Estuarine Coastal and Shelf Science最新文献_第10页

Invasive species management: The role of recreational fishing in managing Callinectes sapidus in the Balearic Islands, Spain 入侵物种管理：休闲捕鱼在西班牙巴利阿里群岛管理糙皮虫中的作用

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-10 DOI: 10.1016/j.ecss.2025.109610

Esperança Perelló , Joan Terrassa , Antoni Sureda , Samuel Pinya , Montserrat Compa

The following study evaluates a pilot recreational fishing program implemented in Mallorca (Balearic Islands, Spain) to manage the invasive Atlantic blue crab (Callinectes sapidus) in coastal ecosystems. Between 2020 and 2024, recreational fishers were authorised to harvest blue crabs in eleven selected coastal zones. In this study, we present a detailed analysis of the self-reported data from those fishers, which revealed strong spatial and temporal variability in catch, with an increase in total captures and catch efficiency over time. Some zones consistently yielded high returns, while others showed persistently low or null catches. Moreover, the statistical analysis confirmed that both the number of fishers and zone selection significantly influenced capture outcomes. Overall, the pilot program demonstrates that recreational control can engage citizens and achieve measurable removals, especially in high-yield areas, with over 15,000 captures during the five-year period. Despite the high number of captures, the self-reported nature of the data and the limitation of parallel ecological sampling data prevent the estimation of the net demographic impact; to assess it, future cycles should integrate independent, zone-specific abundance surveys. Lessons learned from this experience may be used to inform future participatory strategies for managing invasive species in coastal ecosystems, especially in the case of the Atlantic blue crab in the Mediterranean Sea.

下面的研究评估了在马略卡岛（西班牙巴利阿里群岛）实施的一项试点休闲钓鱼计划，该计划旨在管理沿海生态系统中入侵的大西洋蓝蟹（Callinectes sapidus）。在2020年至2024年期间，休闲渔民被授权在11个选定的沿海地区捕捞蓝蟹。在这项研究中，我们对这些渔民自我报告的数据进行了详细的分析，结果表明，随着时间的推移，总捕获量和捕捞效率都在增加，捕获量在时空上具有很强的变异性。有些地区的渔获量一直很高，而另一些地区的渔获量一直很低，甚至为零。此外，统计分析证实，渔民数量和区域选择对捕获结果有显著影响。总体而言，该试点项目表明，休闲控制可以吸引市民参与，并实现可衡量的清除，特别是在高产地区，在五年内捕获了15,000多只。尽管捕获的数量很多，但数据的自我报告性质和平行生态抽样数据的局限性阻碍了对人口净影响的估计；为了评估它，未来的周期应该整合独立的、特定区域的丰度调查。从这一经验中吸取的教训可用于为未来管理沿海生态系统中入侵物种的参与性战略提供信息，特别是在地中海的大西洋蓝蟹的情况下。

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引用次数: 0

Factors constraining the morphodynamics of tidal meanders in non-vegetated tidal flats under a monsoon climate 季风气候下无植被潮滩潮曲形态动力学的制约因素

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-12 DOI: 10.1016/j.ecss.2025.109606

Hoi-Soo Jung , Keunyong Kim , Junho Lee , Joo-hyung Ryu , Hanjun Woo

Tidal meanders, comprising large-scale channels, medium-sized creeks, and small-sized gullies, serve as critical lifelines supporting tidal flat ecosystems. While extensive research has been conducted on vegetated meanders in terrestrial and coastal environments, the morphodynamics of tidal meanders in non-vegetated tidal flats, particularly those influenced by monsoonal climates, remain poorly explored. This study investigates the migration dynamics of tidal meanders across three distinct non-vegetated tidal flats along the west coast of Korea, each differing in tidal range, embayment geometry, and surrounding topography. Based on over a decade of Google Earth imagery, migration rates were analyzed according to meander size. The results reveal that smaller meanders exhibit faster migration rates when normalized by channel width. Furthermore, the migration rates of tidal meanders in non-vegetated flats were found to be approximately an order of magnitude higher than those reported in the literature for vegetated environments such as salt marshes. The results also highlight significant differences in migration rates among the analyzed tidal flats, driven primarily by variations in tidal range and exposure to the northwesterly East Asian Winter Monsoon. These findings highlight the complex interactions between hydrodynamic, climatic and geomorphological factors in the dynamic evolution of tidal flat meanders.

