Pub Date : 2024-04-22DOI: 10.1134/s0001437024010090
A. M. Petrischevsky
Abstract
Rheological layering of the tectonosphere of the South China Sea (SCS) on the crust—rigid (the depth interval of 5–30 km), viscous subcrustal (the depth interval of 30–70 km), rigid lower lithospheric (50–90 km), astenospheric (80–150 km) and rigid subastenospheric (the depth interval is more than 150 km)—is established. Distributions of the density inhomogeneities related to the main tectonic events in the SCS are caused by the Paleo-Pacific’s convergence, and later, the oceanic Philippine Plate, with the Philippine archipelago and later, with the Asian margin. In this zone, based on density contrast distributions in the tectonosphere, Cenozoic processes of a subduction, stretching, transform shift and structure of the central type of the probable plume nature are traced, which form an evolutionary sequence: back-arc, or paleoceanic spreading → Philippine subduction → NE-stretching with discplacement → formation of a central type of structure, probably with a plume origin. The structures caused by convergence of the Asian continent with the Indo-Australian Plate are isolated from the West Pacific margin, and underthrusting of rigid lithospheric plates from the south under the lithosphere of the marginal sea reflects traces of a more ancient collision of fragments of Gondwana with the Asian continent.
{"title":"Crust and Upper Mantle of the South China Sea (Probabilistic-Deterministic Gravity Model)","authors":"A. M. Petrischevsky","doi":"10.1134/s0001437024010090","DOIUrl":"https://doi.org/10.1134/s0001437024010090","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Rheological layering of the tectonosphere of the South China Sea (SCS) on the crust—rigid (the depth interval of 5–30 km), viscous subcrustal (the depth interval of 30–70 km), rigid lower lithospheric (50–90 km), astenospheric (80–150 km) and rigid subastenospheric (the depth interval is more than 150 km)—is established. Distributions of the density inhomogeneities related to the main tectonic events in the SCS are caused by the Paleo-Pacific’s convergence, and later, the oceanic Philippine Plate, with the Philippine archipelago and later, with the Asian margin. In this zone, based on density contrast distributions in the tectonosphere, Cenozoic processes of a subduction, stretching, transform shift and structure of the central type of the probable plume nature are traced, which form an evolutionary sequence: back-arc, or paleoceanic spreading → Philippine subduction → NE-stretching with discplacement → formation of a central type of structure, probably with a plume origin. The structures caused by convergence of the Asian continent with the Indo-Australian Plate are isolated from the West Pacific margin, and underthrusting of rigid lithospheric plates from the south under the lithosphere of the marginal sea reflects traces of a more ancient collision of fragments of Gondwana with the Asian continent.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"15 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140799280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437024010065
S. A. Kovachev, N. V. Libina
Abstract
Seismotectonic and seismoacoustic studies carried out during an expedition onboard the R/V Akademik Boris Petrov in the Pechora Sea revealed a paleoseismic dislocation confined to a fault zone tracing the North Ural seismic lineament. The amplitude of this dislocation (the relative displacement of its sides) makes it possible to estimate the magnitude of the paleoearthquake that occurred within the North Ural lineament. This magnitude was used to estimate the maximum seismic impacts on offshore oil and gas facilities already in operation and those being designed for construction in the northeastern Pechora Sea. These estimates differ significantly from estimates made previously. The method of searching for paleoseismic dislocations using seismoacoustic methods, as well as lineament analysis, can be used for initial assessment seismic impacts in water areas, including the Laptev Sea, as the most seismically active region of the Arctic.
