Journal of Marine Systems最新文献

{"title":"Application of JABBA-Select model to estimate biological reference points for bonga shad, Ethmalosa fimbriata (Bowdich, 1825) and lesser African threadfin, Galeoides decadactylus (Bloch, 1795) off the Central Gulf of Guinea","authors":"Edwin Egbe Atem,&nbsp;Richard Kindong,&nbsp;Collins Etah Ayuk,&nbsp;Moustapha Sly Bayon,&nbsp;Zhiwei Liu,&nbsp;Shiqing Zhao,&nbsp;Ousmane Sarr,&nbsp;Siquan Tian","doi":"10.1016/j.jmarsys.2026.104258","DOIUrl":"10.1016/j.jmarsys.2026.104258","url":null,"abstract":"<div><div>Small pelagic bonga shad (<em>Ethmalosa. fimbriata</em>) and demersal fish lesser African threadfin (<em>Galeoides. decadactylus</em>) are the major groups of commercial fisheries targeted by artisanal and industrial fleets in the Central Gulf of Guinea (CGG). These species account for 60–80% of the total marine fisheries landings in the CGG, and over 10 million people are dependent on the fisheries for sustainable livelihoods. However, accurate stock assessments for these species remain constrained by limited and inconsistent datasets. This study provides the first reliable stock assessment of bonga shad and lesser African threadfin (LATF) in the CGG using the surplus production model JABBA-Select. Catch (1990–2023) and CPUE (1990–2016) time-series data obtained from Fishery Committee for the Eastern Central Atlantic (CECAF) were analysed using Markov chain Monte Carlo (MCMC) estimation, convergence diagnostics, and sensitivity scenarios to evaluate parameter uncertainty and model robustness. JABBA-Select produced well-behaved posterior distributions and consistent retrospective patterns, indicating adequate model fit. For bonga shad, the current biomass rate (SB₂₀₂₃/SB_MSY) was 1.60 (CI:0.6, 2.3) and exploitation rate (H₂₀₂₃/H_MSY) was 0.40 (CI:0.5–1.77) suggesting the stock is healthy, with a 92.7% probability of the stock being underfished (in the green quadrant of the Kobe plot). In contrast, LATF is overfished, SB₂₀₂₃/SB_MSY was 0.70 (CI:0.30, 1.7); H₂₀₂₃/H_MSY = was 1.60 (CI:0.5, 4.7), with 66.5% probability of the stock being overfished (in the red quadrant of the Kobe plot) Stock trajectories indicate declining trends, with LATF exhibiting greater vulnerability in fishing pressure. Future projections (10-years) indicate that bonga shad yields should remain below 180,000 t, whereas LATF catches should remain below 7000 t to reduce depletion risk. These findings highlight the need for reduced fishing pressure, strengthened monitoring, and seasonal closures, particularly for LATF. This study demonstrates the effectiveness of JABBA-Select for data-poor tropical fisheries and provides scientific reference points for sustainable management in the CGG.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104258"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coupled ocean model based three-dimensional ecological regions and phytoplankton biomass variations in the Yellow Sea","authors":"Jae-Sung Choi,&nbsp;Byoung-Ju Choi,&nbsp;Hyoun-Woo Kang,&nbsp;Ok Hee Seo,&nbsp;Wonho Yih","doi":"10.1016/j.jmarsys.2026.104256","DOIUrl":"10.1016/j.jmarsys.2026.104256","url":null,"abstract":"<div><div>Effective marine ecosystem management requires a thorough understanding of ecological energy and material dynamics across multiple regions and timescales, as well as identifying factors that contribute to phytoplankton biomass variation in each region. This study used coupled physical-biogeochemical ocean model simulation results to identify the three-dimensional ecological regions and to understand spatiotemporal variations of driving factors for region-specific phytoplankton biomass in the Yellow Sea. The most pronounced spatial gradient of chlorophyll-a concentration was identified across both the tidal front and the thermocline. Five distinct ecological regions were identified, each separated by typical oceanographic boundaries: the surface layer (0–15 m), the subsurface chlorophyll maximum layer (15–30 m), the deep layer of offshore waters (&gt; 30 m), the eastern coastal region, and the western coastal region. The key findings of this study include: (1) defining three-dimensional ecological regions in the Yellow Sea, delimited by invisible oceanographic boundaries such as tidal mixing fronts and the thermocline, and (2) identifying specific physical, chemical, and biological driving factors contributing to region-specific seasonal variations in chlorophyll-a concentration.