潮汐曲流是支撑潮滩生态系统的重要生命线，由大型河道、中型小溪和小型沟渠组成。虽然对陆地和沿海环境中有植被的曲流进行了广泛的研究，但对无植被的潮滩中潮汐曲流的形态动力学，特别是受季风气候影响的潮汐曲流的研究仍然很少。本研究调查了沿韩国西海岸三个不同的无植被潮滩的潮汐曲流的迁移动力学，每个潮滩在潮差，海湾几何形状和周围地形上都有所不同。根据十多年来的b谷歌地球图像，根据曲流大小分析了迁移率。结果表明，当按河道宽度归一化时，较小的曲流表现出更快的迁移速率。此外，发现无植被滩地潮汐曲流的迁移速率比文献中报道的盐沼等植被环境的迁移速率大约高一个数量级。研究结果还强调了所分析的潮滩之间迁移率的显著差异，这主要是由潮差的变化和暴露于东亚西北冬季季风的影响所致。这些发现强调了水动力、气候和地貌因素在潮滩曲流动态演变中的复杂相互作用。

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引用次数: 0

Evaluating bio-carbon sequestration in Beibu Gulf marine ranching areas via EwE modelling and LMDI analysis 基于EwE模型和LMDI分析的北部湾海洋牧区生物碳固存评价

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-20 DOI: 10.1016/j.ecss.2025.109625

Wei Guo , Jie Feng , Haiyan Wang , Zhen Zhang , Shuang Liang , Tao Zhang , Haolin Yu

Marine ranching, which are artificially constructed nearshore ecosystems, increase carbon sequestration efficiency through bioremediation techniques such as stock enhancement and artificial reef deployment. Marine ranching enhances carbon sequestration but lacks robust evaluation methods. This article first develops a transferable framework for evaluating carbon sequestration in marine ranching by integrating ecosystem carbon budgets, dynamic carbon cycling, and the effects of species enhancement and fisheries management, and then applies this framework to the Beibu Gulf to demonstrate its generalisability and to identify the primary drivers. Based on field survey data, were developed Ecopath carbon mass models for a marine ranching and a nearby control area and fitted Ecosim models to simulate 12 stock enhancement-fishing scenarios combined with logarithmic mean Divisia index (LMDI) analysis. The results revealed that current artificial reef deployment increased the carbon flux and total carbon sequestration in the marine ranching area by 2.52 and 3.43 times compared with those in the control area, respectively. The “Mytilus + fishing” scenario (releasing Mytilus while maintaining current fishing) was simulated to achieve a high peak carbon sequestration efficiency of 2.21 times that of the baseline scenario. LMDI analysis revealed that expansion of the biomass scale compared to the community structure was the primary driver of carbon sequestration in all scenarios (>90.99 % contribution). Given the growing need for fisheries management to incorporate carbon sequestration considerations, particularly in marine ranching and other coastal ecosystems, the paper conclude by discussing the strengths and potential limitations of this framework and suggest directions for future development.

