Pub Date : 2024-11-16DOI: 10.1016/j.marpolbul.2024.117267
Jin Young Choi , Jae Seong Lee , Kyung-Tae Kim , Geun-Ha Park , Jun-Mo Jung , Gi Hoon Hong , Kongtae Ra , Sangmin Hyun , Chang Eon Lee , Eun-Ji Won
This study investigated the spatial distribution and chemical characteristics of potentially toxic elements (PTEs) in road-deposited sediments (RDS) at the Port of Busan by size fraction. Enrichment factor (EF) values for Zn, Cd, and Sb in fine RDS <250 μm were 52–69, 49–78, and 46–44, respectively, indicating ‘extremely high enrichment’. Various statistical analyses, including PCA and PMF models, revealed a strong correlation between pollution levels in RDS <250 μm and vehicle type, identifying non-exhaust emissions (NEE) of vehicles as a primary source of PTEs in RDS from the port. The risk index (RI) value of fine RDS ranged from 649 to 2238, indicating that the entire study area could be classified as having a ‘significant ecological risk,’ with higher values observed in heavy-duty vehicles (HDV) areas. The study underscores the need for effective NEE management to mitigate the environmental impact of ports on marine ecosystems.
{"title":"Characteristics and sources of potentially toxic elements in road-deposited sediments at the Port of Busan, South Korea: A key contributor to port sediments pollution","authors":"Jin Young Choi , Jae Seong Lee , Kyung-Tae Kim , Geun-Ha Park , Jun-Mo Jung , Gi Hoon Hong , Kongtae Ra , Sangmin Hyun , Chang Eon Lee , Eun-Ji Won","doi":"10.1016/j.marpolbul.2024.117267","DOIUrl":"10.1016/j.marpolbul.2024.117267","url":null,"abstract":"<div><div>This study investigated the spatial distribution and chemical characteristics of potentially toxic elements (PTEs) in road-deposited sediments (RDS) at the Port of Busan by size fraction. Enrichment factor (EF) values for Zn, Cd, and Sb in fine RDS <250 μm were 52–69, 49–78, and 46–44, respectively, indicating ‘extremely high enrichment’. Various statistical analyses, including PCA and PMF models, revealed a strong correlation between pollution levels in RDS <250 μm and vehicle type, identifying non-exhaust emissions (NEE) of vehicles as a primary source of PTEs in RDS from the port. The risk index (RI) value of fine RDS ranged from 649 to 2238, indicating that the entire study area could be classified as having a ‘significant ecological risk,’ with higher values observed in heavy-duty vehicles (HDV) areas. The study underscores the need for effective NEE management to mitigate the environmental impact of ports on marine ecosystems.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117267"},"PeriodicalIF":5.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142648611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.marpolbul.2024.117273
Jie Li , Junxiang Lai , Guilin Xu , Mingben Xu , Man Wu , Xiaomin Yan , Zihan Pan , Jing Guo
Phaeocystis globosa is the most common species making up harmful algal blooms. For better detect P. globosa bloom, a multispectral approach was developed based on extensive in-situ investigation and MODIS remote sensing reflectance (Rrs) dataset. A novel proxy RPG was created based on the feature of Rrs spectral shape and P. globosa bloom was identified when RPG was >1.6. Normalized Fluorescence Line Height (nFLH) was applied to discriminate the bloom events and nFLH of bloom waters was almost higher than 0.095 Wm−2μm−1sr−1. The RPG associated with nFLH exhibited the P. globosa bloom areas comparable to that in field investigation, which indicated this practical method was successful on the spatial and temporal distribution of P. globosa blooms. Several environmental factors derived from MODIS products and field survey were analyzed to characterize the bloom conditions. Redundancy analysis suggested that nutrients and temperature are vital for triggering P. globosa bloom.
