Pub Date : 2024-07-02DOI: 10.1134/s0001437024700152
D. V. Dorokhov, E. V. Dorokhova, A. A. Kondrashov, Yu. Yu. Polunina, A. Yu. Sergeev, I. Yu. Dudkov
Abstract
The article presents brief results of expeditionary studies of the Southeastern Baltic Sea and eastern Gulf of Finland during cruise 53 of the R/V Akademik Boris Petrov (2023). The expedition was a continuation of longstanding oceanological research conducted by the Atlantic Branch of the Shirshov Institute of Oceanology, Russian Academy of Sciences. Integrated geological, geophysical, hydrological, hydrochemical, hydrobiological, and geoecological research was carried out. New data on the state and dynamic of natural systems of the Baltic Sea were obtained.
摘要 本文简要介绍了 Akademik Boris Petrov 号考察船第 53 次航行（2023 年）期间对波罗的海东南部和芬兰湾东部进行考察研究的结果。此次考察是俄罗斯科学院希尔绍夫海洋学研究所大西洋分所长期海洋学研究的延续。开展了地质、地球物理、水文、水化学、水生物和地质生态综合研究。获得了有关波罗的海自然系统状态和动态的新数据。
{"title":"Environmental Studies of the Baltic Sea on Cruise 53 of the R/V Akademik Boris Petrov","authors":"D. V. Dorokhov, E. V. Dorokhova, A. A. Kondrashov, Yu. Yu. Polunina, A. Yu. Sergeev, I. Yu. Dudkov","doi":"10.1134/s0001437024700152","DOIUrl":"https://doi.org/10.1134/s0001437024700152","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article presents brief results of expeditionary studies of the Southeastern Baltic Sea and eastern Gulf of Finland during cruise 53 of the R/V <i>Akademik Boris Petrov</i> (2023). The expedition was a continuation of longstanding oceanological research conducted by the Atlantic Branch of the Shirshov Institute of Oceanology, Russian Academy of Sciences. Integrated geological, geophysical, hydrological, hydrochemical, hydrobiological, and geoecological research was carried out. New data on the state and dynamic of natural systems of the Baltic Sea were obtained.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"202 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520541","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 : 2024-07-02DOI: 10.1134/s0001437024700139
A. Zabanbark, L. I. Lobkovsky
Abstract
The principal basins on the Mozambique continental margin are the Mozambique and Rovuma, on the passive continental margin with complex tectonic history, following after the East African Rift System in the Triassic. Although the first gas fields in the coastal zone of the Indian Ocean in southeast Mozambique are appeared yet in the 1960s, only in 2010, did Mozambique achieve a new status as a major world hydrocarbon player—with the discovery of a number of large gas fields in the northeast of the country, in deep-water regions of the Indian Ocean, and in the Rovuma Basin. More than 20 recently discovered gas fields are located in deep-water regions and on the continental slope of the Indian Ocean at depths of 468–2610 m. It is noteworthy that the pays of the same age, the deeper they are buried beneath the water column, the greater their volume of hydrocarbon reserves. A similar trend may help in the case of targeted oil and gas exploration. The prospects of liquid hydrocarbon discoveries are possible in the Madagascar channel behind the Davie Ridge and in deep-water parts on the slopes of the Mozambique continental margin.