海洋牧场是人工构建的近岸生态系统，通过生物修复技术，如种群增加和人工珊瑚礁的部署，提高了碳固存效率。海洋牧场增强了碳固存，但缺乏可靠的评估方法。本文首先通过整合生态系统碳预算、动态碳循环、物种增强和渔业管理的影响，建立了一个可转移的海洋牧场碳封存评估框架，并将该框架应用于北部湾，以证明其通用性并确定其主要驱动因素。在野外调查数据的基础上，建立了Ecopath碳质量模型，并结合对数平均分度指数（LMDI）分析，拟合了Ecosim模型，模拟了12种种群增收-捕捞情景。结果表明，当前人工鱼礁的部署使海洋牧区的碳通量和总固碳量分别比对照区增加了2.52倍和3.43倍。模拟了“Mytilus +捕捞”情景（释放Mytilus同时保持当前捕捞），实现了峰值碳固存效率，是基线情景的2.21倍。LMDI分析显示，与群落结构相比，生物量规模的扩大是所有情景下碳固存的主要驱动力（贡献率为90.99%）。鉴于渔业管理日益需要纳入碳封存的考虑，特别是在海洋牧场和其他沿海生态系统中，本文最后讨论了这一框架的优势和潜在局限性，并提出了未来发展的方向。

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引用次数: 0

Effects of coastal erosion control interventions on Ocypode quadrata (Fabricius, 1787) populations on sandy beaches in southeastern Brazil 海岸侵蚀控制措施对巴西东南部沙滩上方形足鼠种群的影响

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-22 DOI: 10.1016/j.ecss.2025.109627

Adriane Baudson do Nascimento , Phillipe Mota Machado , Eduardo Manuel Rosa Bulhões , Leonardo Lopes Costa , Lucia Fanini , Ilana Rosental Zalmon

Engineering actions on beaches are a frequent approach to mitigate coastal erosion and flooding and to enable recreational use. These include “hard” approaches (e.g., rock revetments) and “soft” ones (e.g., beach nourishment). One species potentially affected by these interventions is the ghost crab Ocypode quadrata, used as an indicator of beach use impacts in the Americas. This study aimed to evaluate the effect of erosion control interventions on O. quadrata populations, proposing this species as a potential indicator for impact assessment and monitoring. The hypothesis is that coastal interventions negatively affect the species, reducing its abundance and size due to changes in sediment characteristics. Sampling was conducted on beaches in southern Espírito Santo, Brazil, from 2022 to 2024. A total of 10 sampling points were selected to ensure variability in beach features, urbanization, and coastal interventions, such as rock revetments and beach nourishment, allowing the identification of patterns and possible causal relationships involving ghost crab populations. Urbanization level was assessed using the Human Modification Metric (HMc) as a proxy, and erosion trends were calculated based on shoreline displacement. As response variables, burrow counts and diameter measurements were used as indicators of population abundance and body size. O. quadrata populations were negatively affected by both urbanization and erosion control structures. The nourishment project also reduced population abundance, but did not affect burrow diameter. The results highlight the species vulnerability to coastal interventions and urbanization, reinforcing its role as an indicator of disturbance and management on sandy beaches.

在海滩上采取工程行动是减轻海岸侵蚀和洪水的常用方法，并使其成为娱乐用途。这些方法包括“硬”方法（例如，岩石护岸）和“软”方法（例如，海滩营养）。这些干预措施可能影响的一个物种是鬼蟹，它被用作美洲海滩使用影响的指标。本研究旨在评价水土流失防治措施对方尺草种群的影响，提出方尺草作为影响评估和监测的潜在指标。假设是，海岸干预对该物种产生了负面影响，由于沉积物特征的变化，减少了其丰度和大小。从2022年到2024年，在巴西南部Espírito Santo的海滩上进行了采样。总共选择了10个采样点，以确保海滩特征、城市化和海岸干预（如岩石护岸和海滩营养）的可变性，从而确定鬼蟹种群的模式和可能的因果关系。以人类变化度量（HMc）为指标评估城市化水平，并基于岸线位移计算侵蚀趋势。以洞穴数量和直径测量作为种群丰度和体型的指标作为响应变量。城市化和水土流失控制结构均对方木种群产生负面影响。营养工程也降低了种群的丰度，但不影响洞穴直径。研究结果强调了物种对海岸干预和城市化的脆弱性，加强了其作为沙滩干扰和管理指标的作用。

