Continental Shelf Research最新文献

{"title":"Dynamics of the subtidal transport through the Guafo Mouth connecting the open ocean and the Chilean Inland Sea in southern Chile","authors":"Valentina Mundaca ,&nbsp;Vincent Echevin ,&nbsp;Odette A. Vergara ,&nbsp;Osvaldo Artal ,&nbsp;Héctor H. Sepúlveda","doi":"10.1016/j.csr.2025.105428","DOIUrl":"10.1016/j.csr.2025.105428","url":null,"abstract":"<div><div>The Chilean Inland Sea (CIS) and the fjords region in Southern Chile host human activities such as salmon aquaculture. During the productive austral summer, the CIS exchanges heat, salt, dissolved oxygen, and nutrients with the Southern Pacific Ocean via the Guafo Mouth, a very shallow strait. Tides influence the productivity of the CIS, a high-frequency forcing typically not considered in circulation models when estimating exchange fluxes. In this work, the inflow, outflow, net, mass, and nutrient fluxes through the Guafo Mouth are evaluated using a high-resolution regional model forced by tides. Model output (temperature, salinity, and currents) is compared to hydrodynamic data. The impact of tidal forcing on summer-mean currents and transports is quantified. These findings are compared with results from a lower-resolution, commonly used, general circulation model. A Lagrangian modeling approach highlights that the water masses transiting from the open ocean through the Guafo Mouth mainly originate from the region south of the mouth.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"288 ","pages":"Article 105428"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610698","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":"Corrigendum to “Biochemical implications of the Bottom Boundary Layer Detachment at the Mid-Atlantic Bight shelf-break front” [Continent. Shelf Res. 286 (2025) 105408]","authors":"Serena Negroni ,&nbsp;Dennis J. McGillicuddy ,&nbsp;Glen G. Gawarkiewicz ,&nbsp;Paolo Oddo ,&nbsp;Nadia Pinardi","doi":"10.1016/j.csr.2025.105448","DOIUrl":"10.1016/j.csr.2025.105448","url":null,"abstract":"","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"288 ","pages":"Article 105448"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642150","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":"Disruptive synergism: The Co-occurrence of scyphozoan Pelagia noctiluca (Forsskål, 1775) swarms with green tide-causing dinoflagellate Noctiluca scintillans (Macartney) Kofoid & Swezy, 1921","authors":"Alfisa Siddique,&nbsp;Naveen Sagar Garbhapu,&nbsp;V.V.S.S. Sarma","doi":"10.1016/j.csr.2025.105447","DOIUrl":"10.1016/j.csr.2025.105447","url":null,"abstract":"<div><div>The swarming behavior of certain scyphozoan clades, such as <em>Pelagia noctiluca</em> (Forskål, 1775), highlights an evolutionary advantage. These adaptations promote survival and reproductive success, resulting in mass occurrences. <em>P. noctiluca</em>, notorious for its ecological disruption and harmful stings, swarms in response to nutrient availability. This study is the first to document the co-occurrence of a swarm of <em>P. noctiluca</em> (120–180 ind. m⁻³) and a bloom of <em>Noctiluca scintillans</em> (Macartney) Kofoid &amp; Swezy, 1921 (2.68 x 10³-4.32 × 10³ cells L⁻¹) in the Bay of Bengal, Indian Ocean. The study suggests that <em>N. scintillans</em> grazes on phytoplankton in nutrient-rich waters due to reduced competition from <em>P. noctiluca</em>'s opportunistic feeding on zooplankton. This interaction gives <em>N. scintillans</em> a competitive edge, allowing both species to co-exist and significantly impact the marine ecosystem. The proliferation of <em>N. scintillans</em>, supported by favorable conditions, is intertwined with <em>P. noctiluca</em>'s feeding dynamics, posing significant ecological and economic challenges. Continuous monitoring is essential to understand the swarming and migration patterns of <em>P. noctiluca</em> in the Indian Ocean, as their outbreaks indicate a broader ecosystem shift influenced by climate change and altered prey availability.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"288 ","pages":"Article 105447"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526765","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":"Quantifying the relative contributions of forcings to the variability of estuarine surface suspended sediments using a machine learning framework","authors":"Juliana Tavora ,&nbsp;Roy El Hourany ,&nbsp;Elisa Helena Fernandes ,&nbsp;Isabel Jalón-Rojas ,&nbsp;Aldo Sotollichio ,&nbsp;Mhd Suhyb Salama ,&nbsp;Daphne van der Wal","doi":"10.1016/j.csr.2025.105429","DOIUrl":"10.1016/j.csr.2025.105429","url":null,"abstract":"<div><div>The influence of forcing mechanisms on the variability of suspended sediments in an estuary is, for the first time, synoptically quantified over prevailing ('normal') conditions and extreme events. This study investigates