Estuarine Coastal and Shelf Science最新文献

{"title":"Influence of algal drift and morphodynamic conditions on the fish assemblages and feeding guilds in ocean-exposed tropical beaches","authors":"Alexandre da Gama Fernandes Vieira-Júnior ,&nbsp;Breno Silva Macário ,&nbsp;Steven J. Presley ,&nbsp;Michael R. Willig ,&nbsp;André Luiz Machado Pessanha","doi":"10.1016/j.ecss.2025.109321","DOIUrl":"10.1016/j.ecss.2025.109321","url":null,"abstract":"<div><div>The surf zones of sandy beaches are habitats in which morphodynamic characteristics (e.g., tide-modified versus wave-dominated beaches) influence the distribution of fish species. In addition, algal drift from adjacent coastal ecosystems (allochthonous material) is an important source of spatial heterogeneity within sandy beach habitats, providing refuge and food resources for fish species. We evaluated the influence of algal drift on the abundance, richness, and biomass of fish assemblages and feeding guilds (i.e. zooplanktivores, piscivores, opportunists and benthivores) on beaches with different exposures to wave conditions. For the entire fish fauna, abundance and species richness, but not biomass, differed between beach exposures. Similarly, abundance and biomass, but not richness of zooplanktivorous fish differed between tide-modified and wave-dominated beaches. In contrast, abundance, but not richness or biomass of benthivorous fish differed among categories of algal volume, while morphodynamic characteristics had no main or interactive effects. Finally, morphodynamic characteristics interacted with differences among categories of algal volume to affect species richness but not abundance or biomass of fish in the opportunist's guild. The size of individuals in the entire fish fauna and in the opportunists guild was affected by beach type and algae volume, whereas in the zooplanktivorous guild size was only affected by algal volume. The size of fish in the benthivorous guild was not affected by algal volume in tide-modified beaches. The responses of fish to morphodynamic conditions and algal drift were guild-specific, suggesting that different strategies may need to be implemented for the conservation or management of these trophic groups.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109321"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887174","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":"Non-linear tide-surge interactions around the coast of the UK through the lens of tidal level, phase, and skew surge","authors":"Luke J. Jenkins ,&nbsp;Ivan D. Haigh ,&nbsp;Dafni E. Sifnioti ,&nbsp;Jose Alejandro Pinto Rascon ,&nbsp;Addina Inayatillah ,&nbsp;Hachem Kassem","doi":"10.1016/j.ecss.2025.109323","DOIUrl":"10.1016/j.ecss.2025.109323","url":null,"abstract":"<div><div>Coastal flooding, driven by extreme sea levels, is a significant threat to the coastline of the United Kingdom. The primary contribution to extreme sea levels is the combination of tide and surge and understanding how these components interact is critical to assessing extreme sea levels at the coast. Here, we analyse the interactions of skew surge and tidal high water, non-tidal residual and tidal phase, and non-tidal residual and tidal level using the entire observational tide gauge network of the UK, a near 500-year model, and a model run of 2013/14 with an artificially adjusted forcing to examine how storm arrival time impacts these interactions. We show that the levels of tide-surge interaction at most sites are relatively insensitive to the magnitude of the extreme value threshold and the declustering window size. Measured data show greater levels of interaction than modelled data and although there is little interaction between skew surge and tidal high water, there are sizeable tide-surge interactions between the non-tidal residual and the astronomical tide, the largest being for tidal phase. Around the UK, extreme non-tidal residuals generally occur favourably between 1 and 5 h before tidal high water and at tidal levels that are at, or below, the average tidal level. When storm arrival time is artificially shifted, the overall change in interaction around the UK is relatively small, with skew surge and non-tidal residual maxima occurring at similar respective tidal high waters, tidal phases, and tidal levels, although variation is seen on smaller spatial scales. Our findings advance the understanding of non-linear tide-surge interactions around the UK, which is essential for the accurate estimation of extreme sea level probabilities and thus the defence of the coastline against coastal flooding.