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引用次数: 0

Where have all the tidal forests gone? Mapping losses of forested and emergent tidal wetlands on the Oregon coast, USA 潮汐林都去哪儿了？美国俄勒冈海岸的森林和潮汐湿地损失地图

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-09-17 DOI: 10.1016/j.ecss.2025.109542

Laura S. Brophy

How have tidal wetlands on the Oregon coast, USA changed over the past 200 years? Based on our previous studies, we hypothesized that amidst generally high tidal wetland losses from diking and conversion to agriculture, tidal forested wetlands (TFW) have been disproportionately impacted compared to tidal marsh. Elevation-based estuary extent maps were combined with spatial data on historical vegetation (1800s), current vegetation, and diked areas to map historical tidal wetlands by habitat class (emergent marsh, scrub-shrub, and forested) and to quantify losses or gains by class. The results show near-eradication of once-prevalent TFW. Historically, TFW and tidal marsh comprised similar proportions of tidal wetland area (54.4 % and 42.2 % respectively), but losses have been much higher for TFW than for marsh (95.0 % and 58.9 % respectively). Loss of historical tidal marsh was offset by a gain of 1770 ha through progradation, but no similar gain occurred for TFW. Past restoration has focused on tidal marsh, so this finding suggests a paradigm shift in management of Oregon's estuaries is warranted. The extreme loss of TFW has reduced the provision of key TFW ecosystem services, such as carbon sequestration and complex, productive salmonid habitat. Prioritizing TFW restoration could help re-establish these ecosystem services, benefiting coastal economies and ecosystems. Further research is needed to identify restoration sites with environmental conditions suitable for establishment and survival of TFW. Identification and prioritization of potential TFW restoration sites should account for sea-level rise to help ensure long-term persistence of this vital component of the Oregon coast's estuarine landscape.

在过去的200年里，美国俄勒冈海岸的潮汐湿地发生了怎样的变化？基于我们之前的研究，我们假设在堤防和农业转型导致的普遍较高的潮汐湿地损失中，潮汐森林湿地（TFW）受到的影响与潮汐沼泽相比不成比例。基于海拔的河口范围图与历史植被（19世纪）、当前植被和堤防面积的空间数据相结合，按生境类别（新兴沼泽、灌丛和森林）绘制历史潮汐湿地图，并按类别量化损失或收益。结果显示，一度流行的TFW几乎被根除。历史上，TFW和潮汐沼泽占潮汐湿地面积的比例相似（分别为54.4%和42.2%），但TFW的损失率远高于沼泽（分别为95.0%和58.9%）。历史潮汐沼泽的损失通过进积抵消了1770公顷，但TFW没有出现类似的增加。过去的恢复主要集中在潮汐沼泽上，因此这一发现表明，俄勒冈州河口管理的范式转变是有必要的。TFW的极端损失减少了TFW关键生态系统服务的提供，如碳固存和复杂的生产性鲑鱼栖息地。优先考虑TFW恢复可以帮助重建这些生态系统服务，有利于沿海经济和生态系统。需要进一步的研究，以确定恢复地点的环境条件，适合建立和生存的TFW。确定和优先考虑潜在的TFW恢复地点应该考虑到海平面上升，以帮助确保俄勒冈海岸河口景观的这一重要组成部分的长期持久性。

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引用次数: 0

Characteristics of benthic microeukaryotic communities in different ecosystems of the Yellow River Estuary salt marshes 黄河口盐沼不同生态系统底栖微真核生物群落特征

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2026-01-01 Epub Date: 2025-11-11 DOI: 10.1016/j.ecss.2025.109594

