Journal of Marine Systems最新文献_第8页

The influence of wave-current interaction on sea ice modelling of the Bohai Sea 波流相互作用对渤海海冰模拟的影响

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-29 DOI: 10.1016/j.jmarsys.2025.104090

Sheng Wang , Xueen Chen , Peng Zheng , Bin Jia

A sea ice model considering wave-current interaction (WCI) was constructed on the basis of the FVCOM, CICE, and Un-SWAN models for the Bohai Sea. The influence of WCI on sea ice formation and melting in the Bohai Sea during the winter of 2015/2016 was investigated. The results show that the WCI mainly affect the concentration and thickness of sea ice in the Bohai Sea. During the ice melting period, the WCI significantly increased the surface water velocity and sea ice melting rate of the Bohai Sea. The mechanism by which WCI affect the ice melting process is as follows: The non–conservative force(F^w) induced by WCI changes the amplitude and direction of the water velocity. During the ice melting period, the direction of F^w is nearly the same as the direction of the sea surface current in the marginal ice zone of Liaodong Bay, which consequently enhances the surface water current as well as its drag force on the sea ice, such processes accelerate sea ice advection and sea ice melting, and the white-capping breaking term plays a dominant role in the F^w. In the sea ice-covered areas, the presence of sea ice affects the propagation of waves, resulting in different degrees of wave height reduction. When the sea ice concentration is lower, the influence of sea ice on the structure and velocity of the current is more significant. From a thermodynamic perspective, when WCI are considered, the mixed layer depth (MLD) can increase by up to 15 m during the growth period, and the HC of the mixed layer can increase by up to 5000 GJ/m².

在FVCOM、CICE和Un-SWAN模型的基础上，建立了考虑波流相互作用的渤海海冰模型。研究了2015/2016年冬季WCI对渤海海冰形成和融化的影响。结果表明，WCI主要影响渤海海冰的浓度和厚度。在融冰期，WCI显著提高了渤海的地表水流速和海冰融化速率。WCI影响冰融过程的机理是：WCI诱导的非保守力（Fw）改变了水流速的幅度和方向。在融冰期，Fw的方向与辽东湾边缘冰带的海流方向基本一致，从而增强了表层水流及其对海冰的阻力，加速了海冰平流和海冰融化，白盖断裂项在Fw中起主导作用。在海冰覆盖地区，海冰的存在影响了波浪的传播，导致不同程度的波高降低。当海冰浓度较低时，海冰对洋流结构和流速的影响更为显著。从热力学角度来看，当考虑WCI时，混合层深度（MLD）在生长期间可增加15 m，混合层的HC可增加5000 GJ/m2。

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引用次数: 0

Dynamics of the Iokanga River plume according to SAR and optical satellite data 根据SAR和光学卫星资料的Iokanga河羽流动力学

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-26 DOI: 10.1016/j.jmarsys.2025.104093

Aleksandr Konik , Alexander Osadchiev

The Iokanga River is one of the largest rivers of the Kola Peninsula, discharging into the southwestern part of the Barents Sea and the northern part of the White Sea. The outflows from the Iokanga River and other regional rivers form a freshened coastal water mass, which extends eastward as the Coastal Murmansk Current. However, the dynamics and variability of small river plumes, which represent a transitional form between river discharge and the coastal water mass, remain practically unexplored in this region. In this study, based on high-resolution synthetic aperture radar (SAR) and optical images, the spatial characteristics of the Iokanga plume were examined and its dynamics were analyzed during the ice-free period. The study provides an assessment of external hydrometeorological factors and their contribution to the variability of the plume positions on various time scales. Notably, a key contribution of tidal currents to the formation of the intra-daily variability of the plume was established, which is nontypical for the majority of river plumes in the Arctic Ocean. The current work also describes the main characteristics of submesoscale eddies in the Iokanga plume and analyzes the mechanisms of their formation. The obtained results are crucial for understanding the process of coastal water mass formation in the southwestern Barents Sea and for identifying potential pathways for river-borne contaminant spread. From a methodological perspective, this work may be valuable for studying the characteristics of small river plumes using SAR and optical satellite data in coastal regions, which are poorly covered by in situ measurements.

