Journal of Sea Research最新文献

{"title":"Wave height measurement based on feature fusion extracted from marine radar images","authors":"Chengming Zong ,&nbsp;Zhizhong Lu ,&nbsp;Yanbo Wei","doi":"10.1016/j.seares.2025.102626","DOIUrl":"10.1016/j.seares.2025.102626","url":null,"abstract":"<div><div>Obtaining wave information near the ship's location is not only crucial for ensuring navigation safety, but also an important basis for meteorological forecasting and disaster prevention, which is of great significance for marine engineering and scientific research. To further improve the estimation accuracy of significant wave height (SWH) from non-coherent X-band marine radar image, a wave height measurement method is proposed based on the feature fusion and radial basis function (RBF) network. The wave slope and signal-to-noise ratio (SNR) extracted from radar image and environmental factors such as wave direction and wind information are introduced to establish the feature vector as the input of RBF network. By training the RBF network model, accurate estimation of SWH is achieved. The measured radar data is used for experimental verification, and the experimental results show that the feature fusion method proposed has higher accuracy and reliability in calculating SWH than the shadow statistical method and the traditional SNR-based method, when the environmental factor of wind information and wave direction is considered. The correlation coefficient between buoy record and estimated SWH approaches 0.92, and the root mean square error deceases to 0.21 m.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"208 ","pages":"Article 102626"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stratified community resilience and governance in a zero-Carbon Island: Evidence from Changdao, China","authors":"Hongwei Yu ,&nbsp;Youchao Xing ,&nbsp;Haolin Zhang ,&nbsp;Zijie Liu ,&nbsp;Yufeng Hou","doi":"10.1016/j.seares.2025.102645","DOIUrl":"10.1016/j.seares.2025.102645","url":null,"abstract":"<div><div>Coastal communities face compounding risks from climate change and intensive nearshore development. This study examines how resilience perceptions, green behaviors, and participatory governance are stratified across social groups in Changdao, an island in eastern China undergoing a comprehensive zero‑carbon transition integrating seagrass restoration with emerging blue carbon finance. Drawing on a 2025 stratified survey (<em>N</em> = 306) combined with interviews and policy analysis, we estimate multivariate models for resilience, green behavior, and participation to test four mechanisms: information accessibility, institutional trust, social capital, and ecological experience. Education and institutional trust emerge as the strongest predictors of perceived resilience, while direct ecological experience most consistently drives observed green behavior. Information exposure and group identity (resident versus non-resident) show weak or null effects unless coupled with credible governance and practical opportunities for engagement. Everyday participation remains rare, reflecting limited channels for meaningful involvement and material benefit, particularly among visitors and seasonal workers. These findings suggest that translating policy ambition into everyday practice requires transparent benefit-sharing, visible feedback on ecological outcomes, and institutionalized participation pathways tailored to both locals and migrants.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"208 ","pages":"Article 102645"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential application of otolith Sr:Ca ratios as indicators of brown-algae feeding histories in herbivorous fishes","authors":"Yoshimi Ogino ,&nbsp;Keisuke Furumitsu ,&nbsp;Takanari Kiriyama ,&nbsp;Atsuko Yamaguchi","doi":"10.1016/j.seares.2025.102633","DOIUrl":"10.1016/j.seares.2025.102633","url":null,"abstract":"<div><div>Brown algae (Phaeophyceae) are the largest and most ecologically important group of marine algae, serving as habitat-forming organisms shaping coastal ecosystems. Understanding the feeding pressure exerted by herbivorous fishes on brown algae is essential for elucidating the dynamics of both coral reefs and algal forests. This study focused on the unique ability of brown algae