","url":null,"abstract":"This work explores spatial differentiation of agriculture and the identification of the existing differentiation in a territory where there are contrasts in economic development as a whole and of the agricultural sector in a particular industry. The method of economic-geographic profiling for the Inter-capital region (along the line of the Minsk-Moscow profile) was used, and dynamics for the last 10 years were investigated. Approaches are proposed for the use of profiling to identify possible growth centers that can become drivers of agricultural development, as well as depressed areas that need to be developed primarily with the help of various instruments of interethnic and regional policy. The most important role in the development of depressed areas can be played by agriculture, which is characterized by short production cycles and the ability to quickly introduce innovations that inevitably arise in cross-border cooperation due to the flow of knowledge and technology, and exchange of experience and cooperation. Because of the profile, two emerging territorial agrarian clusters in Belarus were identified. Also, quantitatively and qualitatively, the gap at the level of agricultural development between the two states was highlighted, which turned out to be more significant than expected (for some product categories by more than an order of magnitude). Profiling for different time periods includes main trends in agricultural development of the Intercapital Region: gravitation of agriculture towards the centers of districts (agropolisation), polarization and the outrunning development of the Russian sector in recent years of the import substitution policy. With this influence of the capitals of the two countries and capacious consumer markets, the formation of high-intensity suburban agriculture is not shown at this stage. The absence of the influence of the inter-capital situation for the peripheral territories of Belarus and Russia is shown.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80716265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.110
V. Kryukov, E. Golubeva
To take into account both ecosystem and socio-economic functions, it is necessary to carry out functional zoning of specially protected natural areas (SPNA). The dynamics of zoning of the Losiny Ostrov National Park from 1988 to 2012 was assessed from the position of environmental regimes using open-access data. Using GIS technologies, the estimated dynamic schemes of environmental restrictions were obtained. The tendency to easing regulations clearly exists: the weighted average dynamic parameter of environmental value is -3.27 (possible values vary from -20 to 20). The 2012 version established stronger transformations of environmental restrictions than in 2010 (dynamic indicators are -0.62 and -2.65, respectively). The greatest negative changes for natural complexes are associated with the allocation of a historical and cultural zone, the transformation of third-party user sites into economic zones, the expansion of the recreational zone, and the disappearance of the educational and excursion zone. Differences between Moscow city and the adjacent Moscow region are negligible. However, there is considerable disparity between current zoning of urban and regional parts of the park (restriction indicators are 7.41 and 12.17, respectively). Urban space is more oriented towards recreation, indicating an incompatibility with the status of a national park. In contrast to the outer 1000-meter belt, the central part of the park has had greater deterioration of nature restrictions. The weighted average indicator of ecosystem compliance (environmental restrictions and vulnerability of natural complexes) is 3.3 (possible values range from -20 to 20), which points to a sufficient level of compliance with the functional zoning of landscape vulnerability. This accordance is more typical of inner part of the park inner and territories within the boundary of Moscow.