AbstractSeismotectonic and seismoacoustic studies conducted during an expedition on the R/V Akademik Boris Petrov in the Pechora Sea revealed a paleosemic dislocation confined to a fault zone tracing the North Ural seismic lineament.根据这一错位的振幅（其两侧的相对位移），可以估算出在北乌拉尔地震带内发生的古地震的震级。这个震级被用来估算地震对佩乔拉海东北部已经运行和正在设计建造的海上石油和天然气设施的最大影响。这些估算结果与之前的估算结果大相径庭。利用地震声学方法寻找古地震错位的方法以及线状分析，可用于初步评估水域的地震影响，包括拉普捷夫海这个北极地震最活跃的地区。
{"title":"Assessment of Initial Seismicity for Offshore Platforms: a Case Study of the Pechora Sea","authors":"S. A. Kovachev, N. V. Libina","doi":"10.1134/s0001437024010065","DOIUrl":"https://doi.org/10.1134/s0001437024010065","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Seismotectonic and seismoacoustic studies carried out during an expedition onboard the R/V <i>Akademik Boris Petrov</i> in the Pechora Sea revealed a paleoseismic dislocation confined to a fault zone tracing the North Ural seismic lineament. The amplitude of this dislocation (the relative displacement of its sides) makes it possible to estimate the magnitude of the paleoearthquake that occurred within the North Ural lineament. This magnitude was used to estimate the maximum seismic impacts on offshore oil and gas facilities already in operation and those being designed for construction in the northeastern Pechora Sea. These estimates differ significantly from estimates made previously. The method of searching for paleoseismic dislocations using seismoacoustic methods, as well as lineament analysis, can be used for initial assessment seismic impacts in water areas, including the Laptev Sea, as the most seismically active region of the Arctic.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"18 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437024010119
N. V. Solovjova, I. V. Kovalyova
Abstract—
The article presents the results of simulation research of the ecological risk for three shelf areas of the Black Sea exposed to different combinations of external stressors. Simulated risk calculations were performed for the aggregated phytoplankton taking into account the intra-annual variations in biomass values obtained from observation data. The results revealed a significant dependence of the ecological risk on the intra-annual state of phytoplankton and also made it possible to calculate the dependence of the permissible probability of impacts on ecological risk. The latter identified areas of probable errors of the second kind, which is of practical importance for ensuring ecological safety in the shelf resources development.
{"title":"Simulation-Based Ecological Risk Assessment of the Black Sea Ecosystem","authors":"N. V. Solovjova, I. V. Kovalyova","doi":"10.1134/s0001437024010119","DOIUrl":"https://doi.org/10.1134/s0001437024010119","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The article presents the results of simulation research of the ecological risk for three shelf areas of the Black Sea exposed to different combinations of external stressors. Simulated risk calculations were performed for the aggregated phytoplankton taking into account the intra-annual variations in biomass values obtained from observation data. The results revealed a significant dependence of the ecological risk on the intra-annual state of phytoplankton and also made it possible to calculate the dependence of the permissible probability of impacts on ecological risk. The latter identified areas of probable errors of the second kind, which is of practical importance for ensuring ecological safety in the shelf resources development.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"95 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437023050077
I. O. Murdmaa, O. M. Dara, M. A. Lykova, D. G. Borisov, E. V. Ivanova
Abstract
The content of sediment-forming minerals in two cores from the eastern (ANS45-37) and western (ANS45-48) parts of the valley of the Vema Fracture Zone is studied using semiquantitative XRD analysis of bulk powder sediment samples. The mineral composition of deep-sea sediments from the Amazone Cone is also analyzed for comparison. It appeared that the average composition of the terrigenous component of both cores (according to prevailing quartz, secondary mica, plagioclase and potassium feldspar, as well as smectite, chlorite, kaolinite, illite) is quite similar and approximately corresponds to the composition of sediments from the Amazon Cone. The ratio of four clay minerals suggests supply of terrigenous material to the Amazon and Orinoco due to erosion of the Andes and humid tropical weathering in the lower courses of the rivers with further transport of the suspended load to the ocean. This material was transported to the valley of the Vema Fracture Zone due to interplay between gravitational flows from the South American continental slope and current of Antarctic Bottom Water. In addition, data on biogenic calcite (planktic foraminiferal tests, nannofossils) and opal A (radiolarians, sponge spicules) have been obtained. In the study area, several authigenic (diagenetic) minerals are identified. In particular, siderite and greigite are first found in the sediments from the Vema valley and Amazon Cone, respectively.