the complex and non-linear influence of tides, river discharge, and winds on the variability of suspended sediments in the macrotidal Gironde Estuary, France. Employing a machine learning-based framework, we integrated high-frequency field data, hourly numerical modeling outputs, and semi-daily satellite remote sensing to spatially quantify the relative contributions of forcing mechanisms. Our results reveal that tides are the primary driver of sediment variability (42.3–58.9%), followed by river discharge (21.2–34.7%) and wind (8.7–16.9%). Uncertainties range between 7% and 13.6%. In addition, the spatial variability of their contributions is consistent across numerical modeling and satellite remote sensing data, with differences not exceeding 10%. However, satellite data is limited by cloud cover and may miss extreme events. In contrast, hourly numerical modeling indicates tides are the dominant forcing mechanism under extreme events significantly affecting suspended sediment variability in the estuary. This study verifies the effectiveness of our machine learning approach against traditional Singular Spectral Analysis using field data. We demonstrate that machine learning techniques can effectively synthesize spatial distribution patterns of hydrodynamic and sedimentological variability, including the influence of winds. Our findings highlight not only the potential of satellite observations to analyze prevailing conditions despite data gaps but also that with hourly numerical modeling, the impact of forcings can be synoptically quantified under prevailing ('normal') conditions and extreme events.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105429"},"PeriodicalIF":2.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444638","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":"Stepwise variations of nutrients and organic matter in the fragmented Changjiang River by two big “dams”: One visible and one invisible","authors":"Ailin Yao ,&nbsp;Yue Ming ,&nbsp;Mengyu Wang ,&nbsp;Xintong Jiang ,&nbsp;Lixin Zhu ,&nbsp;Xianye Wang ,&nbsp;Lei Gao","doi":"10.1016/j.csr.2025.105438","DOIUrl":"10.1016/j.csr.2025.105438","url":null,"abstract":"<div><div>The transport flux of biogenic elements from large rivers such as the Changjiang (Yangtze) River, played a critical role in determining the estuarine and coastal environments. However, the combined effects of human activities and natural factors had resulted in complex spatiotemporal variations of biogenic elements along the river. In this study, sampling was conducted on four campaigns through the Changjiang River in different seasons during 2021 and 2022. The results showed that two suspended particulate matter (SPM) Surge Zones with rapidly increased SPM concentrations emerged, one between Yichang and Yueyang, downstream of the Three Gorges Dam (TGD), and the other between Wuhu and Xuliujing, upstream of the estuarine area. The two SPM Surge Zones had acted as the two “dams” or “walls” that separated the Changjiang River mainstream and led to the formation of two SPM Deposition Zones, one in the Three Gorges Reservoir (between Chongqing and Yichang), and the other in the middle and lower reaches (between Wuhan and Wuhu). Within these SPM Deposition Zones, SPM concentrations slowly decreased, and the proportion of particulate organic carbon in SPM increased. This reservoirization of the river water hindered the concentration increase of nutrients with the river flow, despite their continuous supplies from river banks by anthropogenic activities. The different patterns of nutrients and organic matter variations in the SPM Surge Zones and in the SPM Deposition Zones highlighted a “stepwise” characteristic in their distribution. The Changjiang River showed a deeply reservoir-like characteristic at present, which, along with other anthropogenic activities, had also driven significant decadal trends of nutrients and organic matter in the river waters.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105438"},"PeriodicalIF":2.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453694","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":"Why does surface chlorophyll-a bloom in Taiwan Shoal all year round?","authors":"Qi Feng ,&nbsp;Rufa’i Isyaku ,&nbsp;Yulin Zhu ,&nbsp;Ling Hao ,&nbsp;An Zhang ,&nbsp;Xin Zhou ,&nbsp;Haibin Lü","doi":"10.1016/j.csr.2025.105437","DOIUrl":"10.1016/j.csr.2025.105437","url":null,"abstract":"<div><div>Based on 10 years (January 2012–December 2021) of satellite observations, sea surface chlorophyll-a (Chl-a) was found to be present in the Taiwan Shoal throughout the year. The underlying mechanisms were investigated. The seasonal mechanism was investigated based on satellite remote sensing data, reanalysis data, and Argo buoy data. The relationship between the seasonal variation of Chl-a and sea surface