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109323"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936875","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":"Munitions mobility and burial in a microtidal estuary","authors":"Agnese Baldoni ,&nbsp;Carlo Lorenzoni ,&nbsp;Allison M. Penko ,&nbsp;Matteo Postacchini ,&nbsp;Lorenzo Melito ,&nbsp;David Scaradozzi ,&nbsp;Maurizio Brocchini","doi":"10.1016/j.ecss.2025.109297","DOIUrl":"10.1016/j.ecss.2025.109297","url":null,"abstract":"<div><div>Field tests were performed to observe mobility and burial of underwater unexploded ordnances (UXOs) in a microtidal estuary, characterized by multiple forcings and mixed sediments. Such characteristics distinguish the site from others usually studied in the literature, making the analysis very complex. Observations highlighted the large dependence of UXO behavior on the bed sediments. UXOs placed on the muddy riverbed got buried almost instantaneously, without moving. Just the smallest and least dense UXO experienced some migration (maximum 10 m) and re-exposure episodes. On the other hand, UXOs remained proud on the sandy seabed, until a wave storm produced bed fluidization that caused their complete burial. Field observations, together with data collected by an integrated monitoring system operating in the study area, provided a baseline dataset for the validation of predictive models of UXO motion. The Underwater Munitions Expert System (UnMES), forced with Delft3D hydro-morphodynamic results, was run to simulate the behavior of light, medium, and heavy UXO types during a sea storm. Results agreed well with observations, predicting complete burial and minimal migration (0–5 m).</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109297"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895248","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":"A novel control volume methodology to constrain ecosystem nutrient cycling within a tidal freshwater river","authors":"D.R. Mackenzie ,&nbsp;D.R. Tait ,&nbsp;J. Sippo ,&nbsp;A. Ferguson ,&nbsp;Rao S ,&nbsp;C. Ralph ,&nbsp;B. Stewart ,&nbsp;M. Call ,&nbsp;M. Reading ,&nbsp;M. Andskog ,&nbsp;D. Laicher-Edwards ,&nbsp;D.T. Maher","doi":"10.1016/j.ecss.2025.109320","DOIUrl":"10.1016/j.ecss.2025.109320","url":null,"abstract":"<div><div>Tidal freshwater systems are dynamic biogeochemical hotspots that play a crucial role in nutrient cycling and the attenuation of catchment derived material. Traditional biogeochemical analysis typically relies on estimation techniques such as interpolation, regression, and remote sensing based on limited data sets, which can result in significant uncertainties. This study applies a novel sampling approach to a tidal freshwater system located on the far northeast coast of New South Wales, Australia, to quantify nutrient fluxes within a “control volume” (CV) by combining high-resolution discrete time series and hydrodynamic measurements in combination with a traditional benthic flux methodology. The study found high NH₄ consumption and high NO_x production reflective of nitrification within the aerobic water column. The total oxygen demand within the control volume was very close to the aggregate of the sediment oxygen demand and nitrification oxygen demand, highlighting the importance of sediment biogeochemical processes within the TFZ. Control volume NOx consumption and P release were orders of magnitude larger than those obtained from traditional sediment core incubations, suggesting that NOx and P dynamics in the Richmond River TFZ are driven by processes other than sediment dynamics and/or sediment incubations underestimated in situ fluxes.</div><div>The novel control volume methodology offers a high-resolution sampling technique with fewer sampling artifacts and an enhanced understanding of biogeochemical trends over the tidal and diel cycles. By integrating biogeochemical measurements with hydrodynamic processes, this method effectively constrain nutrient cycling within a defined reach, providing detailed insights into nutrient processing during the measurement period.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109320"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874114","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":"Emerging trade-offs in saltmarsh ecosystem services under sea-level rise","authors":"Victoria G. Mason ,&nbsp;Pim W.J.M. Willemsen ,&nbsp;Rosemary O. Adams ,&nbsp;Bas W. Borsje ,&nbsp;Gregory S. Fivash ,&nbsp;Johan van de Koppel ,&nbsp;Marte M. Stoorvogel ,&nbsp;Tjeerd J. Bouma","doi":"10.1016/j.ecss.2025.109319","DOIUrl":"10.1016/j.ecss.2025.109319","url":null,"abstract":"<div><div>Coastal defence and carbon storage by coastal wetlands provide an increasingly recognised means of adaptation and mitigation in the face of climate change, yet these same services are threatened by the impacts against which they protect. Our understanding to date tends to consider impacts of rising sea levels on individual marsh services but fails to consider trade-offs and potential interactions between them. For instance, sea-level rise has the