{"title":"Elk Island (Losinyi Ostrov) national park: transformation of regulations in urban environment","authors":"V. Kryukov, E. Golubeva","doi":"10.21638/spbu07.2022.110","DOIUrl":"https://doi.org/10.21638/spbu07.2022.110","url":null,"abstract":"To take into account both ecosystem and socio-economic functions, it is necessary to carry out functional zoning of specially protected natural areas (SPNA). The dynamics of zoning of the Losiny Ostrov National Park from 1988 to 2012 was assessed from the position of environmental regimes using open-access data. Using GIS technologies, the estimated dynamic schemes of environmental restrictions were obtained. The tendency to easing regulations clearly exists: the weighted average dynamic parameter of environmental value is -3.27 (possible values vary from -20 to 20). The 2012 version established stronger transformations of environmental restrictions than in 2010 (dynamic indicators are -0.62 and -2.65, respectively). The greatest negative changes for natural complexes are associated with the allocation of a historical and cultural zone, the transformation of third-party user sites into economic zones, the expansion of the recreational zone, and the disappearance of the educational and excursion zone. Differences between Moscow city and the adjacent Moscow region are negligible. However, there is considerable disparity between current zoning of urban and regional parts of the park (restriction indicators are 7.41 and 12.17, respectively). Urban space is more oriented towards recreation, indicating an incompatibility with the status of a national park. In contrast to the outer 1000-meter belt, the central part of the park has had greater deterioration of nature restrictions. The weighted average indicator of ecosystem compliance (environmental restrictions and vulnerability of natural complexes) is 3.3 (possible values range from -20 to 20), which points to a sufficient level of compliance with the functional zoning of landscape vulnerability. This accordance is more typical of inner part of the park inner and territories within the boundary of Moscow.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87968703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.103
E. Logvina, A. Krylov, T. Matveeva, F. Maksimov, V. Kuznetsov
The paper presents the results of studies of authigenic carbonates sampled in the near-surface sediments of the gas-hydrate-bearing CHAOS structure located on the western slope of the Deryugin Basin in the Sea of Okhotsk. Carbonates were at different stages of formation, the most common morphological forms of which were concretions. Microscopic studies have shown that the concretions are formed by pelitomorphic carbonate cementing the terrigenous clay-clastic matrix and organic detritus. According to X-ray phase analysis, the dominant mineral composing nodules is cryptocrystalline high-Mg calcite (14.2-16.9 mol% Mg). Based on the geochemical modeling the intervals of the sediments with favorable conditions for the formation of basic carbonate minerals (aragonite, calcite, and dolomite) were identified. Almost over the entire area of the structure, the formation of carbonates occurs at more than 1m and up to 5m sub-bottom depths. In the central part of the structure (station LV31-27GC) the formation of carbonates is also possible in the upper part of the sedimentary section - from 0 to 1,5 m. On the basis of balance calculations of the δ13C isotopes content in nodules, the contribution of the main carbon sources involved in their formation was estimated. These sources turned out to be organic matter and microbial methane in a ratio of 67.5: 32.5. It was found that the conversion of carbon dioxide into bicarbonate ion occurs under conditions of early diagenesis due to the interaction of the fluid with aluminosilicates. Calculations of the isotopic composition of pore waters (the main source of oxygen in carbonates) and paleotemperatures indicate crystallization of carbonates at low (close to 0 ° C) temperatures. Based on 230Th/U-dating of carbonates, the age of the studied unloading source was determined as ~ 3.5 thousand years. It was found that the CHAOS structure is one of the “youngest” on the northeastern slope of the Sakhalin Island.