{"title":"Geological Structure and Prospects of the Oil-And-Gas-Bearing Mozambique Continental Margin","authors":"A. Zabanbark, L. I. Lobkovsky","doi":"10.1134/s0001437024700139","DOIUrl":"https://doi.org/10.1134/s0001437024700139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The principal basins on the Mozambique continental margin are the Mozambique and Rovuma, on the passive continental margin with complex tectonic history, following after the East African Rift System in the Triassic. Although the first gas fields in the coastal zone of the Indian Ocean in southeast Mozambique are appeared yet in the 1960s, only in 2010, did Mozambique achieve a new status as a major world hydrocarbon player—with the discovery of a number of large gas fields in the northeast of the country, in deep-water regions of the Indian Ocean, and in the Rovuma Basin. More than 20 recently discovered gas fields are located in deep-water regions and on the continental slope of the Indian Ocean at depths of 468–2610 m. It is noteworthy that the pays of the same age, the deeper they are buried beneath the water column, the greater their volume of hydrocarbon reserves. A similar trend may help in the case of targeted oil and gas exploration. The prospects of liquid hydrocarbon discoveries are possible in the Madagascar channel behind the Davie Ridge and in deep-water parts on the slopes of the Mozambique continental margin.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"176 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141520538","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 : 2024-05-14DOI: 10.1134/s0001437024020103
N. D. Romanova, M. A. Boltenkova, E. M. Bezzubova
Abstract—
This paper reports data on the structural and production characteristics of bacterioplankton in the western Kara Sea at the beginning and middle of summer. On the slope of the St. Anna Trough, the average prokaryote abundance in the water column was 594–708 × 103 cells mL−1 (26.4–36.5 mgC m–3) in June and 247–517 × 103 cells mL−1 (12–28 mgC m–3) at the beginning of August. On the transect along the Novaya Zemlya archipelago, the average bacterioplankton abundance in the water column was 186–554 × 103 cells mL−1 (8.5–30 mgC m–3) within a week after the seasonal ice retreat and 169–443 × 103 cells mL−1 (8–21 mgC m–3) in midsummer. The specific bacterial growth rate did not exceed 1.28 day–1; high values were observed in the upper warm water layer, above the halocline, and also in near-bottom water. At the beginning of summer, the bacterioplankton production tended to decrease in the northeast direction. The prokaryote abundance distribution was associated with water temperature and oxygen saturation possibly as an indirect indicator of the past phytoplankton bloom.
{"title":"Bacterioplankton in the Western Kara Sea","authors":"N. D. Romanova, M. A. Boltenkova, E. M. Bezzubova","doi":"10.1134/s0001437024020103","DOIUrl":"https://doi.org/10.1134/s0001437024020103","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>This paper reports data on the structural and production characteristics of bacterioplankton in the western Kara Sea at the beginning and middle of summer. On the slope of the St. Anna Trough, the average prokaryote abundance in the water column was 594–708 × 10<sup>3</sup> cells mL<sup>−1</sup> (26.4–36.5 mgC m<sup>–3</sup>) in June and 247–517 × 10<sup>3</sup> cells mL<sup>−1</sup> (12–28 mgC m<sup>–3</sup>) at the beginning of August. On the transect along the Novaya Zemlya archipelago, the average bacterioplankton abundance in the water column was 186–554 × 10<sup>3</sup> cells mL<sup>−1</sup> (8.5–30 mgC m<sup>–3</sup>) within a week after the seasonal ice retreat and 169–443 × 10<sup>3</sup> cells mL<sup>−1</sup> (8–21 mgC m<sup>–3</sup>) in midsummer. The specific bacterial growth rate did not exceed 1.28 day<sup>–1</sup>; high values were observed in the upper warm water layer, above the halocline, and also in near-bottom water. At the beginning of summer, the bacterioplankton production tended to decrease in the northeast direction. The prokaryote abundance distribution was associated with water temperature and oxygen saturation possibly as an indirect indicator of the past phytoplankton bloom.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"10 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931019","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 : 2024-05-14DOI: 10.1134/s0001437024020061
N. N. Dunaev, I. O. Leont’yev, T. Yu. Repkina
Abstract
Currently, most seashores are experiencing increased erosion and retreat. To a large extent, this applies to coasts subjected to the influence of high-amplitude sea tides, which is extremely negatively manifested on the accumulative coasts of oceanic islands. The problem of their dynamics, the theoretical foundations of which are still in the development stage, can only be solved on the basis of wide-regional studies. This study is aimed at elucidating the specific features of the dynamics of such a coast with a case study of the key region of a large oceanic island. The main reasons for its degradation are identified, recommendations are given for stabilizing the coastline, and the development trend according to the natural scenario is considered.