potential to enhance carbon storage but may decrease soil stability, erosion resistance and wave-attenuation capacity by creating sub-optimal growth conditions, causing plants to be weaker and smaller. As such, we aim to answer the question: will rising sea levels drive unidirectional impacts, or contrasting ‘trade-offs’, between saltmarsh carbon storage and coastal defence? We conducted a field experiment across increasing inundation durations beyond the usual seaward limit of <em>Spartina anglica</em> growth, mimicking SLR at established vegetation patches, and measured (1) carbon decomposition rates using the teabag index as proxy, (2) sediment stability, and (3) biomechanical traits of <em>S.anglica</em> as proxy for wave-attenuation capacity. With increasing inundation duration, rates of carbon decomposition slowed, supporting carbon storage, and therefore positively impacted climate change mitigation. In contrast, both sediment stability and vegetation stiffness decreased and hence negatively impacted climate change adaptation. Our findings point to a short-term trade-off in climate ecosystem services with SLR, where positive impacts on carbon storage may offset negative impacts on coastal defence services. However, since lower sediment stability increases the chance of marsh erosion under extreme events, this will increase over time the likelihood of sediment resuspension and the ultimate rerelease of previously stored carbon into the marine carbon cycle. Thus, the interaction between ecosystem services may lead to a net negative impact of SLR on climate mitigation services. Overall, we highlight the necessity of taking a multi-service approach to considering the impact of global change effects on ecosystem services.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109319"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868131","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":"Conditions for vegetative propagation of three key halophytes from habitats of EU community interest: substrate nature, salinity and PGP-bacterial interactions and cost evaluation","authors":"Pedro Valle-Romero ,&nbsp;M. Rocío Martín-Peláez ,&nbsp;Noris J. Flores-Duarte ,&nbsp;Susana Redondo-Gómez ,&nbsp;Giacomo Puglielli ,&nbsp;María Zunzunegui ,&nbsp;Leonor Álvarez-Cansino ,&nbsp;Ignacio D. Rodríguez-Llorente ,&nbsp;Eloísa Pajuelo ,&nbsp;Enrique Mateos-Naranjo","doi":"10.1016/j.ecss.2025.109315","DOIUrl":"10.1016/j.ecss.2025.109315","url":null,"abstract":"<div><div>The ecological transition faces the challenge of expanding wetland restoration areas due to their critical role in ecosystem service provision. To improve restoration efforts, particularly in plant material production for revegetation, scientific knowledge is essential. This study focuses on establishing optimal vegetative propagation protocols for three slow-growing, perennial halophyte species from EU habitats of interest: <em>Atriplex portulacoides</em>, <em>Arthrocaulon macrostachyum</em> and <em>Sporobolus maritimus</em>. Cuttings were grown in three substrates (perlite, coconut fiber and mulch) with two salinity levels (0 and 171 mM NaCl) and three inoculation treatments (non-inoculated and inoculated with two plant growth-promoting (PGP) rhizobacteria consortia). Cuttings survival rate was species-specific, with <em>A. portulacoides</em> showing the highest survival range (78.75 ± 18.75) compared to the ranges observed for <em>A. macrostachyum</em> and <em>S. maritimus</em> (57.50 ± 12.50 % and 59.60 ± 9.00 %, respectively). Plants grown with coconut fiber performed best survival rate, followed by perlite independently of inoculation. Moreover, survival rates of <em>S. maritimus</em> were also enhanced by PGP inoculation. Similar patterns were observed for cutting development: cuttings grown in perlite, followed by coconut fiber, and exposed to high salinity showed higher above- and belowground biomass. By selecting this <em>Substrate</em> and <em>Salinity</em>, <em>Inoculum</em> had a positive effect on the development of <em>A. portulacoides</em> and <em>A. macrostachyum</em>. Furthermore, inoculated plants showed overall higher values of photosynthetic efficiency and carboxylation. Finally, a cost analysis comparing our approach to using direct transplant material indicates significant economic advantages. Our results provide compelling evidence to enhance nursery stock for future revegetation projects.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109315"},"PeriodicalIF":2.