Continental Shelf Research最新文献

{"title":"Utility of satellite imagery in estimating coastal marine water attributes","authors":"Abdul Majid,&nbsp;Natrah Ikhsan,&nbsp;Zafri Hassan","doi":"10.1016/j.csr.2025.105509","DOIUrl":"10.1016/j.csr.2025.105509","url":null,"abstract":"<div><div>Coastal water resources are essential for sustaining biodiversity and community well-being, yet rapid population growth and climate change increasingly threaten their sustainability. Satellite remote sensing has emerged as a powerful tool for monitoring coastal water quality due to its extensive spatial coverage, cost effectiveness, and rapid data acquisition. The scientific community has seen considerable advances in recent years through these technologies. In view of these developments, this study presents a scoping review of 465 peer-reviewed journal articles published between 2019 and 2024, sourced from Scopus. The analysis identifies commonly used satellite platforms for assessing five critical water quality parameters chlorophyll-a (Chl-a), temperature, colored dissolved organic matter (CDOM), pH, and phosphate across predefined climatic zones and water types. We further examine prevalent algorithmic approaches and validation metrics. Findings indicate that most studies rely on data from Aqua, Sentinel, and Landsat satellites. Results also reveal that Chl-a and temperature are the most widely measured parameters, particularly in temperate and subtropical marine waters, whereas Arctic regions and freshwater systems remain understudied. Recent trends show a growing reliance on empirical and machine learning based algorithms, with root mean square error (RMSE) and coefficient of determination (R²) as the most common validation metrics. These results highlight the need for standardized validation protocols and expanded research efforts in underrepresented regions and parameters to enhance global water quality monitoring.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105509"},"PeriodicalIF":2.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365769","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":"Comparing and improving different methods to quantify silt and clay abundance within estuarine mud","authors":"G. Mariotti ,&nbsp;A. Tweel ,&nbsp;G. Gababa ,&nbsp;A.K. Tymul","doi":"10.1016/j.csr.2025.105508","DOIUrl":"10.1016/j.csr.2025.105508","url":null,"abstract":"<div><div>Estuarine mud (also referred to as “fine-material”) is comprised of clay and silt particles, whose settling velocity differs by up to four orders of magnitude. Hence, quantifying their relative abundance within the mud fraction is key to understand and predict estuarine mud dynamics. Here we improve this quantification, using mud from two differing estuaries, one with a low clay-mud ratio (Massachusetts, northeast coast of USA) and one with a high clay-mud ratio (South Carolina, southeast coast of USA). First, we compare four different laboratory methods (XRD, laser diffraction, pipette method, Owen tube) to estimate the clay-mud ratio. Estimates based on laser diffraction are confounded by the fact that particles in the 2–30 μm size class could be either silt or “hyper-stable clay aggregates”, but this can be resolved by using the particle size distribution of pure clay as a reference. With this correction, laser diffraction agrees with the other three methods. Second, we show that optical backscatter (turbidity) and acoustic backscatter provide – at least under laboratory settings – a good estimate of suspended clay and silt, respectively. These two measurements correctly estimate the clay-mud ratio of the two samples, and also provide an estimate of silt and clay settling velocity in still water. These velocities are consistent with those from standard settling tests (Owen tube). Turbidity and acoustic backscatter should be able to monitor suspended clay and silt concentration in the field, provided that sand is negligible.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105508"},"PeriodicalIF":2.1,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471186","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":"Ingestion of prey intensifies microplastic load in Mediterranean commercial fish","authors":"Alessandra Cera ,&nbsp;Silvia Secco ,&nbsp;Iliana Matarazzi ,&nbsp;Monica Orsini ,&nbsp;Serena De Santis ,&nbsp;Massimiliano Scalici","doi":"10.1016/j.csr.2025.105496","DOIUrl":"10.1016/j.csr.2025.105496","url":null,"abstract":"<div><div>We describe the ingestion of plastics by four edible fish species from the Western Mediterranean Sea (Fiumicino, Italy): <em>Micromesistius poutassou</em>, <em>Mullus barbatus, Sardina pilchardus</em>, and <em>Trachurus trachurus.</em> Microparticles smaller than 1 mm, particularly blue fibres made of cellophane, are the most found in terms of size, colour, shape, and polymer. The highest level of contamination was found in <em>Sardina pilchardus</em> and in stomachs containing prey across all species. We have gathered evidence from commercially relevant fishes, of which two can be good bioindicators of microplastics <em>(M. barbatus</em> and <em>T. trachurus</em>)<em>,</em> and one is poorly investigated <em>(M. poutassou)</em> in order to contribute to the overall assessments of the MP-induced risks for the Mediterranean ecosystem and human activity.