{"title":"Authigenesis of carbonates in the deposits of the gas-hydrate-bearing structure of the CHAOS (Sea of Okhotsk)","authors":"E. Logvina, A. Krylov, T. Matveeva, F. Maksimov, V. Kuznetsov","doi":"10.21638/spbu07.2022.103","DOIUrl":"https://doi.org/10.21638/spbu07.2022.103","url":null,"abstract":"The paper presents the results of studies of authigenic carbonates sampled in the near-surface sediments of the gas-hydrate-bearing CHAOS structure located on the western slope of the Deryugin Basin in the Sea of Okhotsk. Carbonates were at different stages of formation, the most common morphological forms of which were concretions. Microscopic studies have shown that the concretions are formed by pelitomorphic carbonate cementing the terrigenous clay-clastic matrix and organic detritus. According to X-ray phase analysis, the dominant mineral composing nodules is cryptocrystalline high-Mg calcite (14.2-16.9 mol% Mg). Based on the geochemical modeling the intervals of the sediments with favorable conditions for the formation of basic carbonate minerals (aragonite, calcite, and dolomite) were identified. Almost over the entire area of the structure, the formation of carbonates occurs at more than 1m and up to 5m sub-bottom depths. In the central part of the structure (station LV31-27GC) the formation of carbonates is also possible in the upper part of the sedimentary section - from 0 to 1,5 m. On the basis of balance calculations of the δ13C isotopes content in nodules, the contribution of the main carbon sources involved in their formation was estimated. These sources turned out to be organic matter and microbial methane in a ratio of 67.5: 32.5. It was found that the conversion of carbon dioxide into bicarbonate ion occurs under conditions of early diagenesis due to the interaction of the fluid with aluminosilicates. Calculations of the isotopic composition of pore waters (the main source of oxygen in carbonates) and paleotemperatures indicate crystallization of carbonates at low (close to 0 ° C) temperatures. Based on 230Th/U-dating of carbonates, the age of the studied unloading source was determined as ~ 3.5 thousand years. It was found that the CHAOS structure is one of the “youngest” on the northeastern slope of the Sakhalin Island.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78324767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.204
Dmitriy Sadokov, T. Sapelko, N. Bobrov, M. Melles, G. Fedorov
Few detailed case studies have been devoted so far to the Late Pleistocene palaeogeography of the northern Mologa-Sheksna Lowland (MSL), compared to adjacent regions covering the Valdai glaciation marginal zone. Lake Beloye (Russia, Vologda region, Babaevo district) bottom sediments were studied using ground penetrating radar (GPR) and subsequently were cored in order to build a palaeoclimatic reconstruction for the northern MSL, because lacustrine deposits are considered to be valuable and representative palaeoarchive of the area. Chronology of regional palaeoclimatic and palaeohydrological changes from the Bølling — Allerød warming to the Early Holocene was traced on the basis of inorganic and organic geochemistry, mineralogical proxies, grain-size, magnetic susceptibility, accelerator mass spectrometry radiocarbon dating and optical microanalysis. During the Late Glacial and the Pleistocene/Holocene transition in the northern MSL interstadial climatic conditions were determined at ~ 14.0 cal. ka BP (Bølling, stage GI-1e of the GICC05 timescale) and ~ 13.0 cal. ka BP (Allerød, stages GI-1c3 — GI-1a). A pronounced cold period associated with Younger Dryas (stage GS- 1) was registered in the multiproxy record at 12.8–11.7 cal. ka BP. High-resolution x-ray fluorescence (XRF) core scanning helped to reveal short-term “cold” events at ~ 13.7, ~ 13.1 and ~11.5 cal. ka BP, which were associated with Older Dryas (stage GI-1d), Gerzensee-Killarney oscillation (stage GI-1b) and Preboreal oscillation respectively, and “warm” episodes at ~ 13.2 and ~ 11.8 cal. ka BP, which presumably correspond to the end of the stage GI-1c1 and Greenlandian Stage/Age respectively. Ultimate interglacial (Holocene) climate onset within the MSL was attributed to ~ 11,7 cal. ka BP, which is marked by the sharp rise of total organic carbon content in the sediments and lithological changes to muddy fraction. Numerous water level oscillations occurred in the large proglacial lakeduring the last glacial termination, ending with Its final drainage in the northern MSL by ~ 10.9 cal. ka BP. The reconstructed palaeoclimatic dynamics is in overall agreements with the global reconstructions for the North Atlantic and Fennoscandia regions.