{"title":"State and Forecast of Development of the Shallow Sandy Coast of a Tidal Sea (A Case Study of Madagascar)","authors":"N. N. Dunaev, I. O. Leont’yev, T. Yu. Repkina","doi":"10.1134/s0001437024020061","DOIUrl":"https://doi.org/10.1134/s0001437024020061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Currently, most seashores are experiencing increased erosion and retreat. To a large extent, this applies to coasts subjected to the influence of high-amplitude sea tides, which is extremely negatively manifested on the accumulative coasts of oceanic islands. The problem of their dynamics, the theoretical foundations of which are still in the development stage, can only be solved on the basis of wide-regional studies. This study is aimed at elucidating the specific features of the dynamics of such a coast with a case study of the key region of a large oceanic island. The main reasons for its degradation are identified, recommendations are given for stabilizing the coastline, and the development trend according to the natural scenario is considered.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"15 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140941951","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 : 2024-05-14DOI: 10.1134/s0001437024020140
V. V. Zhmur
Abstract
The paper proposes a theory of similarity of quasi-geostrophic vortices against the background of large-scale flows. This information is useful when planning laboratory and numerical experiments to study mesoscale and submesoscale vortex dynamics of vortices interacting with currents. Special attention is paid to studying geometric similarity of phenomena. It is revealed that the complete set of dimensionless similarity numbers of baroclinic vortices includes four dimensionless parameters: the dimensionless intensity of the vortex, the geometric similarity of the background flow (the ratio of the relative vorticity to the deformation coefficient of the background flow), the coefficient of horizontal stretching of the vortex core, and the coefficient of vertical oblateness of the vortex core coinciding with the Burger number. To describe the similarity of barotropic vortices against the background of barotropic flows, the number of necessary dimensionless parameters is reduced by one number: the coefficient of vertical oblateness of the vortex core is eliminated from consideration. When studying axisymmetric vortices or vortex structures close to axisymmetric, another geometric parameter of the vortex is eliminated from consideration—the coefficient of horizontal stretching of the vortex core. As a result, the maximum possible set of similarity parameters includes four dimensionless numbers, and the minimum is two.
{"title":"On the Similarity of Quasi-Geostrophic Vortices Against the Background of Large-Scale Barotropic Currents","authors":"V. V. Zhmur","doi":"10.1134/s0001437024020140","DOIUrl":"https://doi.org/10.1134/s0001437024020140","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper proposes a theory of similarity of quasi-geostrophic vortices against the background of large-scale flows. This information is useful when planning laboratory and numerical experiments to study mesoscale and submesoscale vortex dynamics of vortices interacting with currents. Special attention is paid to studying geometric similarity of phenomena. It is revealed that the complete set of dimensionless similarity numbers of baroclinic vortices includes four dimensionless parameters: the dimensionless intensity of the vortex, the geometric similarity of the background flow (the ratio of the relative vorticity to the deformation coefficient of the background flow), the coefficient of horizontal stretching of the vortex core, and the coefficient of vertical oblateness of the vortex core coinciding with the Burger number. To describe the similarity of barotropic vortices against the background of barotropic flows, the number of necessary dimensionless parameters is reduced by one number: the coefficient of vertical oblateness of the vortex core is eliminated from consideration. When studying axisymmetric vortices or vortex structures close to axisymmetric, another geometric parameter of the vortex is eliminated from consideration—the coefficient of horizontal stretching of the vortex core. As a result, the maximum possible set of similarity parameters includes four dimensionless numbers, and the minimum is two.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"45 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931161","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 : 2024-05-14DOI: 10.1134/s0001437024020024
E. G. Arashkevich, A. V. Drits, A. F. Pasternak, S. E. Frenkel, V. A. Karmanov
Abstract
The dependence of the respiration rate (R) on an animal’s weight (W) is described by the equation R = aWb, where the exponential coefficient b is usually taken equal to 3/4. However, several authors have indicated that the value of coefficient b may vary with temperature changes, as well as during ontogeny. In Arctic seas, copepods spend most of their lives at temperatures below or close to zero. Meanwhile, there are very few respiration rate measurements at temperature ≤ 0°C, which does not allow us to estimate the value of coefficient b at subzero temperature. The study was carried out on three cruises of the R/V Akademik Mstislav Keldysh in the Siberian Arctic seas in 2018–2020. Copepods caught from the sea were adapted to the experimental temperature and placed in tightly capped vials filled with filtered seawater for 24 h. The oxygen concentration was measured with a fiber-optic oxygen probe. The results of 120 respiration rate measurements and 111 body carbon measurements in five species of copepods at a temperature of –1.5°C are presented. The obtained relationship between body carbon content (W) and prosome length (L) is described by the equation W = 6.982L3.221, and the dependence of respiration on body weight is described by the equation R = 0.077W0.753. No effect of subzero temperature on coefficient b was revealed. The parameters of regression R(W) did not change with the ontogenetic development of Calanus glacialis.