{"title":"Mineralogy of Quaternary Sediments from the Vema Fracture Zone Valley (Central Atlantic)","authors":"I. O. Murdmaa, O. M. Dara, M. A. Lykova, D. G. Borisov, E. V. Ivanova","doi":"10.1134/s0001437023050077","DOIUrl":"https://doi.org/10.1134/s0001437023050077","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The content of sediment-forming minerals in two cores from the eastern (ANS45-37) and western (ANS45-48) parts of the valley of the Vema Fracture Zone is studied using semiquantitative XRD analysis of bulk powder sediment samples. The mineral composition of deep-sea sediments from the Amazone Cone is also analyzed for comparison. It appeared that the average composition of the terrigenous component of both cores (according to prevailing quartz, secondary mica, plagioclase and potassium feldspar, as well as smectite, chlorite, kaolinite, illite) is quite similar and approximately corresponds to the composition of sediments from the Amazon Cone. The ratio of four clay minerals suggests supply of terrigenous material to the Amazon and Orinoco due to erosion of the Andes and humid tropical weathering in the lower courses of the rivers with further transport of the suspended load to the ocean. This material was transported to the valley of the Vema Fracture Zone due to interplay between gravitational flows from the South American continental slope and current of Antarctic Bottom Water. In addition, data on biogenic calcite (planktic foraminiferal tests, nannofossils) and opal A (radiolarians, sponge spicules) have been obtained. In the study area, several authigenic (diagenetic) minerals are identified. In particular, siderite and greigite are first found in the sediments from the Vema valley and Amazon Cone, respectively.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"86 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437024010028
D. A. Antonenkov
Abstract
At present, river estuaries are constantly being explored; therefore, it is necessary to receive up-to-date information on their actual environmental condition, hydrological regime, and geographical features. Therefore, it is important to develop and improve the methods and technical instruments for monitoring river estuaries. The article presents a developed methodology for integrated research of small-river estuaries using new methods and techniques. The article discusses the experience in using modern domestic devices for solving practical problems of integrated water-environmental monitoring with a case study of expeditionary work in estuaries of the Chernaya River (Crimean Peninsula, Sevastopol). The possibilities of the following technical instruments used are described: The GAP-AK-12R CTD (MHI RAS), the Condor biophysical complex (Aquastandard), and the Garmin echo sounder, which make it possible to obtain field data on turbidity, the concentration of suspended particulate matter, speed and direction of currents, the average size of suspended particles, and salinity and temperature of the aquatic environment. The results of applying a new method for determining the flow velocity and water consumption based on video image processing are presented. Application of the developed methodology makes it possible to obtain the information necessary to analyze the hydrological regime and ecological state of small-river estuaries.
{"title":"Modern Methods and Technical Instruments of Ecological Monitoring of the Estuaries of Small Rivers","authors":"D. A. Antonenkov","doi":"10.1134/s0001437024010028","DOIUrl":"https://doi.org/10.1134/s0001437024010028","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>At present, river estuaries are constantly being explored; therefore, it is necessary to receive up-to-date information on their actual environmental condition, hydrological regime, and geographical features. Therefore, it is important to develop and improve the methods and technical instruments for monitoring river estuaries. The article presents a developed methodology for integrated research of small-river estuaries using new methods and techniques. The article discusses the experience in using modern domestic devices for solving practical problems of integrated water-environmental monitoring with a case study of expeditionary work in estuaries of the Chernaya River (Crimean Peninsula, Sevastopol). The possibilities of the following technical instruments used are described: The GAP-AK-12R CTD (MHI RAS), the Condor biophysical complex (Aquastandard), and the Garmin echo sounder, which make it possible to obtain field data on turbidity, the concentration of suspended particulate matter, speed and direction of currents, the average size of suspended particles, and salinity and temperature of the aquatic environment. The results of applying a new method for determining the flow velocity and water consumption based on video image processing are presented. Application of the developed methodology makes it possible to obtain the information necessary to analyze the hydrological regime and ecological state of small-river estuaries.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"34 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437024010077
M. V. Mityaev, M. V. Gerasimova, S. S. Malavenda
Abstract
A five-year observation (2017–2022) of the abrasive erosion of rocks in the littoral and upper sublittoral zone of Dalnezelenetskaya Bay (Murmansk coast) was carried out During this period, a slow rock erosion rate was observed not only in the upper sublittoral zone, but also throughout the coastal littoral zone. It was revealed that the erosion rate of coarse-clastic material in 2017–2022 averaged 15 ± 3 µm g–1. The greatest influence on the intensity of erosion was exerted by storms generated by easterly and southeasterly winds 7–12 m/s. It has been established that in 2021–2022, abrasive erosion of rocks in the sublittoral zone of the Murmansk coast intensified. Based on an analysis of hydrological, meteorological, and seismic data, it is suggested that activation of the abrasion process was caused by an increased number of storm periods; perhaps the tectonic activity of disjunctive structures on the coast played an important role in this. The data obtained indicate that changes in the temperature and salinity of the water mass in the bay have no significant effect on the abrasion rate.