球囊藻是构成有害藻华的最常见物种。为了更好地检测球藻水华，在广泛的现场调查和 MODIS 遥感反射率（Rrs）数据集的基础上开发了一种多光谱方法。根据 Rrs 光谱形状特征创建了一种新的替代 RPG，当 RPG >1.6 时，就能识别出球藻花。应用归一化荧光线高（nFLH）来区分水华事件，水华水域的 nFLH 几乎高于 0.095 Wm-2μm-1sr-1。与 nFLH 相关的 RPG 所显示的球藻藻华区域与实地调查的区域相当，这表明这种实用的方法在球藻藻华的时空分布方面是成功的。分析了从 MODIS 产品和实地调查中得出的若干环境因素，以确定水华的特征。冗余分析表明，营养物质和温度对引发球藻藻华至关重要。
{"title":"Detecting the Phaeocystis globosa bloom and characterizing its bloom condition in the northern Beibu Gulf using MODIS measurements","authors":"Jie Li , Junxiang Lai , Guilin Xu , Mingben Xu , Man Wu , Xiaomin Yan , Zihan Pan , Jing Guo","doi":"10.1016/j.marpolbul.2024.117273","DOIUrl":"10.1016/j.marpolbul.2024.117273","url":null,"abstract":"<div><div><em>Phaeocystis globosa</em> is the most common species making up harmful algal blooms. For better detect <em>P. globosa</em> bloom, a multispectral approach was developed based on extensive in-situ investigation and MODIS remote sensing reflectance (R<sub>rs</sub>) dataset. A novel proxy R<sub>PG</sub> was created based on the feature of R<sub>rs</sub> spectral shape and <em>P. globosa</em> bloom was identified when R<sub>PG</sub> was >1.6. Normalized Fluorescence Line Height (nFLH) was applied to discriminate the bloom events and nFLH of bloom waters was almost higher than 0.095 Wm<sup>−2</sup>μm<sup>−1</sup>sr<sup>−1</sup>. The R<sub>PG</sub> associated with nFLH exhibited the <em>P. globosa</em> bloom areas comparable to that in field investigation, which indicated this practical method was successful on the spatial and temporal distribution of <em>P. globosa</em> blooms. Several environmental factors derived from MODIS products and field survey were analyzed to characterize the bloom conditions. Redundancy analysis suggested that nutrients and temperature are vital for triggering <em>P. globosa</em> bloom.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117273"},"PeriodicalIF":5.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142648612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.marpolbul.2024.117245
Yu Lee Jang , Soeun Eo , Gi Myung Han , Sung Yong Ha , Sang Hee Hong , Won Joon Shim
Visual observation surveys from ships are commonly used for monitoring floating marine debris, but their detection performance has not yet been fully verified. Here, simultaneous visual observation surveys and surface trawling were conducted in three coastal areas of South Korea, each with distinct characteristics. The extent of floating debris missed by visual observations was assessed, and the characteristics of overlooked debris were identified. The mean density of floating debris observed visually was five-fold lower than that obtained from surface trawling. Loss of buoyancy and transparent colour of debris were identified as major factors contributing to the significant difference in density between the two survey methods. Our findings suggest that visual observation can underestimate the density of floating debris, especially in areas with abundant plastic bags and sheets. Supplementary methods such as surface trawls with macro-sized mesh are recommended to accurately assess the level of contamination from floating debris.
{"title":"Ship-based visual observation underestimates plastic debris in marine surface water","authors":"Yu Lee Jang , Soeun Eo , Gi Myung Han , Sung Yong Ha , Sang Hee Hong , Won Joon Shim","doi":"10.1016/j.marpolbul.2024.117245","DOIUrl":"10.1016/j.marpolbul.2024.117245","url":null,"abstract":"<div><div>Visual observation surveys from ships are commonly used for monitoring floating marine debris, but their detection performance has not yet been fully verified. Here, simultaneous visual observation surveys and surface trawling were conducted in three coastal areas of South Korea, each with distinct characteristics. The extent of floating debris missed by visual observations was assessed, and the characteristics of overlooked debris were identified. The mean density of floating debris observed visually was five-fold lower than that obtained from surface trawling. Loss of buoyancy and transparent colour of debris were identified as major factors contributing to the significant difference in density between the two survey methods. Our findings suggest that visual observation can underestimate the density of floating debris, especially in areas with abundant plastic bags and sheets. Supplementary methods such as surface trawls with macro-sized mesh are recommended to accurately assess the level of contamination from floating debris.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117245"},"PeriodicalIF":5.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142644465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.marpolbul.2024.117251
Jeancarlo M. Fajardo-Urbina , Yang Liu , Sonja Georgievska , Ulf Gräwe , Herman J.H. Clercx , Theo Gerkema , Matias Duran-Matute
Several coastal regions require operational forecast systems for predicting the transport of pollutants released during marine accidents. In response to this need, surrogate models offer cost-effective solutions. Here, we propose a surrogate modeling method for predicting the residual transport of particle patches in coastal environments. These patches are collections of passive particles equivalent to Eulerian tracers but can be extended to other particulates. By only using relevant forcing, we train a deep learning model (DLM) to predict the displacement (advection) and spread (dispersion) of particle patches after one tidal period. These quantities are then coupled into a simplified Lagrangian model to obtain predictions for larger times. Predictions with our methodology, successfully applied in the Dutch Wadden Sea, are fast. The trained DLM provides predictions in a few seconds, and our simplified Lagrangian model is one to two orders of magnitude faster than a traditional Lagrangian model fed with currents.