摘要呼吸速率（R）与动物体重（W）的关系用公式 R = aW b 来描述，其中指数系数 b 通常等于 3/4。不过，一些学者指出，系数 b 的值可能会随着温度变化和本体发育而变化。在北极海域，桡足类大部分时间都生活在零度以下或接近零度的环境中。同时，温度≤0°C时的呼吸速率测量数据很少，因此无法估算零下温度时的系数b值。这项研究是在 2018-2020 年 Akademik Mstislav Keldysh 号考察船在西伯利亚北极海域的三次航行中进行的。从海中捕获的桡足类适应了实验温度，并被放置在装满过滤海水的密闭小瓶中 24 小时，用光纤氧气探头测量氧气浓度。本文介绍了在 -1.5°C 温度下对五种桡足类进行的 120 次呼吸速率测量和 111 次体碳测量的结果。体碳含量（W）与前体长度（L）之间的关系用公式 W = 6.982L3.221 描述，呼吸作用与体重的关系用公式 R = 0.077W 0.753 描述。零下温度对系数 b 没有影响。回归参数 R（W）没有随冰川鲣的个体发育而变化。
{"title":"Relationship between Respiration Rate and Body Weight in Arctic Copepods at Subzero Temperature","authors":"E. G. Arashkevich, A. V. Drits, A. F. Pasternak, S. E. Frenkel, V. A. Karmanov","doi":"10.1134/s0001437024020024","DOIUrl":"https://doi.org/10.1134/s0001437024020024","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The dependence of the respiration rate (<i>R</i>) on an animal’s weight (<i>W</i>) is described by the equation <i>R</i> = <i>aW</i> <sup><i>b</i></sup>, where the exponential coefficient <i>b</i> is usually taken equal to 3/4. However, several authors have indicated that the value of coefficient <i>b</i> may vary with temperature changes, as well as during ontogeny. In Arctic seas, copepods spend most of their lives at temperatures below or close to zero. Meanwhile, there are very few respiration rate measurements at temperature ≤ 0°C, which does not allow us to estimate the value of coefficient <i>b</i> at subzero temperature. The study was carried out on three cruises of the R/V <i>Akademik Mstislav Keldysh</i> in the Siberian Arctic seas in 2018–2020. Copepods caught from the sea were adapted to the experimental temperature and placed in tightly capped vials filled with filtered seawater for 24 h. The oxygen concentration was measured with a fiber-optic oxygen probe. The results of 120 respiration rate measurements and 111 body carbon measurements in five species of copepods at a temperature of –1.5°C are presented. The obtained relationship between body carbon content (<i>W</i>) and prosome length (<i>L</i>) is described by the equation <i>W</i> = 6.982<i>L</i><sup>3.221</sup>, and the dependence of respiration on body weight is described by the equation <i>R</i> = 0.077<i>W</i> <sup>0.753</sup>. No effect of subzero temperature on coefficient <i>b</i> was revealed. The parameters of regression <i>R</i>(<i>W</i>) did not change with the ontogenetic development of <i>Calanus glacialis</i>.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"12 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931154","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 : 2024-05-14DOI: 10.1134/s0001437024020127
E. A. Streltsova, N. A. Belyaev, V. Y. Fedulov, E. M. Pushkareva
Abstract
The upper layer of bottom sediments in the northeastern Kara Sea is studied. It is shown that the sediment composition is dominated by silt, while the percentage of sand increases towards the coast. The organic carbon content (average value 1.1 wt %) is close to the average content in Kara Sea sediments, increasing at deep-sea stations. The linear correlation found between the organic carbon content and surface area of sediments shows adsorption on particle surfaces and is the predominant form of organic matter (OM) accumulation in the sediments. The average n-alkane concentration in the analyzed samples is 1.1 μg/g of sediment; the distribution spectrum is dominated by odd high-molecular homologues of terrigenous origin.