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104256"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tidal and residual dynamics in an Inland Sea fjord system","authors":"Joan Manuel Higueras-Sepúlveda,&nbsp;Mario A. Cáceres,&nbsp;Arnoldo Valle-Levinson","doi":"10.1016/j.jmarsys.2026.104259","DOIUrl":"10.1016/j.jmarsys.2026.104259","url":null,"abstract":"<div><div>Velocity measurements were collected to characterize the transverse flow structure of five across-channel circuits in the inland sea of Northern Chilean Patagonia. Current profiles were recorded with an Acoustic Doppler Current Profiler (ADCP) during repeated transects in each circuit, spanning a semidiurnal tidal cycle. Tidal current amplitudes increased southward as cross-sections became narrower and shallower. An analytical model adequately replicated the main features of tidal currents in three frictionally dominated transects in the Huemules and Quesahuén circuits. The observed residual flow patterns in the northern circuits varied from a two-layer quasi-geostrophic pattern in the Moraleda-Refugio and Del Medio passage to a three-layer pattern in Moraleda-Tuap, and to a laterally sheared pattern in southern circuits (Huemules and Quesahuén). The observed patterns showed similarities to other estuaries, but in fjords a three-layer residual flow is more common due to greater depth. A southward decrease in Kelvin (K_e) and Richardson (R_i) numbers suggested more influence of rotational effects and stratification in the northern transects, whereas a southward increase of the Ekman number (E_k) suggested an enhancement of frictional effects in the southern circuits. Across-channel dynamic balance in northern circuits was quasi-geostrophic and influenced by advection, whereas southern circuits were ageostrophic and dominated by friction. By applying estuarine circulation concepts to tidal and residual dynamics, this work revealed the transition from deep, wide, rotation-influenced northern fjords to narrow, shallow, friction-dominated southern passages. Most of the concepts of estuarine dynamics for plain, shallow estuaries applied to this fjord system.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104259"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Benthic food web dynamics and resource use during winter in Central Patagonian fjords (∼48°S)","authors":"Claudia D. Andrade,&nbsp;Taryn Sepúlveda,&nbsp;Chris Harrod,&nbsp;Cristobal Rivera,&nbsp;Cristian Aldea,&nbsp;Matthias Gorny,&nbsp;Américo Montiel","doi":"10.1016/j.jmarsys.2026.104253","DOIUrl":"10.1016/j.jmarsys.2026.104253","url":null,"abstract":"<div><div>The Katalalixar National Reserve (&gt; 6000 km²) in Central Patagonia, Chile, is rich in marine biodiversity but faces increasing environmental threats associated with climate change and expanding human activities, including salmon aquaculture. This study examines the trophic organization of the Katalalixar benthic food web, identifying energy sources for benthic communities and predicting their resilience to disturbance. Using stable isotope analyses (C, N, and S) combined with trophic niche modeling, we estimated the relative importance of food sources for different feeding modes during winter, a period of resource scarcity and reduced primary productivity. Bayesian mixing models revealed a structure of three trophic levels, primarily sustained by autochthonous organic matter from <em>Ulva lactuca</em> and <em>Macrocystis pyrifera</em>. Sedimentary organic matter served as a secondary source, while terrestrial- and pelagic-derived allochthonous organic matter provided trophic subsidies, highlighting adaptability in resource use. Isotopic niche comparisons showed opportunistic feeding in primary consumers, allowing exploitation of diverse resources, while higher trophic levels exhibited specialized feeding strategies. The community displayed greater trophic diversity and lower redundancy than other Patagonian areas, indicating a complex but vulnerable structure. Differences in niche widths among feeding modes suggested varying resilience, with suspension/filter feeders and grazers showing broader niches that may buffer against resource shifts. This study emphasizes the need to understand seasonal resource pulses and anthropogenic impacts, providing insights for management and conservation to protect Patagonian fjords amid aquaculture expansion and climate change.