to accumulate strontium (Sr) and tested the hypothesis that frequent consumption of brown algae elevates otolith Sr:calcium (Ca) ratios in herbivorous fishes. We analysed stomach contents and otolith Sr:Ca ratios in four sympatric species collected in southwestern Japan. Among three <em>Kyphosus</em> species, higher Sr:Ca ratios were associated with the frequency of brown-algae consumption. Notably, <em>K. bigibbus</em>, a brown-algae specialist, exhibited an exceptionally high otolith Sr:Ca ratio (0.12), far exceeding the common range of marine fishes (0.004–0.02). In <em>K. vaigiensis</em>, Sr:Ca ratios were high in areas where brown algae were frequently consumed, whereas they were moderate in areas where red algae were predominantly consumed. In <em>K. cinerascens</em>, only the latter pattern was observed. Both patterns are consistent with our hypothesis. Furthermore, the results suggest that <em>K. bigibbus</em> begin feeding on brown algae at approximately 1 year of age. By contrast, <em>Siganus fuscescens</em> exhibited Sr:Ca ratios within the common range, despite frequent feeding on brown algae, deviating from this hypothesis. Therefore, otolith Sr:Ca ratios may serve as a species-specific proxy for reconstructing feeding histories on brown algae, providing a novel tool for investigating herbivory over several decades in long-lived species.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"208 ","pages":"Article 102633"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seabed topography of a deep-water channel and nearby abyssal mount area south of the Azores, Eastern North Atlantic: Evidence of tectonic activity, erosion, and bottom current action","authors":"Henk de Haas ,&nbsp;Veit Hühnerbach ,&nbsp;Martin Laungaard ,&nbsp;Carsten Skaarup ,&nbsp;Antoon Kuijpers","doi":"10.1016/j.seares.2025.102642","DOIUrl":"10.1016/j.seares.2025.102642","url":null,"abstract":"<div><div>Detailed multibeam bathymetric mapping in combination with 3.5 kHz sub-bottom profiling, seabed video observations, sediment coring and hydrographic (CTD) measurements were performed in a deep-water area south of the Azores, Eastern North Atlantic Ocean. The study site is located immediately north of an UN-designated large marine protection area including the Atlantis-Meteor Seamount Complex. This seamount area represents a deep-sea benthic environment characterized by a vulnerable marine ecosystem with a large, partly unknown, biodiversity. Spatial distribution of deep-sea biodiversity is mainly driven by seabed topography and bottom water conditions, which are the main topics addressed in the present study. The seabed data collected during two cruises with RV’Pelagia’ (Royal NIOZ) provides evidence of significant (retrogressive) erosion patterns and local tectonic activity. A variety of larger and smaller erosional and sedimentary structures and the limited distribution of fine-grained bedded sediments are interpreted to have resulted from a combination of local hydrodynamic processes and tectonic activity. This new seabed information acquired in our study will thus contribute to a better understanding of the role of (near) seabed dynamics and topography in controlling deep-water biodiversity south of the Azores.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"208 ","pages":"Article 102642"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145466398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimized cleaning and centrifugation of Japanese precious corals for enhanced sclerite classification and chemical profiling","authors":"Beatrice Coda ,&nbsp;Asami Suzuki Mashio ,&nbsp;Tenyu Tamura ,&nbsp;Aya Mamorita ,&nbsp;Kuo Hong Wong ,&nbsp;Nozomu Iwasaki ,&nbsp;Hiroshi Hasegawa","doi":"10.1016/j.seares.2025.102639","DOIUrl":"10.1016/j.seares.2025.102639","url":null,"abstract":"<div><div>The phylum Cnidaria is a vast taxonomic group that includes corals, sea anemones, and jellyfish. This study focuses on corals within the class Octocorallia, order Scleralcyonacea, and family Coralliidae, specifically <em>Corallium japonicum</em> and <em>Pleurocorallium konojoi</em>, which are of ecological and scientific significance in Japan. We evaluated cleaning protocols using sodium hypochlorite and sodium hydroxide to remove organic matter from the