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Numerical Modeling of Tidal Phenomena of Penzhina Bay 笔架山湾潮汐现象的数值模拟

IF 1 4区地球科学 Q3 Earth and Planetary Sciences

Oceanology

Pub Date : 2024-01-08 DOI: 10.1134/s0001437023060140

D. R. Shpachuk, O. V. Sokolov, A. N. Bugaets

Abstract

In this study, the Delft3D-Flow hydrodynamic model was used to determine the characteristics of the main tidal waves and currents in Penzhina Bay (Sea of Okhotsk, Russia). The initial and boundary conditions are set according to the TPXO9 model data, and the salinity and water temperature for each model layer are set based on reanalysis data of the HYCOM ocean general circulation model, with a time step of 3 h. The European Center for Medium-Range Weather Forecasts (ECMWF) ERA-5 reanalysis was used as meteoforcing. Modeling was performed for the ice-free period from May to September 2005. Maps of cotidal lines, tidal ellipses, and reversibility coefficients for the main tidal waves were constructed: semidiurnal wave M2 and diurnal wave K1. The model was verified by comparing the published and calculated harmonic components for nine sea level monitoring points located in Penzhina Bay. Conformance evaluation generally shows a high degree of consistency between the model and reference data. The values of the determination coefficient R² between the series formed by the model and published harmonic components range from 0.96 to 0.99. According to the magnitude of relative errors, the modeling results are divided into two consistency categories: high (1.48–2.14%) and satisfactory (2.93–4.27%). Spatial distribution patterns for the values of relative errors were not found. A certain inconsistency in the results is presumably due to the time discretization of the observation time support and the short sea level monitoring data series used to calculate the published harmonic components for Penzhina Bay.

摘要本研究采用 Delft3D-Flow 流体动力模型确定了奔日那湾（俄罗斯鄂霍次克海）主要潮汐波和潮流的特征。初始条件和边界条件根据 TPXO9 模型数据设定，各模型层的盐度和水温根据 HYCOM 海洋总环流模型的再分析数据设定，时间步长为 3 小时。建模时间为 2005 年 5 月至 9 月的无冰期。绘制了潮汐线图、潮汐椭圆图和主要潮汐波的可逆系数图：半日波 M2 和昼波 K1。通过比较位于笔架山湾的九个海平面监测点的已公布谐波分量和计算谐波分量，对模型进行了验证。一致性评估结果表明，模型与参考数据之间具有很高的一致性。由模型形成的序列与公布的谐波分量之间的判定系数 R2 值在 0.96 至 0.99 之间。根据相对误差的大小，模型结果分为两个一致性类别：高（1.48-2.14%）和满意（2.93-4.27%）。没有发现相对误差值的空间分布规律。结果的不一致性可能是由于观测时间支持的时间离散化以及用于计算已公布的奔子栏海湾谐波分量的海平面监测数据序列较短所致。

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引用次数: 0

Organic Matter in the Ocean: Indicators of Biogeochemical Processes 海洋中的有机物质：生物地球化学过程的指标

IF 1 4区地球科学 Q3 Earth and Planetary Sciences

Oceanology

Pub Date : 2023-12-01 DOI: 10.1134/s0001437023070159

Abstract

The article presents informative organogeochemical indicators used in oceanology to characterize biogeochemical processes. A classification based on data on suspended particulate matter, plankton, benthos, bottom sediments, and sea, river, and pore water has been developed. Clusters have been identified that include the elemental and isotopic composition of organic matter (OM), the group composition of lipids, aliphatic and alicyclic hydrocarbons, higher alcohols, macromolecular acids and ketones, isoprenoids, lignin and its structural monomers, and PAHs. The most informative indices are considered, which make it possible to assess the genesis of the original OM, the degree of its transformation, sources, and the ratio of aquatic and terrigenous components. These indices reflect the influx of riverine and aeolian material and permafrost thawing and make it possible to reconstruct the temperature of river waters and coastal upwellings. They significantly complement biooceanological, lithological, and geochemical studies and expand the biogeochemical methodology for studying the carbon cycle.

摘要文章介绍了海洋学中用于描述生物地球化学过程的信息有机地球化学指标。根据悬浮颗粒物、浮游生物、底栖生物、底层沉积物以及海水、河水和孔隙水的数据，制定了一种分类方法。已确定的群组包括有机物（OM）的元素和同位素组成、脂质、脂肪族和脂环族碳氢化合物、高级醇、大分子酸和酮类、异丙烯酸、木质素及其结构单体和多环芳烃的群组组成。考虑到信息量最大的指数，可以评估原始 OM 的成因、转化程度、来源以及水生和陆生成分的比例。这些指数反映了河水和风化物的流入以及永久冻土的融化，并能重建河水和沿岸上升流的温度。它们极大地补充了生物海洋学、岩石学和地球化学研究，拓展了研究碳循环的生物地球化学方法。

引用次数: 0

Study of Abiotic Factors Controlling Marine Ecosystem Dynamics and Formation of Anomalous Conditions in Coastal Waters of the Far East in the 80th Cruise of the R/V Professor Gagarinskiy 在 "加加林斯基教授号 "考察船第 80 次航行中研究控制远东沿海水域海洋生态系统动态和异常情况形成的非生物因素