{"title":"Change in the Rock Erosion Rate in the Upper Sublittoral Zone of the Murmansk Coast","authors":"M. V. Mityaev, M. V. Gerasimova, S. S. Malavenda","doi":"10.1134/s0001437024010077","DOIUrl":"https://doi.org/10.1134/s0001437024010077","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A five-year observation (2017–2022) of the abrasive erosion of rocks in the littoral and upper sublittoral zone of Dalnezelenetskaya Bay (Murmansk coast) was carried out During this period, a slow rock erosion rate was observed not only in the upper sublittoral zone, but also throughout the coastal littoral zone. It was revealed that the erosion rate of coarse-clastic material in 2017–2022 averaged 15 ± 3 µm g<sup>–1</sup>. The greatest influence on the intensity of erosion was exerted by storms generated by easterly and southeasterly winds 7–12 m/s. It has been established that in 2021–2022, abrasive erosion of rocks in the sublittoral zone of the Murmansk coast intensified. Based on an analysis of hydrological, meteorological, and seismic data, it is suggested that activation of the abrasion process was caused by an increased number of storm periods; perhaps the tectonic activity of disjunctive structures on the coast played an important role in this. The data obtained indicate that changes in the temperature and salinity of the water mass in the bay have no significant effect on the abrasion rate.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"155 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-22DOI: 10.1134/s0001437024010053
E. P. Dubinin, A. V. Kokhan, N. M. Suschevskaya
Abstract
Based on an analysis of global digital models, the distribution of fracture zones of the oceanic crust, global and regional models of evolution, and published geological and geophysical data, the structural features of the ocean floor in the junction area of the Indian and Atlantic oceans are considered. Tectonic zoning of the region’s crust has been carried out. Heterogeneous blocks of the lithosphere with crust formed on different spreading ridges, separated by structural boundaries, which are pseudofaults, fixing traces of propagating rift zones, jumping and cessation of spreading ridges are identified. The main stages in the evolution of the lithosphere associated with the activation of plume magmatism and kinematic reorganizations of plate boundaries are identified.
{"title":"Tectonic Structure and Evolution of the Lithosphere in the Near-Antarctic Part of the South Atlantic","authors":"E. P. Dubinin, A. V. Kokhan, N. M. Suschevskaya","doi":"10.1134/s0001437024010053","DOIUrl":"https://doi.org/10.1134/s0001437024010053","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Based on an analysis of global digital models, the distribution of fracture zones of the oceanic crust, global and regional models of evolution, and published geological and geophysical data, the structural features of the ocean floor in the junction area of the Indian and Atlantic oceans are considered. Tectonic zoning of the region’s crust has been carried out. Heterogeneous blocks of the lithosphere with crust formed on different spreading ridges, separated by structural boundaries, which are pseudofaults, fixing traces of propagating rift zones, jumping and cessation of spreading ridges are identified. The main stages in the evolution of the lithosphere associated with the activation of plume magmatism and kinematic reorganizations of plate boundaries are identified.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140806381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s0001437023070032
E. A. Ezhova, A. V. Gavrikov, V. D. Sharmar, N. D. Tilinina, A. I. Suslov, V. S. Koshkina, M. A. Krinitskiy, V. S. Gladyshev, M. A. Borisov
Abstract
The lack of automatic wave measurement equipment leads to a decrease in the number of observations. Which, in turn, leads to a decrease in the quality of numerical forecasting. This paper presents an algorithm for obtaining wind wave parameters (significant height, period and direction of the main wave system) using a marine radar. This approach has the potential to significantly expand the coverage and increase the number of observations. The methods utilized in this research involve spectral analysis of time series images of the sea surface. The field measurements of waves in the drift and on the move of the ship obtained during the AI57, AI58 and AI63 sea expeditions conducted between 2021 and 2022 aboard a research vessel AkademikIoffe. The accuracy of the algorithm is confirmed through validation against data acquired from wave buoys, altimetry satellites, and visual observations.