biomineralized structures of coral species. The objective was to improve structural integrity preservation, to enable more accurate chemical and structural analyses and contribute to coral restoration efforts. Our findings demonstrated that the most effective cleaning approach for the axial skeleton was the use of 0.4 M sodium hypochlorite (NaClO) solution, immersing the skeleton for 100 min at room temperature (approximately 20 °C). Meanwhile, for the sclerites, the experimental results indicated that the preferred cleaning technique was the use of either 0.1 M or 0.2 M sodium hypochlorite (NaClO) solution for 100 min at room temperature (approximately 20 °C). Additionally, centrifugation of the precious coral sclerites resulted in the clear separation of red and white sclerites. Lastly, we performed chemical analyses on both the skeletons and the sclerites, utilizing ICP-MS and ICP-AES technologies to gain an overview on the concentrations of the major and minor chemical elements that were present in both structures.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"208 ","pages":"Article 102639"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145466463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 EMSO-Azores deep-sea observatory: 15 years of multidisciplinary studies of the lucky strike hydrothermal system, from sub-seafloor to the water column","authors":"M. Matabos ,&nbsp;M. Cannat ,&nbsp;V. Ballu ,&nbsp;T. Barreyre ,&nbsp;J. Blandin ,&nbsp;A. Castillo ,&nbsp;C. Cathalot ,&nbsp;V. Chavagnac ,&nbsp;N.C. Chu ,&nbsp;A. Colaço ,&nbsp;W. Crawford ,&nbsp;J. Escartin ,&nbsp;B. Ferron ,&nbsp;F. Fontaine ,&nbsp;L. Gautier ,&nbsp;A. Godfroy ,&nbsp;A. Laes-Huon ,&nbsp;N. Lanteri ,&nbsp;H. Leau ,&nbsp;J. Legrand ,&nbsp;P.M. Sarradin","doi":"10.1016/j.seares.2025.102625","DOIUrl":"10.1016/j.seares.2025.102625","url":null,"abstract":"<div><div>Faced with climate change and the increasing interest for the deep ocean and ocean resources exploitation in particular, there is an urgent need for more comprehensive studies of deep-sea ecosystems. Hydrothermal vents are key areas for thermo-chemical exchanges between the lithosphere and hydrosphere and host unique biodiversity. Since 2010, the EMSO-Azores observatory has maintained arrays of multidisciplinary sensors at the Lucky Strike Hydrothermal Field (LSHF; 1700 m water depth), on the slow spreading mid-Atlantic ridge. This infrastructure, combined with repeated yearly sampling during the MoMARSAT maintenance cruises, aims at understanding the feedbacks between tectonics, volcanism and hydrothermal circulation, the coupling between these processes and the hydrothermal ecosystem, and their impacts on the water column. In this review, we summarize 15 years of integrated and multidisciplinary study at LSHF and discuss the societal relevance of this observatory. Hydrothermal circulation is strongly constrained by crust permeability and the availability of magmatic heat. Its variability accounts for the spatial heterogeneity of chemical fluxes and biological communities observed. Tidal modulation of seafloor pressure and near seafloor currents impact venting temperatures, species behaviour, and their physiology. Tidal currents also influence plume dynamics and facilitate particle export to the ocean. At pluri-annual scales, geological events (faulting, seismicity, and magmatic replenishment) have led to changes in fluid chemistry, impacting local microbial communities. However, results obtained over the 15 years of monitoring point to a relative stability of the overall vent system, challenging the idea that hydrothermal vents communities are highly dynamic and ephemeral habitats at decadal timescales.