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842614","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":"Bottom-up regulation of food webs in a high-latitude environment depends on season and habitat type","authors":"Neus Campanyà-Llovet ,&nbsp;Paul V.R. Snelgrove","doi":"10.1016/j.ecss.2025.109314","DOIUrl":"10.1016/j.ecss.2025.109314","url":null,"abstract":"<div><div>Food source and quality influence benthic trophic pathways and health status of scavengers at high latitudes. We hypothesised that benthic responses to food sources differing in nutritional value vary across habitats and seasons. We therefore deployed Baited Remote Underwater Video systems with four different types of bait in coastal waters (≤20 m) of the Nain Archipelago (Labrador, Canada). Strong seasonality and a variety of habitat types (e.g., mud and rhodolith beds) characterize this high latitude environment. We deployed an <em>in situ</em> feeding experiment in those habitats during the ice-covered spring and ice-free fall. We selected bait commonly found in the region that fluctuates according to environmental conditions and biotic interactions: herring (<em>Clupea harengus</em>), lion's mane jellyfish (<em>Cyanea capillata</em>), kelp (<em>Laminaria</em> sp.), and crab (<em>Chionoecetes opilio</em>). We deployed herring and kelp in both seasons but the absence of lion's mane in spring only allowed for fall deployments, and we therefore used the crab treatment in spring instead. We observed significantly lower feeding activity in the spring compared to the fall deployments regardless of bait type. The highly structural rhodolith beds supported higher feeding activity than any other habitat and more diverse species composition than the flat muddy habitat. In all habitats, the number of visitors feeding on the fish treatment was significantly higher than to the lion's mane, likely reflecting its higher nutritional value. Species composition between treatments differed significantly, where toad crab <em>Hyas</em> spp. and whelk <em>Buccinum undatum</em> dominated the fish treatment. Only one species consumed kelp and crab treatments, sea urchin <em>Strongylocentrotus droebachiensis</em> and whelk, respectively. Overall, season tempered the intensity of scavenger initial response to a food fall deployments whereas habitat and treatment regulated key players and intensity. Bottom-up effects on benthic scavengers therefore depend on season, habitat, and food source.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109314"},"PeriodicalIF":2.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890601","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":"Observations and modeling of the 2021 deep-water renewal event in Masfjorden, a sill fjord in Western Norway","authors":"Torunn S. Sagen ,&nbsp;Lars Asplin ,&nbsp;Elin Darelius ,&nbsp;Ingrid A. Johnsen ,&nbsp;Mari S. Myksvoll","doi":"10.1016/j.ecss.2025.109287","DOIUrl":"10.1016/j.ecss.2025.109287","url":null,"abstract":"<div><div>Deep-water renewal (DWR) is an important process in sill fjords, as it brings oxygen-rich water to the greater depths of the isolated fjord basin. In Masfjorden, a sill fjord in Western Norway, the first full DWR event in 11 years was observed in April 2021. Prior to the DWR event, near-hypoxic conditions were observed close to the bottom of the basin. Two high-density episodes at the sill and water intrusions in the fjord basin were identified from mooring records, showing that the DWR event took place following northerly winds sufficiently strong for coastal upwelling to lift dense water up to sill level. The observations were used to evaluate a high-resolution regional model’s performance regarding deep-water renewal in a fjord basin. The regional model showed the development of coastal upwelling leading up to a high-density episode at the sill, which coincided with the observed high-density episode.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109287"},"PeriodicalIF":2.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868130","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":"A novel zooplankton-based environmental monitoring tool for coastal impacted areas: The case of the Doce River dam rupture","authors":"Gustavo Martins Rocha ,&nbsp;Bianca Salvador ,&nbsp;Gabriel Harley Costa Santos ,&nbsp;Laura Rodrigues da Conceição ,&nbsp;Priscila Teixeira-Amaral ,&nbsp;Maikon Di Domenico ,&nbsp;Diego de Arruda Xavier ,&nbsp;Eduardo Schettini Costa ,&nbsp;Renata Caiado Cagnin ,&nbsp;Cesar Alexandro da Silva ,&nbsp;Mayara Bandeira ,&nbsp;Mônica de Souza Mendes ,&nbsp;Gabriela Corrêa Brasileiro ,&nbsp;Júlia Tavares Salviato ,&nbsp;Tayná Rosa Martins Paiva ,&nbsp;Georgette Cristina Salvador Lázaro ,&nbsp;Márcio Murilo Barboza Tenório ,&nbsp;Kassia Nascimento Lemos ,&nbsp;Renato David Ghisolfi ,&nbsp;Daniel Rigo ,&nbsp;Luiz Fernando Loureiro Fernandes","doi":"10.1016/j.ecss.2025.109301","DOIUrl":"10.1016/j.ecss.2025.109301","url":null,"abstract":"<div><div>Zooplankton monitoring has been carried out in the Doce River region since 2015, when the Fundão mine dam ruptured and its tailings reached the coast. It is considered the biggest environmental disaster in Brazilian