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105496"},"PeriodicalIF":2.1,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518230","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":"Assessment of the sediment budget of the Kara and Laptev seas","authors":"Valeriy Y. Rusakov ,&nbsp;Тat'yana G. Kuz'mina ,&nbsp;Ruslan A. Lukmanov","doi":"10.1016/j.csr.2025.105506","DOIUrl":"10.1016/j.csr.2025.105506","url":null,"abstract":"<div><div>The rapid acceleration of global warming since the 20th century is expected to significantly influence sediment budget on the Siberian Arctic Shelf. However, comprehensive data on the sediment budget required to assess these changes remain insufficient. In this study, we evaluate sediment mass accumulation rates (MAR) in the extensive coastal Arctic seas, the Kara and Laptev seas, over the past 100 years based on ²¹⁰Pb dating with the RUS2023 model. Our results showed that MARs in the Gulf of Ob’ and Yenisei Bay are 1.37 and 1.4 g cm⁻² yr⁻¹, respectively. MARs in the Novaya Zemlya, Voronin and Sadko troughs are 1.46, 0.82 and 1.99 g cm⁻² yr⁻¹, respectively. MARs in the inner and outer Laptev Sea shelf are 1.26 and 0.72 g cm⁻² yr⁻¹, respectively. These values are at least ten times higher than previously estimated values obtained using AMS ¹⁴C dating over the past few thousand years. The unprecedented increase in the total mass sediment accumulation over the past 100 years may be due to accelerated coastal erosion and soil erosion in the Siberian River catchments, located in the permafrost zone.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105506"},"PeriodicalIF":2.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270816","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":"Radionuclides and heavy metals in surface sediments of the Bering and Chukchi Seas: distribution, source identification, and risk assessment","authors":"Jing Lin ,&nbsp;Qiangqiang Zhong ,&nbsp;Rong He ,&nbsp;Fule Zhang ,&nbsp;Hao Wang ,&nbsp;Liang Wang ,&nbsp;Dekun Huang ,&nbsp;Tao Yu","doi":"10.1016/j.csr.2025.105507","DOIUrl":"10.1016/j.csr.2025.105507","url":null,"abstract":"<div><div>The Arctic region can no longer be considered a pristine environment, and radioactive and heavy metal pollution have become a growing concern. The present study was conducted to investigate the distributions, sources, and risk assessments of radionuclides and heavy metals in surface sediments from the Bering and Chukchi Seas. The mean activities of ⁴⁰K, ¹³⁷Cs, ²²⁸Th, ²²⁶Ra, ²²⁸Ra, ²³⁸U, and ²¹⁰Pb in sediments were 446, 0.97, 24.2, 27.6, 22.2, 23.6, and 72.8 Bq/kg, respectively. Radiological hazard indices suggested that the sediments did not pose a significant radiological risk to humans. The mean Cu, Pb, Cd, Cr, and Zn contents were 18.4, 14.1, 0.231, 47.2, and 88.7 μg/g, respectively. The geoaccumulation and pollution load indices demonstrated that heavy metal accumulation (Cu, Pb, Cd, and Zn) existed at some sites of the study area. Multivariate statistical analyses suggested that Cu, Pb, Cr, and Zn likely originated from natural sources, while Cd was derived from both natural processes and fossil fuel burning.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105507"},"PeriodicalIF":2.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262134","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":"Residual flow in a deglaciated coastal bay with low freshwater input","authors":"Taylor Bailey,&nbsp;Lauren Ross,&nbsp;Cristian Rojas","doi":"10.1016/j.csr.2025.105505","DOIUrl":"10.1016/j.csr.2025.105505","url":null,"abstract":"<div><div>The drivers of the tidal and residual flows in estuaries can vary spatially and temporally due to geomorphic complexities, fortnightly tides, and climatic influences. In this paper, we explore the mechanisms that give rise to the circulation patterns in Frenchman Bay, Maine, on the Eastern Coast of the USA, under varying freshwater input conditions and fortnightly tidal phases, using idealized simulations from a high-resolution, three-dimensional numerical model. The results of the simulations at the tidal timescale reveal a tidal asymmetry in vorticity, where vorticity generated during flood tide is not spun-down during the subsequent ebb. This asymmetry prompts the investigation of the residual circulation in the bay which is characterized by large tidal residual eddies. These eddies are found to persist in the depth-averaged residual flow regardless of the freshwater input or tidal phase, leading to the conclusion that the eddies are “geomorphically-constrained” in the bay. Analysis of the horizontal momentum terms and a simulation performed without Coriolis forcing demonstrates that the tidal stress terms predominantly balance the barotropic pressure gradient to give rise to the eddy patterns, while the Coriolis force acts to strengthen their vorticity. The eddies create a laterally sheared residual flow structure with depth, however the flow is more vertically sheared during the neap tide when the baroclinic pressure gradient plays a larger role. These findings demonstrate the persistence of tidal residual eddies regardless of freshwater input or fortnightly tidal phase in a geomorphically complex deglaciated coastal bay with low freshwater input.