Jing Han , Lin Sun , Junrong Liang , Yahui Gao , Changping Chen

This study investigated benthic microeukaryotic communities in four intertidal salt marsh habitats (Phragmites australis, Suaeda salsa, Tamarix chinensis, and unvegetated mudflat) in the Yellow River Estuary during summer and winter. High-throughput sequencing of the 18S rRNA gene was employed to profile the communities, with a specific focus on the role of microalgae in sediment carbon sequestration. The results showed that benthic microeukaryotic communities were significantly influenced by seasons, habitats, and various environmental factors. Overall biodiversity was higher in winter, whereas the α-diversity index in summer exhibited a significant positive correlation with sediment carbon and nitrogen contents (p < 0.01). The results also suggested that biodiversity might be negatively correlated with sediment particle size to some extent. Notably, the Phragmites australis habitat exhibited distinct species richness and community composition relative to the other three habitats. Sediment carbon and nitrogen contents displayed distinct seasonal variations, with significantly higher concentrations in summer than in winter (p < 0.05). Furthermore, microalgae (e.g., Bacillariophyta and Chlorophyta) were important components of the benthic microeukaryotic community and were suggested to be key contributors to sediment organic matter. Based on these findings, we suggest that increased microalgal abundance may not only enhance interactions among community members but also facilitate the accumulation of organic carbon and nitrogen in intertidal sediments.

研究了黄河口4种潮间带盐沼生境（芦苇、沙豆沙、柽柳和无植被泥滩）夏冬季节底栖微真核生物群落。利用18S rRNA基因的高通量测序对微藻群落进行了分析，重点研究了微藻在沉积物固碳中的作用。结果表明，底栖微真核生物群落受季节、生境和各种环境因子的影响显著。冬季总体生物多样性较高，夏季α-多样性指数与沉积物碳氮含量呈极显著正相关（p < 0.01）。结果还表明，生物多样性与沉积物粒度可能存在一定的负相关关系。值得注意的是，芦苇生境的物种丰富度和群落组成明显高于其他3种生境。沉积物碳氮含量表现出明显的季节变化，夏季显著高于冬季（p < 0.05）。微藻（硅藻和绿藻）是底栖微真核生物群落的重要组成部分，是沉积物有机质的重要贡献者。基于这些发现，我们认为微藻丰度的增加不仅可以增强群落成员之间的相互作用，还可以促进潮间带沉积物中有机碳和氮的积累。

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引用次数: 0

Biodiversity gradients in Chilean fjords: latitude and habitat exposure to wave and wind shape decapod assemblages 智利峡湾的生物多样性梯度：纬度和栖息地暴露于波和风形状的十足类组合

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2025-12-01 Epub Date: 2025-10-08 DOI: 10.1016/j.ecss.2025.109558

Feliza Ceseña , Roland Meyer , Christian P. Mergl , Verena Häussermann , Günter Försterra , Roland R. Melzer

Decapod diversity in Chilean fjords decreases with latitude but shows opposite patterns between sheltered and exposed habitats. We analysed 889 specimens (54 species: 27 Brachyura, 18 Anomura, 8 Caridea, 1 Dendrobranchiata) from 231 sampling events (23 intertidal, 176 subtidal to 40 m) during the Huinay Fjordos expeditions (2005–2014) and 14 ex colns Zoologische Staatssammlung München ZSM). Sampling covered three ecoregions: the Araucanian Ecoregion (AE; warm-temperate, ∼33–42°S), the Chiloense Ecoregion (CE; cold-temperate, 42–47°S), and the Channels and Fjords of Southern Chile Ecoregion (FCSCE; subantarctic, 47–56°S). Data were evaluated using GIS-based grid-cell analyses and species accumulation curves (SACs) with extrapolation models (Chao, Jackknife, Bootstrap) implemented in BiodiversityR. Results confirm a north–south decline in species richness, with most species recorded in the AE, fewer in the CE, and the fewest in the FCSCE. However, exposure-related patterns differed between regions. In the FCSCE, richness decreased from the exposed coast toward sheltered inner fjords, while in the CE, species richness increased from exposed to sheltered sites. A plausible explanation is that fjords in the FCSCE are strongly influenced by glacial meltwater and halocline formation, which reduce biodiversity, whereas such influences are weaker in the CE and absent in the AE. For some taxa, differences between exposed and sheltered sites appear directly correlated with the presence or absence of a halocline. Although selective and restricted to shallow depths, hand collection by SCUBA proved effective in documenting cryptic and rare taxa in these remote fjord systems. The results highlight both latitudinal and habitat-related gradients shaping decapod assemblages and demonstrate the value of minimally-invasive sampling for biodiversity assessments and conservation-relevant baselines.