Iokanga河是科拉半岛最大的河流之一，流入巴伦支海的西南部和白海的北部。从Iokanga河和其他地区河流流出的水形成了一个新鲜的沿海水团，向东延伸成为沿海摩尔曼斯克流。然而，作为河流流量和海岸水团之间过渡形式的小河流羽流的动力学和变异性在该地区仍未得到充分的研究。基于高分辨率合成孔径雷达（SAR）和光学图像，研究了Iokanga羽流在无冰期的空间特征，并对其动力学进行了分析。该研究提供了外部水文气象因子及其在不同时间尺度上对羽流位置变化的贡献的评估。值得注意的是，建立了潮流对羽流日内变化形成的关键贡献，这对于北冰洋大多数河流羽流来说是不典型的。目前的工作还描述了Iokanga羽流的亚中尺度涡旋的主要特征，并分析了其形成机制。所获得的结果对于理解巴伦支海西南部沿海水团形成的过程以及确定河流传播污染物的潜在途径至关重要。从方法学的角度来看，这项工作可能对利用SAR和光学卫星数据在沿海地区研究小河流羽流的特征有价值，这些地区很少被现场测量覆盖。

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引用次数: 0

Seasonal and spatial variability and mechanisms of suspended sediment concentration in the Yellow River mouth and adjacent waters 黄河口及邻近水域悬沙浓度的季节和空间变化及其机制

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-26 DOI: 10.1016/j.jmarsys.2025.104092

Mengyuan Tao , Tao Wang , Zhixing Chen , Gaibo Zhao , Chenzhuo Song , Changwei Bian , Wensheng Jiang

Suspended sediment concentration (SSC) plays a critical role in the ecological and geomorphological dynamics of coastal environments, particularly in river mouths where sediment fluxes are substantial. This study focuses on the Yellow River (YR) mouth and its adjacent waters, which is one of the coastal areas with the highest SSC in the world. Although some efforts have been made to understand the seasonal and spatial variability and mechanisms of SSC in this region, gaps remain, particularly in understanding the spatial disparity in high SSC distributions and its dynamic mechanisms. To address these gaps, observations based on four research cruises and numerical model simulations based on the Regional Oceanic Modeling System (ROMS) are conducted to study the variability and mechanisms of SSC. The findings reveal that SSC in the YR mouth and adjacent waters exhibits significant seasonal variability, with higher concentrations during winter due to stronger wind-induced resuspension. Two key hot-spots are identified: the YR mouth and the southern Bohai Strait. The high SSC is attributed to horizontal transport of riverine input and resuspension of bottom sediments in the YR mouth, and is mainly induced by bottom resuspension in the southern Bohai Strait. Additionally, tidal velocity is identified as a primary driver of SSC variations throughout the tidal cycle, with tidal phases of the observation time significantly influencing observed SSC and introducing uncertainty in spatial distribution analyses based on cruise observations. The current- and wave- induced bottom shear stresses (BSSs) both play primary roles in sediment resuspension, while the wave-induced BSS dominates the seasonal variability of SSC. The results are expected to contribute to advancing the understanding of sediment dynamics in river mouth and its adjacent waters.

悬沙浓度（SSC）在沿海环境的生态和地貌动力学中起着至关重要的作用，特别是在泥沙通量较大的河口。本研究以黄河河口及其邻近海域为研究对象，该海域是世界上SSC最高的沿海地区之一。虽然对该地区南盐含量的季节和空间变化及其机制已经有了一定的了解，但在了解南盐含量高分布的空间差异及其动力机制方面仍然存在空白。为了弥补这些空白，利用4个研究巡航的观测和基于区域海洋模拟系统（ROMS）的数值模式模拟来研究SSC的变率及其机制。研究结果表明，YR口和邻近水域的SSC具有显著的季节变化，冬季由于风引起的再悬浮更强，SSC浓度更高。确定了两个关键热点：YR口和渤海海峡南部。高SSC是由河流输入的水平输送和YR河口底部沉积物的再悬浮引起的，主要是由渤海海峡南部的底部再悬浮引起的。此外，潮汐速度被认为是整个潮汐周期中SSC变化的主要驱动因素，观测时间的潮汐阶段显著影响观测到的SSC，并在基于巡航观测的空间分布分析中引入不确定性。在沉积物再悬浮过程中，海流和波浪引起的底部切应力（BSSs）都起主要作用，而波浪引起的底部切应力（BSSs）在SSC的季节变化中起主导作用。研究结果将有助于进一步认识河口及其邻近水域的泥沙动力学。