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105505"},"PeriodicalIF":2.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240775","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":"Semi-enclosed coastal systems of South America: compilation and dynamic-based classification","authors":"Óscar Álvarez-Silva ,&nbsp;Juan F. Paniagua-Arroyave ,&nbsp;Edgar Cantero ,&nbsp;Guilherme C. Lessa ,&nbsp;Diego Moreira ,&nbsp;Lauren Ross ,&nbsp;Pablo Santoro ,&nbsp;Carlos A.F. Schettini ,&nbsp;Megan E. Williams ,&nbsp;Arnoldo Valle-Levinson","doi":"10.1016/j.csr.2025.105493","DOIUrl":"10.1016/j.csr.2025.105493","url":null,"abstract":"<div><div>Semi-enclosed coastal water systems (SECS) provide essential ecological and economic services. Their sustainable use requires a baseline understanding of the physical dynamics that control their water quality, morphology, and environmental stability. This paper aims to provide an overview of the current state of knowledge on the physical processes in SECS in South America, a megadiverse region that encompasses five of the largest river systems in the world. To achieve this goal, we compiled data from satellite imagery, geological and hydrological maps, and peer-reviewed literature. The information derived from these sources allowed comparisons among systems according to the level of understanding of their local hydrodynamics. Moreover, a recent dynamic classification was employed to identify the main physical forcings of those SECS with sufficient data. 898 SECS were identified in the continent, including deltas, alluvial estuaries, and coastal lagoons. A review of over 500 peer-reviewed publications revealed that 74 systems exhibited enough data to render a dynamic classification possible. In addition, 18 SECS stood out by the advanced understanding of their physical processes. The analysis presented here synthesizes the current understanding and provides an outlook of future challenges. We emphasize the need for continued monitoring of these systems to inform management strategies and mitigate the impacts of environmental stressors.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105493"},"PeriodicalIF":2.1,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240774","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":"Molecular composition characteristics of marine Synechococcus reflect the highly environmental heterogeneity in the shelf seas","authors":"Jialin Li ,&nbsp;Feng Shi ,&nbsp;Huiwang Gao ,&nbsp;Song Qin","doi":"10.1016/j.csr.2025.105495","DOIUrl":"10.1016/j.csr.2025.105495","url":null,"abstract":"<div><div><em>Synechococcus</em>, a dominant group of marine photosynthetic picophytoplankton, play a crucial role in primary productivity and carbon cycling within shelf seas. Its distribution patterns are highly sensitive to environmental changes, rendering it a valuable indicator for assessing ecosystem responses to both climate change and anthropogenic pressures. Nonetheless, the relationships between the genetic diversity of <em>Synechococcus</em> and environmental heterogeneity in the Bohai Sea and Yellow Sea have not been thoroughly explored. Here, we employed the high-throughput sequencing method to investigate the phylogenetic and phenogenetic diversity of <em>Synechococcus</em> in the Bohai and Yellow seas, revealing distinct genotype compositions depending on typical habitats. Regarding phylogenetic distribution, both S5.1 clades I and VI dominated in the Bohai Sea with an average proportion of 25.47 % and 26.20 %, respectively; while clades I and II became predominant in the Yellow Sea accounting for 47.72 % and 14.82 %, respectively. Phenogenetically, type 2 dominated in the Bohai Sea occupying 53.15 %; types 3a and 3dA were dominant in the Yellow Sea accounting for 49.51 % and 40.88 %, respectively. Temperature and salinity were identified as key environmental constraints influencing the distribution patterns of <em>Synechococcus</em>. At the sub-group level, clade IX and type 3dA showed distributions closely related to salinity, whereas types 3a were primarily influenced by dissolved oxygen. The findings underscored the significant correlations between the distribution patterns of <em>Synechococcus</em> and environmental properties, which were further supported by cluster results demonstrating similar patterns obtained through principal component analysis. These findings highlight the application potential of spatial niche analysis based on <em>Synechococcus</em> molecular markers in reflecting environmental changes in shelf seas. Future studies should focus on elucidating the molecular regulatory mechanisms governing the distribution patterns of <em>Synechococcus</em>, thereby providing a critical foundation for understanding the responses of keystone species to environmental stresses in shelf ecosystems.