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104253"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microplastics in the gastrointestinal tracts of three fish species with different feeding guilds from Gorgan Bay, Caspian Sea","authors":"Mahsa Yazarloo,&nbsp;Aliakbar Hedayati,&nbsp;Mohammad Gholizadeh,&nbsp;Abdolazim Fazel,&nbsp;F. Joel Fodrie,&nbsp;Hossein Mostafavi,&nbsp;Amirparviz Salati","doi":"10.1016/j.jmarsys.2026.104257","DOIUrl":"10.1016/j.jmarsys.2026.104257","url":null,"abstract":"<div><div>Microplastics ((MPs) are emerging contaminants in aquatic ecosystems, yet information on species-specific exposure pathways in semi-enclosed environments of the Caspian Sea remains limited. This study investigated the abundance, characteristics, and polymer composition of MPs in the digestive tracts of three fish species representing different feeding guilds, Chelon saliens, <em>Cyprinus carpio</em>, and <em>Neogobius melanostomus</em>, from Gorgan Bay, Iran. By combining ecological comparison with complementary spectroscopic techniques (ATR-FTIR and Raman microspectroscopy), the study aimed to evaluate how feeding ecology and habitat use influence MP ingestion patterns and to improve confidence in polymer identification. Microplastics were detected in all examined species, with significantly higher abundance in the benthic-feeding <em>C. saliens</em> (mean ± SD: 3.63 ± 1.47 items fish⁻¹) compared with <em>C. carpio</em> (3.32 ± 1.63 items fish⁻¹) and <em>N. melanostomus</em> (2.95 ± 1.94 items fish⁻¹) (<em>p</em> &lt; 0.05). Fibers and fragments were the dominant particle types, while black, white, and gray particles were the most common color categories. Particles in the 100–500 μm size range predominated in <em>C. carpio</em> and <em>N. melanostomus</em>, whereas larger particles (500–1000 μm) were more frequently observed in <em>C. saliens</em>. Polymer analyses identified polyethylene (PE), polypropylene (PP), polyamide (PA), polystyrene, and polyester (PES) as dominant polymers. SEM–EDX analysis revealed weathered particle surfaces and heterogeneous elemental compositions. These findings suggest that feeding ecology and habitat use may influence MP exposure pathways in fish from Gorgan Bay and highlight the value of multi-method analytical approaches for reliable microplastic characterization in complex aquatic systems.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104257"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of oceano-climatic conditions in top predator temporal changes: Lessons from a 48-year long-term study in the southern Bay of Biscay","authors":"Émilie Milon,&nbsp;Iker Castège,&nbsp;Jean D'Elbée,&nbsp;Frank J.N. D'Amico","doi":"10.1016/j.jmarsys.2026.104250","DOIUrl":"10.1016/j.jmarsys.2026.104250","url":null,"abstract":"<div><div>Marine top predators have encountered numerous threats and environmental shifts over the past decades. The Bay of Biscay, an important hotspot for marine biodiversity encompassing both cold and warm-temperate water species, has been the focus of this long-term study. We examined temporal trends in relative abundance of 17 species in the southern Bay of Biscay, assessing their response to climate variability. Over a period of 48 years (1976–2023), data on the abundance of seabirds and cetaceans were collected using a standardized ship-based line transect monitoring. We applied a multivariate oceano-climatic index (MOCI) called the South Biscay Climate (SBC), based on oceanic and atmospheric conditions in the study area, and compared it with the univariate North Atlantic Oscillation index (NAO) and the Sea Surface Temperature (SST) variable. Over the last five decades, the SBC index has risen to positive values. These results indicated change in the local oceano-climatic conditions. Notably, we identified a major regime shift in 1989, aligning with a broader, well documented climatic transition across the North Atlantic in the late 1980s.</div><div>Our results highlighted temporal changes among species abundances, according to their thermal preference. A decrease in abundances of cold-temperate water species (e.g. <em>Hydrobates pelagicus</em>, <em>Rissa tridactyla</em>) was observed, whereas species with affinities to warm-temperate waters increased (e.g. <em>Delphinus delphis, Tursiops truncatus</em>), including the high conservation priority species Balearic shearwater (<em>Puffinus mauretanicus</em>). The SBC index explained a large part of the variation in the abundances of cold- (38.5%) and warm-temperate water species abundance changes (44.8%), and appeared to offer a more comprehensive approach for analyzing the intricate relationships between climate-related variations in species abundance. Understanding the change in abundances and impact of climate change in the south of the Bay of Biscay is fundamental to ongoing species conservation in the context of Marine Protected Areas management.