迄今为止，与覆盖瓦尔代冰川边缘地带的邻近地区相比，很少有详细的案例研究专门用于莫洛加-谢克斯纳低地北部(MSL)的晚更新世古地理。利用探地雷达(GPR)对Beloye湖(俄罗斯，Vologda地区，Babaevo地区)底部沉积物进行了研究，并进行了取芯，以建立MSL北部的古气候重建，因为湖泊沉积物被认为是该地区有价值和代表性的古档案。利用无机和有机地球化学、矿物学指标、粒度、磁化率、加速器质谱放射性碳定年和光学显微分析等方法，追溯了从Bølling—allerlod变暖至全新世早期区域古气候和古水文变化的年代学。在晚冰期和更新世/全新世过渡时期，MSL北部的间冰期气候条件分别为~ 14.0 cal. ka BP (GICC05时标GI-1e期Bølling)和~ 13.0 cal. ka BP (alle ød期GI-1c3 - GI-1a)。在12.8-11.7 cal. ka BP的多代理记录中记录了与新仙女木期(GS- 1期)相关的明显冷期。高分辨率x射线荧光(XRF)岩心扫描有助于揭示~ 13.7、~ 13.1和~11.5 cal. ka BP的短期“冷”事件，分别与古仙女木期(GI-1d期)、Gerzensee-Killarney振荡期(GI-1b期)和Preboreal振荡期有关，以及~ 13.2和~ 11.8 cal. ka BP的“暖”事件，可能分别对应GI-1c1期和格陵兰期/年龄的末期。MSL内的间冰期(全新世)气候最终开始于~ 11.7 cal. ka BP，其特征是沉积物中总有机碳含量急剧上升，岩性转变为泥质组分。末次冰期终止期间，大型前冰期湖泊发生了多次水位振荡，并在约10.9 cal. ka BP的时间内以其在MSL北部的最终排水结束。重建的古气候动力学与北大西洋和芬诺斯坎迪亚地区的全球重建结果基本一致。
{"title":"Late Glacial and Early Holocene lacustrine sedimentation history of the northern Mologa-Sheksna Lowland derived from Lake Beloye sediments (NW Russia)","authors":"Dmitriy Sadokov, T. Sapelko, N. Bobrov, M. Melles, G. Fedorov","doi":"10.21638/spbu07.2022.204","DOIUrl":"https://doi.org/10.21638/spbu07.2022.204","url":null,"abstract":"Few detailed case studies have been devoted so far to the Late Pleistocene palaeogeography of the northern Mologa-Sheksna Lowland (MSL), compared to adjacent regions covering the Valdai glaciation marginal zone. Lake Beloye (Russia, Vologda region, Babaevo district) bottom sediments were studied using ground penetrating radar (GPR) and subsequently were cored in order to build a palaeoclimatic reconstruction for the northern MSL, because lacustrine deposits are considered to be valuable and representative palaeoarchive of the area. Chronology of regional palaeoclimatic and palaeohydrological changes from the Bølling — Allerød warming to the Early Holocene was traced on the basis of inorganic and organic geochemistry, mineralogical proxies, grain-size, magnetic susceptibility, accelerator mass spectrometry radiocarbon dating and optical microanalysis. During the Late Glacial and the Pleistocene/Holocene transition in the northern MSL interstadial climatic conditions were determined at ~ 14.0 cal. ka BP (Bølling, stage GI-1e of the GICC05 timescale) and ~ 13.0 cal. ka BP (Allerød, stages GI-1c3 — GI-1a). A pronounced cold period associated with Younger Dryas (stage GS- 1) was registered in the multiproxy record at 12.8–11.7 cal. ka BP. High-resolution x-ray fluorescence (XRF) core scanning helped to reveal short-term “cold” events at ~ 13.7, ~ 13.1 and ~11.5 cal. ka BP, which were associated with Older Dryas (stage GI-1d), Gerzensee-Killarney oscillation (stage GI-1b) and Preboreal oscillation respectively, and “warm” episodes at ~ 13.2 and ~ 11.8 cal. ka BP, which presumably correspond to the end of the stage GI-1c1 and Greenlandian Stage/Age respectively. Ultimate interglacial (Holocene) climate onset within the MSL was attributed to ~ 11,7 cal. ka BP, which is marked by the sharp rise of total organic carbon content in the sediments and lithological changes to muddy fraction. Numerous water level oscillations occurred in the large proglacial lakeduring the last glacial termination, ending with Its final drainage in the northern MSL by ~ 10.9 cal. ka BP. The reconstructed palaeoclimatic dynamics is in overall agreements with the global reconstructions for the North Atlantic and Fennoscandia regions.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81587416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.303
D. Zemlianskii, V. Chuzhenkova
The development of the Far Eastern Federal District is a priority of the federal investment and regional policy. To create new jobs and attract private investment to the territory of the district, preferential regimes are being created in the macroregion – Special economic Zones (SEZ), Territories of advanced socio-economic development (TASED), the Free Port of Vladivostok (FPV), etc. The article analyzes the differences in the dynamics of socio-economic development of municipalities (hereinafter referred to as MO), on the territory of which preferential regimes operate with other MO of the macroregion. At the same time, not all preferential regimes are considered, but specific for the Far East - territories of advanced socio-economic development and the free port of Vladivostok. The analysis is carried out only for territories with TOCER and SPV created in 2015-2016, taking into account the possibility of the emergence of appropriate socio-economic effects. For this purpose, a