temperature (SST), wind speed, photosynthetically active radiation (PAR) and salinity in Taiwan shoals was calculated. The results revealed that a large amount of Chl-a was present in the study area throughout the year, where the Chl-a concentration reached a maximum of 0.88 mg m⁻³ in July, which was 1.76 times greater than that (0.50 mg m⁻³) in April. In summer, there was increased upwelling and a thinner mixed layer, which pulled the bottom nutrients to the surface and led to the inflow of South China Sea water (SCSW) with Chl-a in the horizontal direction. In winter, the Kuroshio Branch Water (KBW) intrusion and the inflow of Chinese coastal water into the northern part of the Taiwan Strait (TWS) resulted in a zone of high temperature gradient, whereas the strong northeasterly monsoon strengthened the vertical mixing of the study area, which coincided with the zone of high Chl-a values. The combination of nutrient-rich waters, suitable temperatures in spring, and sufficient photosynthetically active radiation (PAR) in autumn provides favorable conditions for the accumulation of surface Chl-a. This study provides valuable insights into the ecological impacts of seasonal variations in Chl-a blooms in the TWS.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105437"},"PeriodicalIF":2.1,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436757","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":"Spatio-temporal variability of surface phytoplankton community structure in relation to different water systems in the east China sea coast","authors":"Anglu Shen ,&nbsp;Shuaishuai Su ,&nbsp;Haowen Li ,&nbsp;Wei Kang ,&nbsp;Rui Jia","doi":"10.1016/j.csr.2025.105426","DOIUrl":"10.1016/j.csr.2025.105426","url":null,"abstract":"<div><div>The East China Sea coast (ECS) is characterised by a diverse range of landform types, which influence the physical characteristics of the local waters. The spatio-temporal phytoplankton community structure, and the salinity, transparency, and temperature gradients were examined across six different waters of the ECS coast during four seasons. In total, 118 taxa were identified, including 86 Bacillariophyta, 16 Pyrrhophyta, and 16 other taxa. Cluster and multidimensional scaling analyses classified the six study areas into inner the estuary, outer the estuary, and in a semi-enclosed bay. Notable variations were observed in the abundance and species distribution patterns of phytoplankton across the three water types during four seasons. <em>Oscillatoria</em> spp. was the dominant species inner the estuary during the spring, summer, and winter cruises. <em>Coscinodiscus</em> spp. and <em>Skeletonema costatum</em> were the dominant species in all study areas; however, as the main dominant species, there were no significant differences in <em>Coscinodiscus</em> spp. abundance at different dimensional scales. In addition, the biodiversity index values showed no statistically significant differences among the three types of water, except during the summer cruise. Spearman's rank correlation and redundancy analyses showed that the distribution of Chlorophyta was primarily influenced by salinity. In contrast, transparency was the primary driver of phytoplankton abundance for most seasons and temperature exerted the most significant effect on phytoplankton abundance during summer. These findings indicate that physical disturbances are significant for the regulation of the phytoplankton community structure along the ECS coast.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105426"},"PeriodicalIF":2.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394356","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":"Bibliometric analysis of microplastics research: Advances and future directions (2020–2024)","authors":"Zhilin Xing ,&nbsp;Wenting Fu ,&nbsp;Liangjie Li ,&nbsp;Shan Wu","doi":"10.1016/j.csr.2024.105371","DOIUrl":"10.1016/j.csr.2024.105371","url":null,"abstract":"<div><div>Microplastics are a critical environmental concern due to their pervasive distribution and hazards. This study used Citespace software for a bibliometric analysis of microplastics research from 2020 to 2024, based on Web of Science papers. It covered sources, distribution, ecotoxicity, human health impacts, and mitigation measures. Findings showed a rapid increase in the number of related publications, with research focus gradually becoming more specialized, including advances in specific areas such as pollution status, ecotoxicology, detection technologies, and pollution control methods. Research focused on high plastic consumption regions like Europe, North America, and Asia, using innovative methods like high-throughput sequencing and nanotechnology. Keywords clustering identified primary research hotspots: microplastic pollution, ecotoxicity, pollution control, and human health impacts. Despite progress, challenges such as incomplete detection methods, the need for better risk assessment models, and improved pollution control technologies remain. This study offers insights and future research directions for microplastics pollution prevention and environmental protection.