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引用次数: 0

Progress in nutrient dynamics of green tide in the Yellow Sea of China 中国黄海绿潮营养动态研究进展

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-26 DOI: 10.1016/j.jmarsys.2025.104091

Tingting Wu , Jingyi Sun , Hongtao Liu , Fangling Bi , Jianheng Zhang , Peimin He

The green tide outbreak of Ulva prolifera (U. prolifera) in the Yellow Sea of China is one of the most significant green tide disasters worldwide. The abundant nutrients in the Yellow Sea provide the essential material basis for these outbreaks, as U. prolifera rapidly absorbs and stores these nutrients. Recent studies have identified genes in the U. prolifera genome that encode inorganic nitrogen transport proteins, and the nitrogen metabolism pathway of U. prolifera has been elucidated. This paper reviews the sources of nutrients in the Yellow Sea, analyzes their impact on the physiology of U. prolifera, and explores their influence on U. prolifera gene expression. Additionally, the study utilizes CiteSpace software to summarize research hotspots and trends related to nutrient. Based on these insights, the paper offers suggestions and prospects for future research directions, aiming to contribute new ideas for predicting, preventing, and controlling green tide outbreaks.

中国黄海增生Ulva prolifera （U. prolifera）绿潮爆发是全球最严重的绿潮灾害之一。黄海丰富的营养物质为这些疾病的爆发提供了必要的物质基础，因为增生乌菌能迅速吸收和储存这些营养物质。近年来的研究已经在增殖藻基因组中发现了编码无机氮转运蛋白的基因，并初步阐明了增殖藻的氮代谢途径。本文综述了黄海营养物质的来源，分析了营养物质对增殖藻生理的影响，并探讨了营养物质对增殖藻基因表达的影响。此外，本研究利用CiteSpace软件对营养相关的研究热点和趋势进行了总结。在此基础上，对未来的研究方向提出了建议和展望，旨在为绿潮暴发的预测、预防和控制提供新的思路。

引用次数: 0

Growth potential of Ulva prolifera in the South Yellow Sea and effectiveness of countermeasures 南黄海藻的生长潜力及对策效果

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-26 DOI: 10.1016/j.jmarsys.2025.104094

Changyou Wang , Yuxing Tang , Yiwen Xu , Jie Xiao , Shiliang Fan , Yu Zang , Zongling Wang , Rongguo Su

The effectiveness of green tide countermeasures was assessed using a model of Ulva prolifera growth factors and drift patterns in the South Yellow Sea. The reliability of the model was confirmed using satellite data showing the green tides in 2018, 2019, and 2021. The point of zero growth (biological zero) was determined to be 5.2 °C. The highest growth potential occurred successively in the sea area near 33.0°N and 123.5°E, Subei Shoal, and the north of Subei Shoal, from April to June, in the same chronological order with ascending order of surface sea temperature. Differences in growth potential were attributed to differences in dissolved inorganic nitrogen. Among the different countermeasures assessed, salvaging floating U. prolifera in open waters and early recycling of Neopyropia rafts were found to be the most effective in reducing the biomass of U. prolifera and the extent of green tides. In comparison, chemical treatment contributed only minimally to the reduction in U. prolifera biomass.