智利峡湾的十足类动物多样性随着纬度的增加而减少，但在隐蔽和暴露的栖息地之间表现出相反的模式。本文分析了2005-2014年Huinay Fjordos考察期间的231次采样（潮间带23次，潮下40 m 176次）和14次前Zoologische Staatssammlung m nchen ZSM)中889个标本（54种：27种腕足目，18种反常目，8种Caridea， 1种树endrobranchiata）。采样覆盖了三个生态区：阿劳坎尼亚生态区（AE；暖温带，~ 33-42°S）、奇洛ense生态区（CE；冷温带，42-47°S）和智利南部海峡和峡湾生态区（f欧安会；亚南极，47-56°S）。利用基于gis的网格细胞分析和物种积累曲线（SACs）对数据进行评估，并在BiodiversityR中实现外推模型（Chao, Jackknife, Bootstrap）。结果表明，物种丰富度呈南北递减趋势，AE中记录的物种最多，CE中记录的较少，f欧安会最少。然而，不同地区的暴露相关模式有所不同。在东西部，物种丰富度从暴露的海岸向隐蔽的内峡湾递减，而在东西部，物种丰富度从暴露的海岸向隐蔽的内峡湾递增。一个合理的解释是，f欧安会的峡湾受到冰川融水和盐斜形成的强烈影响，从而减少了生物多样性，而这种影响在东中国海较弱，在东中国海没有。对于某些分类群来说，暴露地点和隐蔽地点之间的差异似乎与盐跃层的存在与否直接相关。尽管有选择性且仅限于浅层，但事实证明，水肺手工采集在记录这些偏远峡湾系统中隐秘和稀有的分类群方面是有效的。研究结果强调了纬度和栖息地相关的梯度对十足类群落的影响，并证明了微创采样对生物多样性评估和保护相关基线的价值。

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引用次数: 0

Effect of turbulent diffusion and vertical advection due to hidden upwelling/downwelling in a continental slope zone on marine primary productivity 陆坡带隐伏上升流/下升流引起的湍流扩散和垂直平流对海洋初级生产力的影响

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2025-12-01 Epub Date: 2025-11-01 DOI: 10.1016/j.ecss.2025.109596

Alexander S. Mikaelyan, Andrey G. Zatsepin, Oleg I. Podymov, Alexander G. Ostrovskii, Sergey A. Mosharov, Valeriy K. Chasovnikov

The vast majority of marine upwellings are widely examined because they are detected at the water surface. At the same time, there are poorly studied so-called "hidden" upwellings, where significant vertical water movements occur at depth. In the north-eastern Black Sea, high-frequency observations using a moored CTD and current meter profiler revealed hidden upwelling and downwelling beneath the seasonal thermocline over the continental slope. Anomalies in the depth of the indicative isopycnal σθ = 14.5 kg m⁻³ relative to the annual mean values varied from −16 m (rising isopycnal) to +22 m (deepening). On average, the relative changes were −8.5 % and +7.2 %, respectively. In the layer 40–70 m below the photic zone, the turbulent diffusion coefficient (Kt) varied from 0.35 to 53 × 10⁻⁵ m² s⁻¹. The diffusive nitrate flux (F_dif) depended on Kt but more strongly on gradient of nitrate (N_grad). However, variations in F_dif were smoothed by the inverse changes in Kt (increasing during downwelling) and N_grad (increasing during upwelling), yielding a nearly phase-independent upward flux. Changes in the advective nitrate flux (F_adv) were driven by equally short upwelling/downwelling phases (∼5.5 days). The mean F_adv and F_dif were 0.68 and 0.22 mmol N m⁻² day⁻¹, respectively. Estimated monthly means of new primary production ranged from 30 to 153 mg C m⁻² day⁻¹ with an average f-ratio of 0.31. The only visible biological response was the redistribution of the chlorophyll-a below the photic zone at high Kt. Such an impact means that, in addition to the positive effect on F_dif, and, therefore on new PP in the water column, high Kt can limit growth of deep phytoplankton assemblages.