{"title":"Grain Size Distribution, Organic Carbon, and Geochemical Markers in the Surface Layer of Bottom Sediments in the Northeastern Kara Sea","authors":"E. A. Streltsova, N. A. Belyaev, V. Y. Fedulov, E. M. Pushkareva","doi":"10.1134/s0001437024020127","DOIUrl":"https://doi.org/10.1134/s0001437024020127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The upper layer of bottom sediments in the northeastern Kara Sea is studied. It is shown that the sediment composition is dominated by silt, while the percentage of sand increases towards the coast. The organic carbon content (average value 1.1 wt %) is close to the average content in Kara Sea sediments, increasing at deep-sea stations. The linear correlation found between the organic carbon content and surface area of sediments shows adsorption on particle surfaces and is the predominant form of organic matter (OM) accumulation in the sediments. The average n-alkane concentration in the analyzed samples is 1.1 μg/g of sediment; the distribution spectrum is dominated by odd high-molecular homologues of terrigenous origin.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"32 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931017","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 : 2024-05-14DOI: 10.1134/s0001437024020097
I. P. Medvedev, T. N. Ivelskaya, A. B. Rabinovich, E. S. Tsukanova, A. Yu. Medvedeva
Abstract
The Hunga Tonga–Hunga Ha’apai volcanic eruption on January 15, 2022 generated a tsunami that affected the entire Pacific Ocean. Tsunami waves from the event have been generated both by incoming waves from the source area with a long-wave speed in the ocean of ~200–220 m/s, and by an atmospheric wave propagating at a sound speed of ~315 m/s. Such a dual source mechanism created a serious problem and was a real challenge for the Pacific tsunami warning services. The work of the Russian Tsunami Warning Service (Yuzhno-Sakhalinsk) during this event is considered in detail. The tsunami was clearly recorded on the coasts of the Northwest Pacific and in the adjacent marginal seas, including the Sea of Japan, the Sea of Okhotsk, and the Bering Sea. We examined high-resolution records (1-min sampling) of 20 tide gauges and 8 air pressure stations in this region for the period of January 14–17, 2022. On the Russian coast, the highest waves, with a trough-to-crest wave height of 1.3 m, were recorded at Malokurilskoe (Shikotan Island) and Vodopadnaya (southeastern coast of Kamchatka). Using numerical simulation and data analysis methods, we were able to separate oceanic “gravity” tsunami waves from propagating atmospheric pressure waves. In general, we found that on the outer (oceanic) coasts and southern coast of the Sea of Okhotsk, oceanic tsunami waves prevailed, while on the coast of the Sea of Japan, oceanic and atmospheric tsunami waves had similar heights.
{"title":"Observations of Tsunami Waves on the Pacific Coast of Russia Originating from the Hunga Tonga–Hunga Ha’apai Volcanic Eruption on January 15, 2022","authors":"I. P. Medvedev, T. N. Ivelskaya, A. B. Rabinovich, E. S. Tsukanova, A. Yu. Medvedeva","doi":"10.1134/s0001437024020097","DOIUrl":"https://doi.org/10.1134/s0001437024020097","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Hunga Tonga–Hunga Ha’apai volcanic eruption on January 15, 2022 generated a tsunami that affected the entire Pacific Ocean. Tsunami waves from the event have been generated both by incoming waves from the source area with a long-wave speed in the ocean of ~200–220 m/s, and by an atmospheric wave propagating at a sound speed of ~315 m/s. Such a dual source mechanism created a serious problem and was a real challenge for the Pacific tsunami warning services. The work of the Russian Tsunami Warning Service (Yuzhno-Sakhalinsk) during this event is considered in detail. The tsunami was clearly recorded on the coasts of the Northwest Pacific and in the adjacent marginal seas, including the Sea of Japan, the Sea of Okhotsk, and the Bering Sea. We examined high-resolution records (1-min sampling) of 20 tide gauges and 8 air pressure stations in this region for the period of January 14–17, 2022. On the Russian coast, the highest waves, with a trough-to-crest wave height of 1.3 m, were recorded at Malokurilskoe (Shikotan Island) and Vodopadnaya (southeastern coast of Kamchatka). Using numerical simulation and data analysis methods, we were able to separate oceanic “gravity” tsunami waves from propagating atmospheric pressure waves. In general, we found that on the outer (oceanic) coasts and southern coast of the Sea of Okhotsk, oceanic tsunami waves prevailed, while on the coast of the Sea of Japan, oceanic and atmospheric tsunami waves had similar heights.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"22 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931157","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 : 2024-05-14DOI: 10.1134/s0001437024020115
N. A. Shulga, E. A. Romankevich, N. V. Vylegzhanina, E. A. Streltsova, V. Yu. Fedulov, A. V. Polyakova
Abstract
The sources of supply and transformation of organic matter (OM) as it transitions from dissolved form to particulate matter, fluffy layer, and bottom sediments were investigated along a meridional transect from the Lena River delta to the continental slope (in the depth range of 10 to 2390 meters, cruise 63 of the R/V Akademik Mstislav Keldysh, September 2015). The study of OM molecular markers showed that dissolved and particulate organic matter of marine and terrigenous origin biodegrades in the water column and accumulates insignificantly in bottom sediments. Thus, OM from Lena River runoff does not contribute to the formation of OM in bottom sediments in summer. An area of influence of under-ice blooms on the sedimentation process was identified on the outer shelf.