利用南黄海增生藻生长因子和漂变模式模型，对绿潮对策的有效性进行了评价。使用显示2018年、2019年和2021年绿潮的卫星数据证实了该模型的可靠性。确定零生长点（生物零度）为5.2°C。4 ~ 6月生长势最大的海域依次为33.0°N和123.5°E附近海域、苏北浅滩和苏北浅滩以北海域，与海面温度的上升顺序相同。生长势的差异归因于溶解无机氮的差异。在不同的对策中，在开阔水域打捞漂浮藻和早期回收利用Neopyropia木筏对减少藻生物量和绿潮范围最有效。相比之下，化学处理对褐藻生物量的减少贡献很小。

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引用次数: 0

Mesoscale assemblages of fish and megainvertebrates as evidence of benthiscapes on continental shelves 鱼类和大型脊椎动物的中尺度组合是大陆架上底栖动物的证据

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-25 DOI: 10.1016/j.jmarsys.2025.104088

Thomas Outrequin , Hervé Le Bris , Jacques Grall , Pascal Laffargue

Despite the relatively small proportion of ocean surface they represent, continental shelf ecosystems are among the most productive in the world. Located at the interface between terrestrial and marine environments, these habitats are structured by strong environmental forcings, especially on the sea bottom. A clear understanding of the spatial distribution of these habitats, along with knowledge on the composition and functioning of their associated communities, is essential for fisheries management and ecosystem conservation. Here, we used data from yearly EVHOE otter trawl surveys (2008–2020) to characterize the spatial structuration of benthic communities of the entire continental shelf of the Bay of Biscay (France), and to investigate the potential environmental drivers of these patterns. Two separate biological components were studied: epibenthic megainvertebrates and bentho-demersal fish. Clustering analyses identified seven assemblages from species composition of stations. Each assemblage was denominated according to its geographical location. We detected a strong correlation between the spatial organization of the different assemblages identified for fish and megainvertebrates, providing evidence for broad-scale spatial structuration of benthic habitats—benthiscapes—in this shelf ecosystem. The most influential environmental variables were identified as bottom temperature, sediment type, and primary production. Patterns in certain structural parameters, such as biomass, revealed possible spatial differences in ecological functioning. For example, we observed a drop in biomass from the coast to the central part of the shelf, followed by an increase in biomass near the edge of the Armorican shelf. These patterns reflect major large-scale processes (river inputs versus shelf-break upwelling) structuring the entire Bay of Biscay ecosystem. A comparative analysis revealed that the biological features and functioning observed in this study are shared with other European continental shelves. In addition to improving our knowledge of benthic environments, studies such as this one can promote improvements in ecosystem-based management and marine spatial planning of a fast-changing ecosystem under multiple anthropogenic stresses.

尽管它们所代表的海洋表面比例相对较小，但大陆架生态系统是世界上最具生产力的生态系统之一。这些栖息地位于陆地和海洋环境的交界面，受到强烈的环境强迫，特别是海底环境强迫的影响。清楚地了解这些生境的空间分布，以及有关其相关群落的组成和功能的知识，对渔业管理和生态系统保护至关重要。在这里，我们使用了EVHOE年度水獭拖网调查（2008-2020）的数据来表征比斯开湾（法国）整个大陆架底栖生物群落的空间结构，并调查了这些模式的潜在环境驱动因素。研究了两种不同的生物成分：底栖大型脊椎动物和底栖鱼类。聚类分析从各站点的物种组成中鉴定出7个组合。每个组合都是根据其地理位置来命名的。我们发现了鱼类和大型脊椎动物不同组合的空间组织之间存在很强的相关性，为该陆架生态系统中底栖动物栖息地（底栖角）的大尺度空间结构提供了证据。影响最大的环境变量是底部温度、沉积物类型和初级生产。某些结构参数（如生物量）的格局揭示了生态功能可能的空间差异。例如，我们观察到从海岸到大陆架中心部分的生物量下降，随后在美洲大陆架边缘附近的生物量增加。这些模式反映了构成整个比斯开湾生态系统的主要大规模过程（河流输入与陆架断裂上升流）。比较分析表明，本研究所观察到的生物学特征和功能与其他欧洲大陆架相同。除了提高我们对底栖环境的认识外，这样的研究还可以促进在多种人为压力下快速变化的生态系统中基于生态系统的管理和海洋空间规划的改进。

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引用次数: 0

Distribution and abundance of fish larvae in the Patagonian Shelf-break Front 巴塔哥尼亚冰架断裂锋鱼类幼鱼的分布和丰度

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-25 DOI: 10.1016/j.jmarsys.2025.104087

Martín D. Ehrlich , Eduardo M. Acha , Paola Betti , Marina Do Souto , Mariana Cadaveira , Laura Machinandiarena