绝大多数海洋上升流被广泛研究，因为它们是在水面上检测到的。与此同时，人们对所谓的“隐藏”上升流的研究很少，在那里，深水处发生了显著的垂直水运动。在黑海东北部，使用系泊CTD和流计剖面仪的高频观测揭示了大陆斜坡上季节性温跃层下方隐藏的上升流和下升流。指示等平差σθ = 14.5 kg m−3相对于年平均值的异常在- 16 m（上升等平差）到+22 m（加深等平差）之间变化。平均而言，相对变化分别为- 8.5%和+ 7.2%。在光区下方40 ~ 70 m层，湍流扩散系数Kt在0.35 ~ 53 × 10−5 m2 s−1之间变化。硝态氮扩散通量（Fdif）与Kt有关，但与硝态氮梯度（Ngrad）关系更大。然而，Fdif的变化被Kt（在下降过程中增加）和Ngrad（在上升过程中增加）的反向变化所平滑，产生了一个几乎不依赖于相位的上升通量。平流硝酸盐通量（Fadv）的变化由同样短的上升流/下升流阶段（~ 5.5天）驱动。平均Fadv和Fdif分别为0.68和0.22 mmol N m−2 day−1。估计新初级产量的月平均值为30至153 mg C m−2 day−1，平均f比为0.31。唯一可见的生物反应是高Kt光区以下叶绿素-a的再分配。这种影响意味着，除了对Fdif产生积极影响，从而对水柱中的新PP产生积极影响外，高Kt还会限制深海浮游植物组合的生长。

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引用次数: 0

Characteristics and formation mechanism of the eddies in a continental slope in the Northern South China Sea 南海北部陆坡涡旋特征及形成机制

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2025-12-01 Epub Date: 2025-10-10 DOI: 10.1016/j.ecss.2025.109561

Li Li , Yuanhang Zhou , Hengye Gu , Wenlin Hu , Jianlong Li , Hui Shen , Zhiguo He

Ocean thermohaline dynamics play a crucial roles in global meteorology and coastal ecosystems. Eddies are ubiquitous in ocean thermohaline dynamics. In the summer of 2020, gliders deployed along the Qiongdongnan Slope (QDNS) of the northern South China Sea (NSCS) collected field data on temperature, salinity, and currents. These data were used to analyze the spatial and temporal characteristics of eddies and thermohaline structures on the QDNS. Observations revealed a convex, lens-shaped, three-dimensional thermohaline structure on the QDNS. The structure extended horizontally over 50 km, centered at 110.7°E, 17.7°N. Vertical temperature and salinity gradients peaked at −0.35 °C/m and 0.02 psμ/m, respectively. The lens-shaped structure appeared in late July and drifted westward from August to September. By late September, the structure had disappeared. The current flowed northeastward along the slope and gradually deflected east-southeastward. Overall, negative vorticity dominated the QDNS, indicating a clockwise rotational tendency. The lens-shaped thermohaline structure was likely generated by an eddy-induced thermohaline anomaly. Divergence played a primary role in forming the lens-shaped structure on the QDNS. Sensitivity tests suggest that eddy formation is strongly influenced by temperature and salinity at the open-ocean boundary. The study reveals the structure and formation mechanisms of eddies in continental shelf zones, underscoring the dynamic linkages between coastal and oceanic processes.