IF 1 4区地球科学 Q3 Earth and Planetary Sciences

Oceanology

Pub Date : 2023-12-01 DOI: 10.1134/s0001437023060085

Abstract

On cruise 80 of the R/V Professor Gagarinskiy from June 15 to July 18, 2022, integrated hydrographic and hydrochemical studies were carried out in Avachinskiy Bay of the Kamchatka Peninsula, on the northeastern shelf of Sakhalin Island, and in Peter the Great Bay to assess current environmental risks in the coastal zone of key areas of Russia’s Far Eastern seas and, in particular, to study possible abiotic factors that caused the mass mortality of marine organisms in Kamchatka in fall 2020. Comprehensive observations were performed, including CTD, hydrochemical water sampling, moorings, and plankton and bottom sediment sampling. An increased nutrient content was found, both in subsurface and intermediate Pacific waters, in comparison with 1990s–2000s data. Intensive snowmelt on adjacent mountain slopes during the survey period showed the significant impact of continental runoff on the hydrochemical characteristics of Avachinskiy Bay waters, causing decreased salinity and significantly increased concentrations of nutrients and chlorophyll a in the coastal zone. The dynamics of mesoscale eddies ensures transport of coastal waters to the ocean over a distance of more than 100 nautical miles. The results suggest that the catastrophic phenomenon off Kamchatka, associated with anomalous harmful algae blooms, is due to conjugate biogeochemical and hydrographic factors: river runoff and intrusion of deep waters on the shelf caused by coastal wind and dynamic upwelling during the period of maximum warming and eutrophication of subarctic Pacific waters, as well as the orographic and topographic features of Avachinskiy Bay.

摘要 2022 年 6 月 15 日至 7 月 18 日，"加加林斯基教授号 "考察船在堪察加半岛阿瓦钦斯基海湾、萨哈林岛东北大陆架和彼得大帝湾进行了综合水文和水化学研究，以评估俄罗斯远东海域关键区域沿海地区当前的环境风险，特别是研究造成 2020 年秋季堪察加半岛海洋生物大量死亡的可能非生物因素。进行了全面观测，包括 CTD、水化学取样、系泊以及浮游生物和底泥取样。与 20 世纪 90 年代至 2000 年代的数据相比，发现太平洋次表层和中层水域的营养物质含量有所增加。调查期间，邻近山坡上的大量融雪表明，大陆径流对阿瓦钦斯基湾水域的水化学特征产生了重大影响，导致沿岸地区盐度下降，营养物质和叶绿素 a 的浓度显著增加。中尺度漩涡的动力确保了沿岸水域向海洋的传输距离超过 100 海里。研究结果表明，堪察加半岛附近与异常有害藻类大量繁殖有关的灾难性现象是由生物地球化学和水文地理因素共同作用造成的：在亚北极太平洋水域变暖和富营养化最严重期间，沿岸风和动态上升流造成的河流径流和陆架深水入侵，以及阿瓦钦斯基海湾的地形和地貌特征。

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引用次数: 0

Bottom Relief and Magnetic Anomaly of the Ninetyeast Ridge Near 5° 九东海脊 5°附近的海底地形和磁异常

IF 1 4区地球科学 Q3 Earth and Planetary Sciences

Oceanology

Pub Date : 2023-12-01 DOI: 10.1134/s0001437023060073

Abstract

The geophysical survey on cruise 42 of the R/V Akademik Boris Petrov (2017) in the survey area near site 758 ODP significantly refined knowscarp about the bottom topography of the northern segment of the Ninetyeast Ridge. It is crossed by E–W transversal linear troughs, which are apparently young tectonic fractures. The morphology of the narrow elevated block in the central part of the deep depression between neighboring large volcanic edifices has been characterized in detail. In addition to linear tectonic structures, the main features of this block are two volcanic seamounts. A detailed magnetic survey in this area identified for the first time the nature of sources of magnetic anomalies on the Ninetyeast Ridge. Intense local magnetic anomalies have been observed here, both confined to local structures of the bottom and basement relief, and clearly unrelated to them. These anomalies have a complex interfering nature caused by the superposition of fields from sources separated by magnetization, spatial position, and age. According to the results of paleomagnetic analysis of the anomalies, the age of the structures here is very wide: the youngest features formed about 20 Ma ago, and the oldest, over 80 Ma ago.

摘要 Akademik Boris Petrov 号考察船第 42 航次（2017 年）在 758 ODP 号站点附近的勘测区进行的地球物理勘测极大地完善了对九曲东海脊北段底部地形的认识。它被东西向的横向线槽穿过，这些线槽显然是年轻的构造断裂。在相邻大型火山建筑物之间的深凹陷中央部分的狭窄隆起地块的形态特征已得到详细描述。除线性构造结构外，该区块的主要特征是两个火山海山。在这一地区进行的详细磁力勘测首次确定了九曲海脊磁异常源的性质。在这里观察到了强烈的局部磁异常现象，既有局限于海底和基底地形的局部结构，也有明显与之无关的异常现象。这些异常现象具有复杂的干扰性质，是由磁化、空间位置和年代不同的磁场源叠加造成的。根据对异常现象的古地磁分析结果，这里的结构年代非常宽泛：最年轻的特征形成于大约 20 Ma 之前，而最古老的则形成于 80 Ma 之前。

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引用次数: 0

Aspects of the Towed Underwater Vehicle “Videomodule”: Utilization for Surveying Underwater Objects and Benthic Fauna 拖曳式水下航行器“视频模块”的各个方面:用于测量水下物体和底栖动物