The distribution and abundance of fish larvae were investigated in three sections across the Patagonian Shelf-break Front, in the Southwest Atlantic, between 44° and 47° S during springtime. Hydrographic sampling covered the shelf edge, slope and oceanic waters down to 3160 m depth. Larvae were collected with a Hydro-Bios Multi-net of 0.25 m² mouth size at 48 stations. Sampling covered the outer shelf, slope and oceanic waters. Each station was sampled during day and night at five depth levels from the surface to 200 m. At each station, temperature, salinity and fluorescence profiles were obtained to characterize water masses and detect the front. The variation in salinity between shelf and Malvinas Current waters was the most obvious sign of the frontal area. Twenty-two different species belonging to 10 orders and 16 families were found. On the outer shelf, were detected larvae of Perciformes and Scorpaeniformes, in low relative abundances. The slope was characterized by the presence of larvae of Myctophiformes and Gadiformes, while in the open ocean area, larvae of mesopelagic fishes such as Myctophiformes, Argentiniformes and Stomiiformes predominated. The highest abundance of larvae was found at the levels closest to the surface in the night stations. This study is the first one to obtain information on the ichthyoplankton composition of the Patagonian Shelf-break Front ecosystem for the austral spring period.

研究了西南大西洋44°~ 47°S之间的巴塔哥尼亚断裂带锋3个断面春季鱼类幼虫的分布和丰度。水文采样覆盖了陆架边缘、斜坡和深达3160米的海洋水域。采用0.25 m2口型的Hydro-Bios Multi-net在48个站点采集幼虫。采样范围包括外大陆架、斜坡和海水。每个站点在白天和夜间从地表到200米的五个深度进行采样。在每个站点，获得温度、盐度和荧光剖面，以表征水团并检测锋面。陆架和马尔维纳斯洋流之间盐度的变化是锋面区最明显的标志。共发现16科10目22种。外大陆架上检出有表现目和Scorpaeniformes幼虫，相对丰度较低。坡面以霉形目和加底形目的幼虫为主，而开阔海域以霉形目、阿根廷形目和气孔形目等中远洋鱼类的幼虫为主。夜间站点中最接近地表的水平面幼虫丰度最高。本研究首次获得了南部春季巴塔哥尼亚冰架断裂锋生态系统的浮游鱼类组成信息。

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引用次数: 0

Dissolved organic matter (DOM) and barium in James Bay: Distribution, sources, and climate change implications 詹姆斯湾溶解有机物（DOM）和钡：分布、来源和气候变化影响

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-17 DOI: 10.1016/j.jmarsys.2025.104084

Justin Forget , Zou Zou Kuzyk , C.J. Mundy , Céline Guéguen

The properties of dissolved organic matter (DOM) were examined in a dataset representative of the James Bay (Canada) marine system following two summer expeditions in 2021 and 2022. The absorption coefficients at 275 nm (a₂₇₅) and 295 nm (a₂₉₅) of the chromophoric DOM (CDOM) were used to establish a region-specific, usable in-depth, predictive model of dissolved organic carbon (DOC) concentration in summer, with a mean absolute percentage error of only 11 %, comparable to other models in polar environments. The DOC concentration, a₃₅₀, the spectral slope between 275 and 295 nm (S₂₇₅_–₂₉₅), the dissolved barium concentration, and four PARAFAC components (three humic-like and one protein-like) were employed as freshwater tracers. At the surface, we observed a very low DOM region in the north-west of the bay associated with the inflow of marine waters from Hudson Bay, a highly DOM-rich region in the south and east in James Bay caused by strong riverine inputs and, in the north-east, a very fresh region, but with lower DOM concentrations than to the south, induced by the discharge of the La Grande River. At depth, a homogeneous, low DOM distribution is observed in the north of James Bay, extending from east to west. In contrast, the deep water to the south is much richer in DOM and appears to circulate along the east coast. The lack of exchange at depth between the northern and southern regions is attributed to the presence of a sill that creates a physical barrier. The analysis of lignin-phenols in surface samples revealed a more “woody gymnosperm” vegetation compared to the Hudson Bay Rivers further north, which is in line with the known vegetation surrounding the Bay. The portrait of the DOM in offshore James Bay in summer thus provides a benchmark for studying the evolution of the carbon pool under climate change in this region, which is likely to undergo significant upheaval due to permafrost thaw, increased riverine inputs, and alteration of the vegetal ecosystem.