monitoring index of the level of socio-economic development of municipalities was compiled and calculated. The effects of additionality for the applied support measures are also evaluated. The results showed that for 2013-2020 the level of socio-economic development of the municipalities of the Far Eastern Federal District has increased and there has been a reduction in differences within the federal district. In general, the overall "effect of additionality" of the functioning of TASED and FPV is positive. The maximum local effect is observed in municipalities with a low level of socio-economic development and where preferential regimes occupy most of the territory of the region. At the same time, it is established that at this stage the activity of preferential regimes does not provide a sustainable and systematic improvement of the socio-economic situation. The results of this study will be useful to the executive authorities to assess the effectiveness of the functioning of the TASED and FPV.
{"title":"Dynamics of socio-economic development of municipalities with preferential regimes in the Far East in 2013-2020","authors":"D. Zemlianskii, V. Chuzhenkova","doi":"10.21638/spbu07.2022.303","DOIUrl":"https://doi.org/10.21638/spbu07.2022.303","url":null,"abstract":"The development of the Far Eastern Federal District is a priority of the federal investment and regional policy. To create new jobs and attract private investment to the territory of the district, preferential regimes are being created in the macroregion – Special economic Zones (SEZ), Territories of advanced socio-economic development (TASED), the Free Port of Vladivostok (FPV), etc. The article analyzes the differences in the dynamics of socio-economic development of municipalities (hereinafter referred to as MO), on the territory of which preferential regimes operate with other MO of the macroregion. At the same time, not all preferential regimes are considered, but specific for the Far East - territories of advanced socio-economic development and the free port of Vladivostok. The analysis is carried out only for territories with TOCER and SPV created in 2015-2016, taking into account the possibility of the emergence of appropriate socio-economic effects. For this purpose, a monitoring index of the level of socio-economic development of municipalities was compiled and calculated. The effects of additionality for the applied support measures are also evaluated. The results showed that for 2013-2020 the level of socio-economic development of the municipalities of the Far Eastern Federal District has increased and there has been a reduction in differences within the federal district. In general, the overall \"effect of additionality\" of the functioning of TASED and FPV is positive. The maximum local effect is observed in municipalities with a low level of socio-economic development and where preferential regimes occupy most of the territory of the region. At the same time, it is established that at this stage the activity of preferential regimes does not provide a sustainable and systematic improvement of the socio-economic situation. The results of this study will be useful to the executive authorities to assess the effectiveness of the functioning of the TASED and FPV.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89859249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.405
S. V. Osipov, A. Gurov
The purpose of the study is to form the methodology for assessing the state and monitoring of the territory on the basis of landscape mapping of anthropogenic geocomplexes/geosystems. The algorithm and technological scheme for assessing the state and monitoring of the area has the following components: 1) determination of the territorial level and approximate scale of mapping of anthropogenic geocomplexes; 2) selection of the classification of anthropogenic geocomplexes and it revision; 3) development of a geoinformation system and preparation of the layer (mapping) of anthropogenic geocomplexes of the selected level; 4) characteristics and assessment of the state of the area based on the analysis of the map and the spectra of anthropogenic geocomplexes; 5) comparative analysis of the state of the area at different periods – monitoring, it repeats blocks 3 and 4 for another period. The structural-functional classification of anthropogenic geocomplexes is developed. The ‘Anthropogenic geocomplexes of Primorsky Krai’ geoinformation system has been developed. Its