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104250"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eddy-mediated aggregation of mesopelagic organisms in the North Atlantic","authors":"Jie Yang,&nbsp;Jianhui Li,&nbsp;Ge Chen","doi":"10.1016/j.jmarsys.2026.104248","DOIUrl":"10.1016/j.jmarsys.2026.104248","url":null,"abstract":"<div><div>Mesoscale eddies, dynamic oceanic features that span tens to hundreds of kilometers, influence the distribution and behavior of mesopelagic organisms by modulating nutrient fluxes and primary productivity. These organisms play a key role in trophic interactions and biogeochemical cycles but remain understudied in the context of eddies. This study investigates the aggregation patterns and diurnal migration behaviors of mesopelagic organisms within CE and AE cores in the North Atlantic using advanced BGC-Argo backscatter data extraction techniques. Our results reveal distinct aggregation patterns and diurnal migration behaviors of mesopelagic organisms within eddies: in the North Atlantic Current region, mesopelagic organisms exhibit clear habitat partitioning. At AE cores and CE peripheries aggregation intensity shows a negative association with dissolved oxygen concentration, indicating that organisms tend to occupy relatively low-oxygen, stratified layers within the eddy environment. These layers are also generally warmer, suggesting that fine-scale hydrographic and biogeochemical gradients jointly structure habitat use. Diel vertical migration amplitudes are greater in eddy cores than in peripheries, with AE cores showing 1.13 times the range of CE cores. Aggregation tends to be stronger during the mature–decay phases compared with the formation stage, consistent with variations in the amplitude-to-radius ratio. Overall, these findings suggest that mesoscale eddies play a role in shaping the spatial distribution and vertical migration behavior of mesopelagic organisms through coupled physical and biogeochemical mechanisms, and by influencing habitat selection and behavioral patterns, eddies are likely to affect trophic coupling and midwater ecosystem dynamics, with implications for carbon transport and fisheries management.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104248"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of the catastrophic flood event in May 2024 on continental water input and dissolved nutrient dynamics on the Southern Brazilian Continental Shelf","authors":"Maria Alice da Silva Witt,&nbsp;Ananda Quiles Bueno,&nbsp;Camila Fiaux Sukekava,&nbsp;Alessandra Gomes da Costa,&nbsp;Mariele Lopes de Paiva,&nbsp;Carlos Francisco Ferreira de Andrade,&nbsp;Mônica Wallner-Kersanach","doi":"10.1016/j.jmarsys.2026.104254","DOIUrl":"10.1016/j.jmarsys.2026.104254","url":null,"abstract":"<div><div>Climate change is expected to lead to more frequent and intense flooding. The present study investigated the impact of a catastrophic flood event that affected southern Brazil in April and May 2024. Dissolved inorganic nutrients were evaluated through this continental influx to the Southern Brazilian Continental Shelf (SBCS) via estuarine plumes and Submarine Groundwater Discharge (SGD), revealing new insights into the effects of the flood disaster. We applied ²²³Ra as an SGD tracer, together with physicochemical parameters, to assess these fluxes. Three main continental sources contributed to the shelf system: the Río de la Plata plume (RdP), the Patos Lagoon estuary (PL), and SGD, each supplying distinct macronutrient concentrations. The SGD was estimated as 5.5–35.8 × 10⁸ in 2023 and 2.8–18.2 × 10⁹ m³ day⁻¹ in 2024. In addition, the associated SGD nutrient fluxes exhibited a slight rise post-flood, which reached 3.4–22.1 × 10⁸ for Si, 1.5–9.7 × 10⁷ for DIP, and 1.5–9.9 × 10⁶ mol day⁻¹ for NO₂⁻ + NO₃⁻. During 2024, the nutrient distribution over the continental shelf exhibited elevated concentrations, particularly for NO₂⁻ + NO₃⁻ and silicate, compared with previous studies. These variables showed a strong negative correlation with salinity, indicating continental input, in contrast to the pattern observed in 2023. Furthermore, LP contributed to an increased turbidity plume associated with landslides in northern headwaters, which affects the input of silicate and NO₂⁻ + NO₃⁻, and high ²²³Ra activity associated with these sediments. The total water discharge of the RdP estuary exceeded the annual average by 21%, potentially providing nutrient-rich contributions to the shelf. Overall, the flood event enhanced SGD and estuarine fluxes, altering the coastal nutrient balance.