history. Here, we present an update on the zooplankton community scenario and introduce the novel Prevalence of Bioindicator Groups (PBG) index. It uses bioindicator taxa (<em>Paracalanus</em> cf <em>parvus</em> and <em>Oikopleura</em> spp) to assess inorganic pollution in the water. We measured salinity, temperature, river flow and wave energy and sampled quarterly for metal(loid) elements, suspended particulate matter, organic matter, and chlorophyll-<em>a</em> concentrations in the water along with zooplankton vertical sampling. Shannon diversity and Pielou evenness indexes were negatively correlated with the Doce River flow. They reached the lowest mean values during the three first wet periods of January 2019, 2020, and 2021, with significantly different values from the dry periods. PBG variation was better explained by concentrations of Cr, Co, Ni, Cu and Pb and by the percentage of organic matter. An apparent improvement in the zooplankton community was detected based on diversity, evenness and PBG values comparing the first years of monitoring (first to third) with the last years (fourth and fifth), which could be linked to the reduction of metal bioavailability in the water. It is still unclear whether this improvement represents a linear trend or a fluctuation caused by extreme local oceanographic events. Either way, PBG indicate that the environment is still far from recovering to its pre-dam rupture status and proven to be useful as a complementary tool for metal(loid) impact monitoring.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109301"},"PeriodicalIF":2.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852283","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":"Seafloor temperature variability in the Zhoushan Archipelago: Patterns and mechanisms","authors":"Qiying Wang ,&nbsp;Peng Bai ,&nbsp;Jingling Yang ,&nbsp;Peiliang Li ,&nbsp;Chengcheng Yu ,&nbsp;Qiong Wu ,&nbsp;Zhenxin Ruan ,&nbsp;Bo Li","doi":"10.1016/j.ecss.2025.109298","DOIUrl":"10.1016/j.ecss.2025.109298","url":null,"abstract":"<div><div>Sea water temperature is one of the most critical environmental parameters for characterizing and regulating marine biogeochemical processes. Due to limited observational data, past researches have primarily focused on water temperature in the upper ocean, with relatively little attention given to the spatiotemporal evolution and modulation mechanisms of seafloor temperature (SFT). Utilizing continuous, high-frequency in situ SFT data collected by submarine cable observation systems at four stations (Dongji 1, Dongji 2, Dajishan, and Zhairuoshan) in the Zhoushan Archipelago area (ZA) from October 2020 to December 2021, we examined the patterns and regulatory mechanisms of SFT variability within this region. Results show that at the Dongji 1, Dongji 2, and Dajishan stations, the diurnal standard deviation (STD) of SFT exhibits a remarkable seasonal pattern, being higher in winter and summer, and lower in spring and autumn, at the same time, SFT displays significant semi-diurnal and diurnal periodic signals during winter and summer, which nearly disappear in spring and autumn; at the Zhairuoshan station, periodic variations in SFT are minimal throughout the year. Further analyses of multi-source sea temperature data and results from Lagrangian particle tracking point out that the diurnal STD of SFT at Dongji 1, Dongji 2, and Dajishan stations is mainly dominated by the distinct sea temperature background and water exchange between the ZA and adjacent water: due to strong tidal mixing and shallow topography, the ZA, Hangzhou Bay and along with the southern regions of the Yangtze River Estuary exhibits weak stratification throughout the year. In winter, under the control of tidal currents and the southward Zhejiang-Fujian Coastal Current (ZFCC), daily water exchange in ZA primarily with the colder waters originating from Hangzhou Bay and the southern Yangtze River Estuary. While during summer, the ZA is occupied by cold upwelling, and dominated by tidal currents and the northward ZFCC, thus ZA mainly exchange with warmer waters from Hangzhou Bay and the southeastern side of the archipelago within a day. Therefore, this seasonal variation results in larger diurnal STDs of SFT in winter and summer. In contrast, during the monsoon transition period of spring and autumn, the horizontal and vertical distribution of sea temperature across the ZA and its adjacent water is generally uniform, leading to smaller diurnal STD of SFT. The relatively enclosed hydrological environment of Zhairuoshan station leads to limited daily water exchange, resulting in consistently weak diurnal STD of SFT year-round.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109298"},"PeriodicalIF":2.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829552","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}