main content consists of a set of layers, such as anthropogenic meso-landscapes, made for the entire area of the Primorsky Krai, as well as anthropogenic micro-landscapes, anthropogenic localities and anthropogenic landscapes, which are prepared for key areas. The map of anthropogenic geocomplexes/geosystems is the most important component of the technology under consideration. The indispensability of the map of techno-natural, natural-technical and technical micro-landscapes, meso-landscapes, localities or landscapes is that it gives a diverse, complex vision of the most transformed by human activity geocomplexes, their diversity, dynamics, ratio, distribution. This map allows assessing the state and tracking changes in the most important complex characteristics of the territory, first of all, the nature and degree of the transformation. Such a map is a good complement to any technology for assessing the state and monitoring the territory. When mapping anthropogenic (technical, natural-technical and techno-natural) geocomplexes, when natural geocomplexes are not involved, significantly less labor and time costs are required for creating a geoinformation system and preparing a map. In this case, mapping only anthropogenic geocomplexes is a very informative express method of assessment, analysis, and monitoring.
{"title":"Geoecological assessment and monitoring of the territory: the technology based on landscape mapping of anthropogenic geocomplexes","authors":"S. V. Osipov, A. Gurov","doi":"10.21638/spbu07.2022.405","DOIUrl":"https://doi.org/10.21638/spbu07.2022.405","url":null,"abstract":"The purpose of the study is to form the methodology for assessing the state and monitoring of the territory on the basis of landscape mapping of anthropogenic geocomplexes/geosystems. The algorithm and technological scheme for assessing the state and monitoring of the area has the following components: 1) determination of the territorial level and approximate scale of mapping of anthropogenic geocomplexes; 2) selection of the classification of anthropogenic geocomplexes and it revision; 3) development of a geoinformation system and preparation of the layer (mapping) of anthropogenic geocomplexes of the selected level; 4) characteristics and assessment of the state of the area based on the analysis of the map and the spectra of anthropogenic geocomplexes; 5) comparative analysis of the state of the area at different periods – monitoring, it repeats blocks 3 and 4 for another period. The structural-functional classification of anthropogenic geocomplexes is developed. The ‘Anthropogenic geocomplexes of Primorsky Krai’ geoinformation system has been developed. Its main content consists of a set of layers, such as anthropogenic meso-landscapes, made for the entire area of the Primorsky Krai, as well as anthropogenic micro-landscapes, anthropogenic localities and anthropogenic landscapes, which are prepared for key areas. The map of anthropogenic geocomplexes/geosystems is the most important component of the technology under consideration. The indispensability of the map of techno-natural, natural-technical and technical micro-landscapes, meso-landscapes, localities or landscapes is that it gives a diverse, complex vision of the most transformed by human activity geocomplexes, their diversity, dynamics, ratio, distribution. This map allows assessing the state and tracking changes in the most important complex characteristics of the territory, first of all, the nature and degree of the transformation. Such a map is a good complement to any technology for assessing the state and monitoring the territory. When mapping anthropogenic (technical, natural-technical and techno-natural) geocomplexes, when natural geocomplexes are not involved, significantly less labor and time costs are required for creating a geoinformation system and preparing a map. In this case, mapping only anthropogenic geocomplexes is a very informative express method of assessment, analysis, and monitoring.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87828633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.406
E. Elsukova, I. S. Nedbaev, D. S. Kuzmina