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104254"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-resolution field acceleration measurements of a slack-moored buoy in a tidal estuary with a view to wave-energy applications","authors":"L.M. Rojas,&nbsp;F.E. Dotti,&nbsp;L. Oxarango,&nbsp;L. Battaglia,&nbsp;M.A. Storti","doi":"10.1016/j.jmarsys.2026.104251","DOIUrl":"10.1016/j.jmarsys.2026.104251","url":null,"abstract":"<div><div>A high-resolution field dataset of acceleration measurements from a slack-moored beacon buoy deployed in the Bahía Blanca estuary (Argentina) is presented. This study is motivated by the potential integration of wave-energy conversion devices on existing navigation buoy platforms, with particular attention to pendulum-based energy harvesters. The campaign spanned three continuous weeks, yielding over 18 million tri-axial acceleration samples at 10 Hz. The buoy response was interpreted by jointly considering the acceleration records, tidal predictions, and wind data from the Oceanographic Tower, located approximately 20 km from the measurement site. These external data were used as contextual information to identify broad environmental forcing regimes. The analysis reveals persistent dynamical features, including a low-frequency surge-pitch response consistently observed between 0.23–0.26 Hz and a wave-frequency band near 0.45 Hz. Intermittent amplified acceleration events are identified and interpreted as the possible combined effect of wave packets, wind–current interaction, and mooring-controlled dynamics. The spectral structure remains remarkably stable across the analyzed conditions, suggesting that the dominant buoy motions are governed by robust estuarine forcing and the intrinsic dynamics of the buoy-mooring system. Finally, a simplified pendulum-based energy-harvesting model is used to connect the measured acceleration levels with the expected order of magnitude of extractable power, showing the potential relevance of the dataset for preliminary wave-energy feasibility studies. To the authors’ knowledge, this is the first long-duration, high-frequency acceleration dataset for a moored buoy in a South Atlantic estuary. The dataset is publicly available to support model validation, benchmarking, and coastal and wave-energy engineering studies.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104251"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and temporal variability of submesoscale eddies over a broad and gently sloping continental shelf","authors":"Fernando Becker,&nbsp;Juan P. Pisoni,&nbsp;Silvia I. Romero","doi":"10.1016/j.jmarsys.2026.104252","DOIUrl":"10.1016/j.jmarsys.2026.104252","url":null,"abstract":"<div><div>Submesoscale eddies (SMEs) are critical for oceanic energy dynamics and nutrient transport. This study explores the potential generation mechanisms, temporal and spatial variability of SMEs, over a period of 11 years (2012 to 2022), in a wide continental shelf with a gentle slope and bathymetric terraces in the Southwestern Atlantic Ocean, the Argentine Continental Shelf. The analysis revealed space and time patterns of SMEs, with a notable increase in activity during colder months (autumn and winter) and a predominance of cyclonic structures over anticyclonic ones. Regions with high tidal energy dissipation, upwelling mechanisms, and frontal systems were identified as hotspots of SMEs occurrences. Moreover, cyclonic eddies were found to follow a tidal front’s seasonal migration pattern. Satellite-detected eddies exhibit predominantly elliptical shapes, suggesting the influence of horizontal shear and interactions with topographic interactions. Furthermore, over 96 % of the detected cyclonic and anticyclonic eddies have radii below the baroclinic Rossby radius of deformation, highlighting their small-scale nature (mostly under 12 km equivalent radius). This research provides a framework for future studies on SMEs in marine ecosystems, improving our understanding of their role in ocean dynamics and fisheries productivity.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"256 ","pages":"Article 104252"},"PeriodicalIF":2.2,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148542115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}