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"292 ","pages":"Article 105495"},"PeriodicalIF":2.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240776","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":"Are shallow-water hydrothermal vents stable? A comparison of published maps of the Paleochori Bay (Milos, Greece) systems twenty years apart","authors":"Alice Oprandi ,&nbsp;Carlo Nike Bianchi ,&nbsp;Carla Morri ,&nbsp;Martina Canessa","doi":"10.1016/j.csr.2025.105494","DOIUrl":"10.1016/j.csr.2025.105494","url":null,"abstract":"<div><div>The shallow-water hydrothermal vents in Paleochori Bay (Milos Island, Greece) are among the most active and well-known volcanic systems in the world. Despite almost three decades of research, however, their spatial and temporal variability remains poorly understood because of the dearth of reliable and repeated measurements. Diachronic analysis on GIS (Geographical Information System) platform allowed comparing seafloor maps of the area produced in the 1990s and 2010s to assess spatial stability or change in the main hydrothermal features (largest microbial mats). Notwithstanding differences between methods and observers, the comparison provided suggestive evidence that in two decades the main hydrothermal features of Paleochori Bay have shifted from their original location and changed in both extent and composition. Our study is the first of this type on shallow-water hydrothermal vents; further studies in other regions and repeated mapping in Paleochori Bay will be needed to understand the dynamics of these systems, both for research and management.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"291 ","pages":"Article 105494"},"PeriodicalIF":2.1,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184440","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 hydrodynamics on the Amazon Continental Shelf: an observational approach","authors":"Pedro Paulo de Freitas ,&nbsp;Mauro Cirano ,&nbsp;Carlos Eduardo Peres Teixeira ,&nbsp;Sávio Jeliel Roque Melres ,&nbsp;Antony Kadu Carvalho dos Santos de Sousa ,&nbsp;Vando José Costa Gomes ,&nbsp;Camilo Andrés Guerrero-Martin ,&nbsp;Ariane Koch-Larrouy","doi":"10.1016/j.csr.2025.105491","DOIUrl":"10.1016/j.csr.2025.105491","url":null,"abstract":"<div><div>Amazon Continental Shelf (ACS) presents highly energetic hydrodynamics, modulated by multiple forcing mechanisms, and significant socio-economic and climate importance. This study characterizes the spatial-temporal variability of hydrodynamics on the ACS between 2°S and 4°N based on in situ data of 6 coastal sea level stations provided by IBGE, BNDO and SiMCosta, velocity measurements from 201 drifters of NOAA Global Drifter Program and 3 moorings of the AMANDES III project, and 127 CTD profiles from AMANDES and REVIZEE projects. The analysis of the coastal sea level shows that the tidal band contributes for 95 % (Santana, Amapá shelf) to 99 % (Turiaçu and Ribamar, Maranhão shelf) of the temporal variability of the sea level. Moreover, it shows that characteristics typical of a macrotidal regime occur up to 75 % and 41 % of the time at Turiaçu and Salinópolis, the eastern and central regions of the ACS, respectively. Velocity time series from drifters and moorings reveal a northwestward flow pattern along the ACS, which is associated with wind-driven circulation. The semidiurnal tides play a crucial role in the temporal variability of the cross-shelf velocity component, reaching a maximum percentage importance of 90 % on the central region of the ACS. Residual currents (without tides) are more pronounced in the alongshelf component. Their percentage importance increases towards the western shelf, from 68 % (73 %) and 20 % (10 %) in the upper (lower) water column at the eastern shelf, to 95 % (90 %) and 54 % (46 %) in the alongshelf and cross-shelf components, respectively. The wavelet analysis of the residual currents reveals high energy in two distinct period bands between 4 and 20 days and longer than 20 days at all moorings. The first period band is associated with wind modulations, while the second band indicates influence of the North Brazil Current (NBC) fluctuations. The time series of Richardson numbers show that the central and western shelves are stable for most of the time (&gt;70 %). The stratification (N2) and vertical velocity shear (S2) parameters increase toward MAM4 (western shelf) associated with the spreading of the Amazon River plume and the increased influence of the NBC on the speed and direction of currents in the outer shelf. The TS diagrams show the presence of three distinct water masses on the ACS: coastal water influenced by river discharge, mixed water, and oceanic water.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"291 ","pages":"Article 105491"},"PeriodicalIF":2.1,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139305","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}