The soils of the Kingiseppsky district of the Leningrad region were studied in the zone of influence of the production of phosphorus fertilizers at a distance of up to 5 km from the pollution source. In 43 soil samples, the total content and mobile forms of heavy metals, sulfur, fluorine, phosphorus, calcium, magnesium, carbon, actual and potential acidity were determined. Three types of territories have been identified – conditionally background, reclaimed quarries, large man-made objects - phosphogypsum dumps and tailings. Exceedances of the MPC of mobile forms of elements in the conditionally background territory were revealed for copper, and for man-made objects - for manganese, copper, lead, nickel and zinc. The maximum gross content (in mg/kg) of barium (877), cadmium (1.5), copper (63), nickel (105), strontium (17,000), vanadium (218), zinc (107), antimony (1 ,86), chromium (103), phosphorus (13904), sulfur (1100) are typical for soils of technogenic objects. Barium, cobalt, manganese, lead, scandium, iron are evenly distributed over the study area. The average gross content of barium is 530, cadmium - 0.19, cobalt - 6, chromium - 32, copper - 14, iron - 22834, nickel - 16, manganese - 510, lead - 21, antimony - 0.36, scandium - 7 , vanadium - 48, zinc - 49, strontium - 627 mg/kg. At the same time, barium and lead are characterized by low variation; medium - cobalt, chromium, iron, manganese, scandium, zinc; high - copper, nickel, antimony, vanadium; abnormally high - cadmium and strontium. Medium mobility is characteristic of barium, increased mobility is characteristic of lead and nickel, manganese, copper and zinc are characterized by high mobility. Concentration coefficients of chemical elements in the soils of large technogenic objects calculated from the zonal background for podzolic soils: V(1.03); Zn(1,2); Ni(1,2); Cu(1.4); Sb(1.5); Pb(1.7); F(7,3); Ba(8); P(11.6); Sr(12.9); Ca(38.6). On the conditionally background territory: Zn (1,2); P(1,3); pb(2,2); F(1.5); Ba(12). Significant soil pollution and a decrease in the amount of organic matter are observed at man-made objects. In the conditionally background area, the amount and concentration of pollutants are decreasing. It is necessary to constantly monitor the ecological state of soils, especially their chemical pollution.
{"title":"Monitoring of soil pollution in the area affected by the production of phosphorus fertilizers","authors":"E. Elsukova, I. S. Nedbaev, D. S. Kuzmina","doi":"10.21638/spbu07.2022.406","DOIUrl":"https://doi.org/10.21638/spbu07.2022.406","url":null,"abstract":"The soils of the Kingiseppsky district of the Leningrad region were studied in the zone of influence of the production of phosphorus fertilizers at a distance of up to 5 km from the pollution source. In 43 soil samples, the total content and mobile forms of heavy metals, sulfur, fluorine, phosphorus, calcium, magnesium, carbon, actual and potential acidity were determined. Three types of territories have been identified – conditionally background, reclaimed quarries, large man-made objects - phosphogypsum dumps and tailings. Exceedances of the MPC of mobile forms of elements in the conditionally background territory were revealed for copper, and for man-made objects - for manganese, copper, lead, nickel and zinc. The maximum gross content (in mg/kg) of barium (877), cadmium (1.5), copper (63), nickel (105), strontium (17,000), vanadium (218), zinc (107), antimony (1 ,86), chromium (103), phosphorus (13904), sulfur (1100) are typical for soils of technogenic objects. Barium, cobalt, manganese, lead, scandium, iron are evenly distributed over the study area. The average gross content of barium is 530, cadmium - 0.19, cobalt - 6, chromium - 32, copper - 14, iron - 22834, nickel - 16, manganese - 510, lead - 21, antimony - 0.36, scandium - 7 , vanadium - 48, zinc - 49, strontium - 627 mg/kg. At the same time, barium and lead are characterized by low variation; medium - cobalt, chromium, iron, manganese, scandium, zinc; high - copper, nickel, antimony, vanadium; abnormally high - cadmium and strontium. Medium mobility is characteristic of barium, increased mobility is characteristic of lead and nickel, manganese, copper and zinc are characterized by high mobility. Concentration coefficients of chemical elements in the soils of large technogenic objects calculated from the zonal background for podzolic soils: V(1.03); Zn(1,2); Ni(1,2); Cu(1.4); Sb(1.5); Pb(1.7); F(7,3); Ba(8); P(11.6); Sr(12.9); Ca(38.6). On the conditionally background territory: Zn (1,2); P(1,3); pb(2,2); F(1.5); Ba(12). Significant soil pollution and a decrease in the amount of organic matter are observed at man-made objects. In the conditionally background area, the amount and concentration of pollutants are decreasing. It is necessary to constantly monitor the ecological state of soils, especially their chemical pollution.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86696769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.21638/spbu07.2022.306