Abstract The lack of automatic wave measurement equipment leads to the decrease of the number of observations.这反过来又导致数值预报质量的下降。本文介绍了一种利用海洋雷达获取风浪参数（主波系统的显著高度、周期和方向）的算法。这种方法有可能大大扩大覆盖范围，增加观测次数。本研究采用的方法涉及海面时间序列图像的光谱分析。在 2021 年至 2022 年期间，Akademik Ioffe 号科考船进行了 AI57、AI58 和 AI63 海上考察，对漂流中的波浪和船只移动中的波浪进行了实地测量。通过对波浪浮标、测高卫星和目测数据的验证，确认了算法的准确性。
{"title":"Obtaining Wind Waves Parameters Using Ship Radar","authors":"E. A. Ezhova, A. V. Gavrikov, V. D. Sharmar, N. D. Tilinina, A. I. Suslov, V. S. Koshkina, M. A. Krinitskiy, V. S. Gladyshev, M. A. Borisov","doi":"10.1134/s0001437023070032","DOIUrl":"https://doi.org/10.1134/s0001437023070032","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The lack of automatic wave measurement equipment leads to a decrease in the number of observations. Which, in turn, leads to a decrease in the quality of numerical forecasting. This paper presents an algorithm for obtaining wind wave parameters (significant height, period and direction of the main wave system) using a marine radar. This approach has the potential to significantly expand the coverage and increase the number of observations. The methods utilized in this research involve spectral analysis of time series images of the sea surface. The field measurements of waves in the drift and on the move of the ship obtained during the AI57, AI58 and AI63 sea expeditions conducted between 2021 and 2022 aboard a research vessel <i>Akademik</i> <i>Ioffe</i>. The accuracy of the algorithm is confirmed through validation against data acquired from wave buoys, altimetry satellites, and visual observations.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"65 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s0001437023070147
M. A. Pavlova, D. I. Glukhovets, V. D. Volodin
Abstract
The results of the development and field testing of a compact high-speed deck spectroradiometer for remote sensing reflectance measurements are presented. Validation using data obtained with hydrooptical equipment showed that the new device makes it possible to measure data on remote sensing reflectance with an accuracy sufficient for calculating bio-optical characteristics. Based on the data obtained during field tests of the new device, processed using regional algorithms, the values of the bio-optical characteristics of the Kara and Black seas surface waters were quantitatively assessed.
{"title":"Deck Spectroradiometer for Measuring Remote Sensing Reflectance","authors":"M. A. Pavlova, D. I. Glukhovets, V. D. Volodin","doi":"10.1134/s0001437023070147","DOIUrl":"https://doi.org/10.1134/s0001437023070147","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the development and field testing of a compact high-speed deck spectroradiometer for remote sensing reflectance measurements are presented. Validation using data obtained with hydrooptical equipment showed that the new device makes it possible to measure data on remote sensing reflectance with an accuracy sufficient for calculating bio-optical characteristics. Based on the data obtained during field tests of the new device, processed using regional algorithms, the values of the bio-optical characteristics of the Kara and Black seas surface waters were quantitatively assessed.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"47 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140020015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1134/s0001437023070123
E. V. Novoselova, T. V. Belonenko, S. M. Gordeeva, M. V. Budyansky
Abstract—
In situ temperature measurements along the Kola Transect for 1993–2019 are compared to climate indices for the North Atlantic, developed by the authors in earlier works. Five climate indices are considered: PC1, PC2, NAT, NAT1, and NAT2. It is shown that the temperature time series along the Kola Transect correlate well with climate indices PC2, as well as NAT1 and NAT2, which are responsible for warming processes in the cold North European Basin and cooling processes in the warm region south of Iceland. The correlation coefficients reach 0.80. At the same time, there is a low correlation between the temperature along the Kola Transect and the PC1 and NAT indices, which represent the volume flux of water entering the North European Basin from the Atlantic. This implies that the thermal state of the Atlantic waters entering the Barents Sea and the water temperature along the Kola Meridian are determined by the thermal state of the waters rather than the volume flux of Atlantic waters. A high consistency is found between the in situ measurements along the Kola Transect and the corresponding data from the GLORYS12V1 global ocean reanalysis. It is shown that the northern boundary of the Coastal Branch of the Murmansk Current can reach 71.5°–72° N.
{"title":"The Atlantic Gateway to the Arctic in the Mirror of the Kola Transect","authors":"E. V. Novoselova, T. V. Belonenko, S. M. Gordeeva, M. V. Budyansky","doi":"10.1134/s0001437023070123","DOIUrl":"https://doi.org/10.1134/s0001437023070123","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>In situ temperature measurements along the Kola Transect for 1993–2019 are compared to climate indices for the North Atlantic, developed by the authors in earlier works. Five climate indices are considered: PC1, PC2, NAT, NAT1, and NAT2. It is shown that the temperature time series along the Kola Transect correlate well with climate indices PC2, as well as NAT1 and NAT2, which are responsible for warming processes in the cold North European Basin and cooling processes in the warm region south of Iceland. The correlation coefficients reach 0.80. At the same time, there is a low correlation between the temperature along the Kola Transect and the PC1 and NAT indices, which represent the volume flux of water entering the North European Basin from the Atlantic. This implies that the thermal state of the Atlantic waters entering the Barents Sea and the water temperature along the Kola Meridian are determined by the thermal state of the waters rather than the volume flux of Atlantic waters. A high consistency is found between the in situ measurements along the Kola Transect and the corresponding data from the GLORYS12V1 global ocean reanalysis. It is shown that the northern boundary of the Coastal Branch of the Murmansk Current can reach 71.5°–72° N.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"61 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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