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105371"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145103","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":"Hydrogeochemical evaluation of Caleta de Los Loros Patagonian salt marsh in response to the geomorphological evolution of the coast during the Holocene","authors":"Eleonora Carol ,&nbsp;Rosario Acosta ,&nbsp;Guido Borzi ,&nbsp;María Paula Leal ,&nbsp;Mattia Gaiolini","doi":"10.1016/j.csr.2025.105403","DOIUrl":"10.1016/j.csr.2025.105403","url":null,"abstract":"<div><div>Sea level oscillations occurred during the Quaternary conditioned the marsh landscape by limiting the factors that regulate water salinity in this environment. The aim of this work was to evaluate geochemical processes that condition groundwater salinity in Caleta de Los Loros marsh considering geomorphological – climatic factors associated with the Holocene evolution of this Argentinean Patagonia coastal area. In this sense, a mapping and a geomorphological characterization was performed based on satellite images, digital elevation models and field surveys. A monitoring network including both surface and groundwater was made in order to measure <em>in situ</em> pH and electrical conductivity and to take samples to determine major ions and stable isotopes in the laboratory. The set of results obtained highlights that variations in salinity, major ions composition and isotopic signal recorded in the groundwater of Caleta de Los Loros marsh vary in the different sectors of the intertidal plains resulting from geomorphological evolution from the middle Holocene to the present day. The older intertidal deposits (2100 years B.P.) currently located in the more continental sector host high salinity environments with high marshes vegetated with <em>Salicornia</em> sp. The hydrochemical and isotopic signal indicates that in them salinity responds primarily to evaporitic salt dissolution – precipitation cycles. Meanwhile, more coastal intertidal deposits have less than 500 years and they host low marsh environments vegetated with <em>Spartina</em> sp. Hydrochemistry and isotopic composition in them reflect that tidal water flooding is the main water contribution to the system, being marsh groundwater hydrogeochemichally similar to surface water. Locally, contributions from adjacent beach ridges and hydrochemical variations associated with CO_2(g) dissolution were also recognized. Understanding environmental changes that occur in marshes as a product of their geomorphological quaternary evolution allows to understand the distribution of salinity patterns that develop in them and to give an idea of the time scale on which the salinization of these environments occurs.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105403"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145282","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":"Polycyclic aromatic hydrocarbons and their derivatives in sediments from the Okinawa Trough and South China Sea: Occurrence, sources, profiles, and implications for anthropogenic activities","authors":"Jin-Yun Li ,&nbsp;Ye-Yang Hou ,&nbsp;Wan-Jun Liao ,&nbsp;Ying Guo ,&nbsp;Yong He ,&nbsp;Liang-Ying Liu","doi":"10.1016/j.csr.2025.105406","DOIUrl":"10.1016/j.csr.2025.105406","url":null,"abstract":"<div><div>Sediments from the Middle Okinawa Trough (MOT) and Southwest Basin were analyzed for polycyclic aromatic hydrocarbons (PAHs) and their halogenated and nitrated derivatives. No halogenated PAHs were detected, whereas 6 nitrated PAHs were observed in three samples from the MOT (0.960−6.46 ng/g). The concentrations of Σ₁₈PAH in the sediment of the MOT (average124 ng/g) were statistically higher than those of the Southwest Basin (39.7 ng/g). The MOT sediments were dominated by 4−5-ring PAHs, whereas the Southwest Basin sediments were dominated by 3-ring PAHs. The regional differences in concentrations and composition profiles were likely due to the different patterns of regional environmental and/or anthropogenic factors, e.g., climate and energy consumption. Sedimentary PAHs in the MOT were primarily derived from petroleum and/or petroleum combustion, while those in the Southwest Basin were mainly from petroleum. The findings suggest that environmental management and pollution control strategies should consider the specific pollution source in different regions.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105406"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145288","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}