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"207 ","pages":"Article 102625"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical mechanisms behind the interhemispheric teleconnection between South Pacific Meridional Mode and Bohai, Yellow and East China Seas during boreal summers of 2001–2019","authors":"Guandong Gao ,&nbsp;Ming Feng ,&nbsp;Lin Wang ,&nbsp;Zhaoxuan Yang ,&nbsp;Xingru Feng ,&nbsp;Baoshu Yin","doi":"10.1016/j.seares.2025.102621","DOIUrl":"10.1016/j.seares.2025.102621","url":null,"abstract":"<div><div>The emergence of SPMM (South Pacific Meridional Mode)-BYECS (Bohai, Yellow and East China Seas) interhemispheric teleconnection after the early 2000s contributed to extreme marine heatwaves in the BYECS, yet the underlying physical mechanism remains poorly understood. We examined this teleconnection comprehensively, utilizing observational data from multiple sources, and proposed a physical mechanism involving SPMM-ITCZ (Intertropical Convergence Zone)-WPSH (western Pacific subtropical high) variabilities. The weakened ITCZ associated with a positive SPMM resulted in a weakened sinking branch to the north, consequently increasing convection and precipitation in the western Pacific (150–180°E; 9–27°N). This weakened the WPSH by stimulating a cyclonic anomaly, which promoted moisture transport and precipitation on the eastern edge, establishing positive feedback. At the western edge of this cyclonic anomaly, strong northerly wind anomalies reduced moisture replenishment and caused descending anomalies over the eastern part of BYECS. High-pressure anomalies on the western side of the northerly wind anomalies also resulted in descending anomalies over the BYECS. The inhibited upward motion and moisture replenishment jointly led to reduced cloud cover and increased shortwave radiation, thereby increasing BYECS sea surface temperature anomalies (SSTa) alongside SPMM-SSTa. This study proposed new physical mechanisms regarding with SPMM-ITCZ-WPSH interhemispheric teleconnection which is crucial to climate prediction in marginal seas.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"207 ","pages":"Article 102621"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Possible evidence of range expansion of the tropical ghost crab Ocypode ceratophthalmus to a temperate region driven by climate change","authors":"Dain Kim ,&nbsp;Sook-Jin Jang ,&nbsp;Taewon Kim","doi":"10.1016/j.seares.2025.102623","DOIUrl":"10.1016/j.seares.2025.102623","url":null,"abstract":"<div><div>Recent rapid climate change caused by global warming has significantly affected marine organisms, and species normally found in tropical zone have been reported in temperate zones. This cryptic range expansion may influence ecosystems due to interspecific competition for habitats, prey, and population reproductive resources with native species. In September 2021 and August 2022, we identified the tropical ghost crab species <em>Ocypode ceratophthalmus</em> in the southern region of the Korean Peninsula. To date, only three species of ghost crabs, <em>O. stimpsoni</em>, <em>O. cordimana</em>, and <em>O. sinensis</em>, had been reported. Morphologically, all specimens of <em>O. ceratophthalmus</em> possess a stridulating ridge composed of two parts of circular and horizontal lines but lack prolonged eyestalks. Species identification was confirmed using a partial sequence of the mitochondrial cytochrome <em>c</em> oxidase subunit I (<em>mtCO1</em>) gene for each individual given their morphological immaturity. Additionally, population genetic analyses using the <em>mtCO1</em> and nuclear sodium‐potassium ATPase α-subunit (<em>NaK</em> intron) genes revealed the high genetic connectivity between Korean populations and the neighboring populations in Northeast Asia. The results of the neutrality test and mismatch distribution indicated that the Jeju population in South Korea experienced a recent population expansion. Given the oceanic flow of the Kuroshio Current and the smaller currents branching off, the genetic homogeneity of populations is anticipated to be a result of continuous immigration of individuals from more southern localities. These findings provide pivotal insights into the habitat expansion of the tropical crabs into temperate zones. Additionally, they inform conservation strategies for native crabs by enabling effect-based estimation of species range expansion and settlement.