A. Glebova, I. Sergeev, Nikolay Bykov
The article is devoted to the identification of landscape patterns of the location of archaeological sites in the South-East Altai using GIS and machine learning. The information database of archaeological sites of South-Eastern Altai was created based on literary sources, the authors' own field research. Schemes of distribution of archaeological sites according to some landscape features: absolute height; position in relation to watercourses; slopes; exposition; solar radiation intensity in June; Intensities of solar radiation for December was created on the basis of geoinformation analysis of the relief of the territory and the available archaeological data. The obtained statistical regularities of the distribution of archaeological sites in the landscapes of South-Eastern Altai were the basis for the creation and verification of the algorithm of a machine-learning model - a neural network. Based on the results, a forecast map of the location of archaeological sites was created. The greatest probability of discovering new archaeological objects could be provided by the following landscape parameters, no further than 500-600 m from the river with a slope steepness of up to 4 degrees, with high intensity and summer (June) solar radiation and with an exposure of slopes: southern, south-eastern and western. Unexplored archaeological sites in South-East Altai are most likely located along river valleys in the middle and lower reaches, at the confluence of rivers, along the periphery of intermountain basins, or on wide flat areas of above-floodplain terraces of river valleys. The data obtained make it possible to assess the contribution of landscape features to the spatial distribution of religious buildings of ancient peoples and provide opportunities for the search for new archaeological sites.
{"title":"Geoinformation analysis with the construction of a neural network model for predicting location of archaeological monuments in the landscapes of South-Eastern Altai","authors":"A. Glebova, I. Sergeev, Nikolay Bykov","doi":"10.21638/spbu07.2022.306","DOIUrl":"https://doi.org/10.21638/spbu07.2022.306","url":null,"abstract":"The article is devoted to the identification of landscape patterns of the location of archaeological sites in the South-East Altai using GIS and machine learning. The information database of archaeological sites of South-Eastern Altai was created based on literary sources, the authors' own field research. Schemes of distribution of archaeological sites according to some landscape features: absolute height; position in relation to watercourses; slopes; exposition; solar radiation intensity in June; Intensities of solar radiation for December was created on the basis of geoinformation analysis of the relief of the territory and the available archaeological data. The obtained statistical regularities of the distribution of archaeological sites in the landscapes of South-Eastern Altai were the basis for the creation and verification of the algorithm of a machine-learning model - a neural network. Based on the results, a forecast map of the location of archaeological sites was created. The greatest probability of discovering new archaeological objects could be provided by the following landscape parameters, no further than 500-600 m from the river with a slope steepness of up to 4 degrees, with high intensity and summer (June) solar radiation and with an exposure of slopes: southern, south-eastern and western. Unexplored archaeological sites in South-East Altai are most likely located along river valleys in the middle and lower reaches, at the confluence of rivers, along the periphery of intermountain basins, or on wide flat areas of above-floodplain terraces of river valleys. The data obtained make it possible to assess the contribution of landscape features to the spatial distribution of religious buildings of ancient peoples and provide opportunities for the search for new archaeological sites.","PeriodicalId":41676,"journal":{"name":"Vestnik of Saint Petersburg University Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81634197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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