在2021年和2022年两次夏季考察之后，在具有代表性的詹姆斯湾（加拿大）海洋系统数据集中研究了溶解有机物（DOM）的特性。利用CDOM在275 nm （a275）和295 nm （a295）处的吸收系数，建立了具有区域特异性的夏季溶解有机碳（DOC）浓度深度预测模型，平均绝对百分比误差仅为11%，与极地环境下的其他模型相当。采用DOC浓度、a350、光谱斜率275 ~ 295 nm （s275 ~ 295）、溶解钡浓度和4种PARAFAC组分（3种腐殖质样和1种蛋白样）作为淡水示踪剂。在海面上，我们观察到海湾西北部的DOM非常低，这与哈德逊湾海水的流入有关；詹姆斯湾南部和东部的DOM非常丰富，这是由强烈的河流输入造成的；在东北部，一个非常新鲜的地区，但DOM浓度低于南部，这是由拉格兰德河的排放引起的。在深度上，James Bay北部呈现自东向西的均匀低DOM分布。相比之下，南部的深水区DOM含量要丰富得多，并且似乎沿着东海岸循环。北部和南部地区之间缺乏深层交流的原因是存在一个造成物理障碍的屏障。对表面样品中木质素酚的分析显示，与更北的哈德逊湾河流相比，这里有更多的“木本裸子植物”植被，这与海湾周围已知的植被一致。因此，夏季詹姆斯湾近海DOM的图像为研究该地区在气候变化下碳库的演变提供了一个基准，该地区可能因多年冻土融化、河流输入增加和植被生态系统的改变而发生重大剧变。

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引用次数: 0

Subtidal variability of near-surface salinity in the Cochin estuary, southwest coast of India: Insights from year-long continuous observation 印度西南海岸科钦河口近地表盐度的潮下变化：来自一年连续观测的见解

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-16 DOI: 10.1016/j.jmarsys.2025.104086

I.P. Safin , V. Vijith , R. Sajeev , N. Anup , S. Vasudevan , N.M.I. Shehsin , P.K. Saji , K.A. Anoop , K. Shameem , N.T. Manoj

A significant knowledge gap exists about the subtidal variations in salinity in Indian monsoonal estuaries due to a lack of continuous data. To address this, we collected high-resolution, long-term near-surface measurements from the Cochin estuary in southwestern India. A wavelet spectral analysis of this data reveals notable subtidal variability in the estuary, with periods ranging from 10 to 90 days. This indicates the presence of intraseasonal oscillations throughout the year, from December 2019 to May 2021. During the wet monsoon season (June–September), subtidal variations in near-surface salinity show amplitudes typically oscillating between 5 and 10 with an average salinity of 6.5, occasionally matching the dominant tidal amplitudes. In the dry season (December to April), the average surface salinity is around 30, and the subtidal oscillation amplitude typically ranges from 3 to 5. We compared the observed subtidal salinity variability with other environmental data, such as rainfall, residual sea-level variability near the estuary's mouth, and water-level variability upstream in the riverine channels. This comparison is used to speculate on the processes controlling the observed subtidal variability. We explored two possible processes that could cause subtidal salinity variability. The first process is the influence of 30–60 day oscillations associated with Monsoon Intraseasonal Oscillations (MISO). MISO involves the northward movement of cloud bands from the equatorial Indian Ocean towards the Himalayan foothills. We present evidence suggesting that coherent oscillations exist in the estuary within the MISO band. The second process relates to the influence of shelf wave propagation along the coast. During the dry season, we observed coherent oscillations in both surface salinity and sea level within a quasi-biweekly (10–20 days) period. The presence of shelf wave propagation along the coast during this season may explain the quasi-biweekly subtidal salinity variations in the estuary. Our findings have broader implications for understanding subtidal estuarine dynamics in monsoonal regimes of the Indian Ocean and other similar regions.