摘要 研究人员沿勒拿河三角洲至大陆坡的子午线横断面（深度范围为 10 米至 2390 米，2015 年 9 月 Akademik Mstislav Keldysh 号考察船的第 63 次航行）调查了有机物（OM）从溶解形式向颗粒物、蓬松层和底层沉积物过渡时的供应和转化来源。对 OM 分子标记的研究表明，海洋和陆源的溶解有机物和颗粒有机物会在水体中发生生物降解，在底层沉积物中的累积量很小。因此，勒拿河径流中的 OM 并未参与夏季底层沉积物中 OM 的形成。在外陆架上发现了一个冰下水花对沉积过程有影响的区域。
{"title":"Geochemical Markers of Organic Matter Transformation in the Eastern Laptev Sea","authors":"N. A. Shulga, E. A. Romankevich, N. V. Vylegzhanina, E. A. Streltsova, V. Yu. Fedulov, A. V. Polyakova","doi":"10.1134/s0001437024020115","DOIUrl":"https://doi.org/10.1134/s0001437024020115","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The sources of supply and transformation of organic matter (OM) as it transitions from dissolved form to particulate matter, fluffy layer, and bottom sediments were investigated along a meridional transect from the Lena River delta to the continental slope (in the depth range of 10 to 2390 meters, cruise 63 of the R/V <i>Akademik Mstislav Keldysh</i>, September 2015). The study of OM molecular markers showed that dissolved and particulate organic matter of marine and terrigenous origin biodegrades in the water column and accumulates insignificantly in bottom sediments. Thus, OM from Lena River runoff does not contribute to the formation of OM in bottom sediments in summer. An area of influence of under-ice blooms on the sedimentation process was identified on the outer shelf.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931002","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 : 2024-05-14DOI: 10.1134/s0001437024020139
A. A. Udalov, I. M. Anisimov, V. O. Muravya, A. V. Lesin, V. Yu. Kuzmin, A. K. Zalota, M. V. Chikina
Abstract
The first quantitative video survey of the benthic megafauna was carried out on a transect in the eastern part of the Kara Sea from the slope of the Voronin Trough to the upper shelf in the depth range from 1680 to 70 metres. The data were obtained using the TUV “Videomodule” during the 89th cruise of the R/V Akademik Mstislav Keldysh in autumn 2022. It was shown that the megabenthos in this area differs significantly from that of the western part of the sea and Blagopoluchiya Bay (Novaya Zemlya). In the eastern part of the Kara Sea, echinoderms dominated, among which ophiuroids were in the first place, whereas in the western part of the sea and the Blagopoluchiya Bay, the key component of the megafauna was the snow crab Chionoecetes opilio. Single adults of Ch. opilio were recorded for the first time at almost all stations in the eastern part of the sea, but, in contrast to the western area, the snow crab has not yet become dominant here and has not influenced the benthic communities.
{"title":"Differences in Megabenthos Communities in the Eastern and Western Parts of the Kara Sea Based on Video Observations","authors":"A. A. Udalov, I. M. Anisimov, V. O. Muravya, A. V. Lesin, V. Yu. Kuzmin, A. K. Zalota, M. V. Chikina","doi":"10.1134/s0001437024020139","DOIUrl":"https://doi.org/10.1134/s0001437024020139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The first quantitative video survey of the benthic megafauna was carried out on a transect in the eastern part of the Kara Sea from the slope of the Voronin Trough to the upper shelf in the depth range from 1680 to 70 metres. The data were obtained using the TUV “Videomodule” during the 89th cruise of the R/V <i>Akademik Mstislav Keldysh</i> in autumn 2022. It was shown that the megabenthos in this area differs significantly from that of the western part of the sea and Blagopoluchiya Bay (Novaya Zemlya). In the eastern part of the Kara Sea, echinoderms dominated, among which ophiuroids were in the first place, whereas in the western part of the sea and the Blagopoluchiya Bay, the key component of the megafauna was the snow crab <i>Chionoecetes opilio</i>. Single adults of <i>Ch. opilio</i> were recorded for the first time at almost all stations in the eastern part of the sea, but, in contrast to the western area, the snow crab has not yet become dominant here and has not influenced the benthic communities.</p>","PeriodicalId":54692,"journal":{"name":"Oceanology","volume":"129 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931020","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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