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"207 ","pages":"Article 102623"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-disaggregated landings of Pama croaker (Otolithoides pama) at a fish collection station in the Gulf of Mottama, Myanmar: An eight-year analysis","authors":"Zun Pyae Oo ,&nbsp;Bo Sann ,&nbsp;Kenneth T. MacKay ,&nbsp;Kyaw Thu Aung","doi":"10.1016/j.seares.2025.102610","DOIUrl":"10.1016/j.seares.2025.102610","url":null,"abstract":"<div><div>Small-scale fisheries play a crucial role in sustaining coastal communities, yet they face significant challenges due to illegal fishing and a lack of comprehensive data for effective management. This study presents an eight-year analysis (2016–2023) of landings of Pama croaker (<em>Otolithoides pama</em>), a key economic species for local livelihoods in the Gulf of Mottama, Myanmar. Using size-disaggregated data from a fish collection station operated by Mawlamyine Holding Limited, we assessed changes in population structure, seasonal landing patterns, and economic contributions. Total landings increased from 25,930 kg in 2016 to 139,618 kg in 2023; however, the number of individuals declined, indicating a shift toward the capture of larger fish, likely recruiting from earlier juvenile stages (size categories 1 and 2). Analysis of size composition further revealed a decline in juvenile recruitment in recent years. Time-series analysis showed bimodal landing peaks in June–July and December–January, likely influenced by monsoonal inputs and spawning migrations. Economic valuation estimated annual gross income per fisher between USD 1732 and USD 5692, with total fishery value reaching approximately USD 10 million annually across the Gulf. Although fisheries co-management efforts played a crucial role in increasing fish landings from 2017 through 2023, recent political instability and weakened enforcement have posed a threat to long-term sustainability, enabling the resurgence of destructive fishing practices. Our findings underscore the importance of strengthening co-management systems and restore enforcement patrols to ensure the resilience of Pama croaker stocks and the livelihoods of coastal fishing communities.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"207 ","pages":"Article 102610"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eutrophication-driven biogeochemical processes influencing dissolved organic matter dynamics in a tropical coastal bay: Insights from Lianzhou Bay, northwestern South China Sea","authors":"Siyi Xu ,&nbsp;Ye Xu ,&nbsp;Xin Wang ,&nbsp;Renming Jia ,&nbsp;Qizhong Su ,&nbsp;Chao Wang","doi":"10.1016/j.seares.2025.102616","DOIUrl":"10.1016/j.seares.2025.102616","url":null,"abstract":"<div><div>The global understanding of coastal carbon cycling is increasingly recognising the disproportionate importance of small estuary-coastal bay systems. This study analysed dissolved organic carbon (DOC) and nitrogen (DON), coloured and fluorescent dissolved organic matter (DOM, CDOM and FDOM), along with environmental parameters in Lianzhou Bay, northwestern South China Sea, during summer 2022. A two-endmember mixing model was applied to quantify the non-conservative (Δ) dissolved inorganic nitrogen (DIN), phosphorus (SRP), and DOM. DIN decreased linearly with salinity, suggesting conservative mixing, while SRP showed no salinity dependence and was elevated nearshore, suggesting anthropogenic inputs. Non-conservative additions of DOC (44 %), CDOM (31–44 %), and protein-like FDOM (FDOM_P, 46 %) were accompanied by substantial DON removal (−83 %). ΔDOC and ΔCDOM were negatively correlated with chlorophyll-a, suggesting their origin from the early microbial transformation of phytoplankton-derived particles. Conversely, the positive correlation between ΔDON and chlorophyll-a, together with a negative ΔDON–ΔDIN correlation of differing magnitudes, suggests partial microbial utilisation of N-rich compounds, with nitrogen not fully retained as DIN. Regionally, CDOM accumulated in the middle bay with minimal ΔDOC, driven by microbial processing of biogenic particles; the southern bay showed zero ΔDOC but positive ΔFDOM_P, suggesting coupled production and degradation; in the north, excess primary production led to DOC buildup and DON removal, with labile DOM actively utilized. Among Chinese bays, the relatively low FDOM_P proportion in Lianzhou Bay, despite high DOM levels, reflects limited direct anthropogenic inputs and substantial microbial humification, highlighting the complex interplay of natural and human-driven processes shaping coastal DOM composition.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"207 ","pages":"Article 102616"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}