海洋热盐动力学在全球气象和沿海生态系统中起着至关重要的作用。涡旋在海洋热盐动力学中无处不在。2020年夏季，部署在南海北部琼东南坡（QDNS）的滑翔机收集了温度、盐度和洋流的野外数据。利用这些数据分析了QDNS上涡旋和温盐结构的时空特征。观测显示，QDNS上有一个凸透镜状的三维温盐结构。该结构水平延伸超过50公里，中心位于东经110.7°，北纬17.7°。垂直温度和盐度梯度峰值分别为- 0.35°C/m和0.02 psμ/m。透镜状结构出现在7月下旬，并在8月至9月向西漂移。到9月底，这座建筑消失了。水流沿坡向东北方向流动，并逐渐转向东南偏东方向。总体上，负涡度主导QDNS，呈现顺时针旋转趋势。透镜状热盐构造可能是由涡旋引起的热盐异常产生的。散度在QDNS上透镜状结构的形成中起主要作用。灵敏度试验表明，涡旋的形成受公海边界温度和盐度的强烈影响。该研究揭示了大陆架地区涡旋的结构和形成机制，强调了沿海和海洋过程之间的动态联系。

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引用次数: 0

Salinity-driven stratification enhances riverine mercury export to the coastal ocean 盐度驱动的分层促进了河流汞向沿海海洋的出口

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science

Pub Date : 2025-12-01 Epub Date: 2025-11-01 DOI: 10.1016/j.ecss.2025.109595

Roland P. Ovbiebo, Cathryn D. Sephus, Amina T. Schartup

Rivers transport 300 to 5000 Mg of mercury (Hg) annually to coastal oceans through estuaries, contributing 20–45% of total Hg input, with 100 to 1500 Mg reaching the open ocean. However, the impact of estuarine circulation and stratification on Hg transport and methylation remains uncertain despite their known influence on other metal exports. This study developed three models to assess Hg transformation under different salinity-driven stratification regimes—well-mixed, slightly stratified, and highly stratified—using data from the Chesapeake Bay (CPB) and Hudson River Estuary (HRE), U.S.A. Results show that stratification increases riverine Hg export by 19% in CPB and 20% in HRE, with shorter Hg residence times promoting faster export. Unstratified estuaries favor Hg burial in sediments due to longer residence times and increased particle settling. Seasonal river discharge variations further influence stratification, with higher discharge enhancing stratification and Hg export. Methylmercury (MeHg) production and export also respond to stratification, with slightly stratified conditions in CPB increasing MeHg production by 11.5% and export by 16.4%. As climate change is expected to intensify stratification in many estuaries, these findings suggest potential increases in Hg and MeHg export to coastal oceans.

河流每年通过河口向沿海海洋输送300至5000毫克汞（Hg），占汞总输入量的20-45%，100至1500毫克进入公海。然而，河口环流和分层对汞运输和甲基化的影响仍然不确定，尽管它们已知对其他金属出口有影响。本研究利用美国切萨皮克湾（CPB）和哈德逊河河口（HRE）的数据，建立了三种模型来评估不同盐度驱动的分层制度下的汞转化——充分混合、轻度分层和高度分层。结果表明，分层使CPB和HRE的河流汞出口分别增加19%和20%，汞停留时间越短，出口速度越快。由于停留时间较长和颗粒沉降增加，未分层的河口有利于汞在沉积物中的埋藏。季节性河流流量变化进一步影响分层，高流量增强分层和汞输出。甲基汞（MeHg）的生产和出口也对分层有反应，轻度分层的CPB条件使甲基汞产量增加11.5%，出口增加16.4%。由于气候变化预计会加剧许多河口的分层，这些研究结果表明，向沿海海洋出口的汞和甲基汞可能会增加。

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引用次数: 0