由于缺乏连续的数据，对印度季风河口的潮下盐度变化存在很大的认识差距。为了解决这个问题，我们从印度西南部的科钦河口收集了高分辨率的长期近地表测量数据。对这些数据的小波谱分析显示，河口的潮下变化显著，周期从10天到90天不等。这表明，从2019年12月到2021年5月，全年都存在季节性波动。在湿季风季节（6 - 9月），近地表盐度的潮下变化幅度通常在5 - 10之间振荡，平均盐度为6.5，偶尔与主导潮汐振幅相匹配。在旱季（12月至4月），平均海面盐度在30左右，潮下振荡幅值一般在3 ~ 5之间。我们将观测到的潮下盐度变化与其他环境数据（如降雨、河口附近的剩余海平面变化以及河道上游的水位变化）进行了比较。这种比较被用来推测控制观测到的潮下变化的过程。我们探索了两种可能导致潮下盐度变化的过程。第一个过程是与季风季内振荡（MISO）相关的30-60天振荡的影响。MISO涉及云带从赤道印度洋向喜马拉雅山麓向北移动。我们提出的证据表明，在MISO波段内，河口存在相干振荡。第二个过程涉及大陆架波沿海岸传播的影响。在旱季，我们观察到地表盐度和海平面在准两周（10-20天）的周期内发生相干振荡。在这个季节，沿海岸的陆架波传播的存在可以解释河口潮下盐度的准两周变化。我们的发现对于理解印度洋和其他类似地区季风状态下的潮下河口动力学具有更广泛的意义。

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引用次数: 0

Seasonal and mesoscale-eddy-caused variability in the Kuroshio surface current northeast of Taiwan differentiated using nine years of ocean radar observations 利用9年的海洋雷达观测，对台湾东北部黑潮表面流的季节和中尺度涡引起的变率进行了区分

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-06-11 DOI: 10.1016/j.jmarsys.2025.104085

M. Kashima , K. Ichikawa , A. Morimoto , J.J.-M. Hirschi

Seasonality and mesoscale eddies are the major sources of variability in the Kuroshio current northeast of Taiwan. Although previous studies have acknowledged these sources, none has differentiated their respective contributions. The surface current northeast of Taiwan was observed during 2001–2010 by a high-resolution spatiotemporal ocean radar system deployed on Ishigaki and Yonaguni Islands. We used the data from this system to differentiate between the contributions of the two sources of variability by comparing Kuroshio speed and path during different combinations of the phases of the two sources of variability: seasonality (summer or winter) and eddy type (anticyclonic or cyclonic). We found that the two sources of variability are independent. The period-averaged surface current structures for each combination of phases revealed two typical states for the Kuroshio. One is the “straight, fast” Kuroshio Current, which occurs when anticyclonic eddies arrive in summer (anticyclonic-summer phase) and the other is the appearance of the Kuroshio Branch Current, which happens when cyclonic eddies arrive in winter (cyclonic-winter phase). These typical Kuroshio surface current structures, revealed by classifying the phases of the sources of variability and conditions for their occurrence, should advance our understanding of the Kuroshio and its influences on the surrounding regions.

季节性和中尺度涡旋是台湾东北黑潮变率的主要来源。虽然以前的研究已经承认了这些来源，但没有一个研究区分它们各自的贡献。利用部署在石垣岛和与那国岛的高分辨率海洋雷达系统，对2001-2010年台湾东北海面流进行了观测。我们使用该系统的数据，通过比较黑潮速度和路径在两种变率来源的不同阶段组合中的贡献来区分两种变率来源：季节性（夏季或冬季）和涡旋型（反气旋或气旋）。我们发现变异的两个来源是独立的。每个相组合的周期平均表面电流结构揭示了黑潮的两种典型状态。一个是“直、快”的黑潮，它发生在夏季反气旋涡旋到达时（反气旋-夏季相），另一个是黑潮支流的出现，它发生在冬季气旋涡旋到达时（气旋-冬季相）。这些典型的黑潮表面流结构，通过对变率来源的阶段和发生条件的分类，将有助于我们对黑潮及其对周边地区的影响的认识。

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