{"title":"Efficient deep learning surrogate method for predicting the transport of particle patches in coastal environments","authors":"Jeancarlo M. Fajardo-Urbina , Yang Liu , Sonja Georgievska , Ulf Gräwe , Herman J.H. Clercx , Theo Gerkema , Matias Duran-Matute","doi":"10.1016/j.marpolbul.2024.117251","DOIUrl":"10.1016/j.marpolbul.2024.117251","url":null,"abstract":"<div><div>Several coastal regions require operational forecast systems for predicting the transport of pollutants released during marine accidents. In response to this need, surrogate models offer cost-effective solutions. Here, we propose a surrogate modeling method for predicting the residual transport of particle patches in coastal environments. These patches are collections of passive particles equivalent to Eulerian tracers but can be extended to other particulates. By only using relevant forcing, we train a deep learning model (DLM) to predict the displacement (advection) and spread (dispersion) of particle patches after one tidal period. These quantities are then coupled into a simplified Lagrangian model to obtain predictions for larger times. Predictions with our methodology, successfully applied in the Dutch Wadden Sea, are fast. The trained DLM provides predictions in a few seconds, and our simplified Lagrangian model is one to two orders of magnitude faster than a traditional Lagrangian model fed with currents.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117251"},"PeriodicalIF":5.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marine plastic pollution is a global issue affecting ecosystems and various aspects of human life. The scientific community is exploring new monitoring and containment approaches. Because in-situ sampling campaigns are time and resource demanding, there is a focus on integrating different approaches for marine litter monitoring. Data of two in-situ surveys (using a manta net) were compared to sea surface currents data and derived products with the aim to find a proxy variable of the plastic occurrence. Sea surface currents data were provided by the CALYPSO HF network (operating in the Sicily Channel since 2012). Notably, the occurrence of fragment items is inversely correlated with the total kinetic energy (r2 ~ 0.85). This result was confirmed by a Lagrangian tracking model considering the deployment of virtual drifters around each in-situ measurement point. The proposed method applied to a wider domain using Copernicus Marine Service (CMS) data revealed that high plastic accumulation areas could be located at the centre of eddies often occurring in the winter period. However, uncertainties arise by the moderate-low correlation found between HF CALYPSO and CMS sea current data.
{"title":"Towards microplastic hotspots detection: A comparative analysis of in-situ sampling and sea surface currents derived by HF radars","authors":"Fulvio Capodici , Laura Corbari , Adam Gauci , Gualtiero Basilone , Angelo Bonanno , Salvatore Campanella , Giuseppe Ciraolo , Angela Candela , Daniela D'Amato , Rosalia Ferreri , Ignazio Fontana , Simona Genovese , Giovanni Giacalone , Giuseppina Marino , Salvatore Aronica","doi":"10.1016/j.marpolbul.2024.117237","DOIUrl":"10.1016/j.marpolbul.2024.117237","url":null,"abstract":"<div><div>Marine plastic pollution is a global issue affecting ecosystems and various aspects of human life. The scientific community is exploring new monitoring and containment approaches<em>.</em> Because <em>in-situ</em> sampling campaigns are time and resource demanding, there is a focus on integrating different approaches for marine litter monitoring. Data of two <em>in-situ</em> surveys (using a manta net) were compared to sea surface currents data and derived products with the aim to find a proxy variable of the plastic occurrence. Sea surface currents data were provided by the CALYPSO HF network (operating in the Sicily Channel since 2012). Notably, the occurrence of fragment items is inversely correlated with the total kinetic energy (r<sup>2</sup> ~ 0.85). This result was confirmed by a Lagrangian tracking model considering the deployment of virtual drifters around each <em>in-situ</em> measurement point. The proposed method applied to a wider domain using Copernicus Marine Service (CMS) data revealed that high plastic accumulation areas could be located at the centre of eddies often occurring in the winter period. However, uncertainties arise by the moderate-low correlation found between HF CALYPSO and CMS sea current data.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117237"},"PeriodicalIF":5.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142644466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.marpolbul.2024.117232
Guangliang Teng , Wen Chen , Xiujuan Shan , Yongqiang Shi , Xianshi Jin
The categories, sources, and distribution of floating marine macro litter (FMML) in the offshore waters of the Bohai Sea and Yellow Sea (BYS) in the summer and autumn of 2021 and the spring of 2022 were investigated by visual ship transect surveys based on imaging video. The average FMML density of the BYS was estimated to be 26.09 ± 130.51 items/km2. From spring to autumn, the density of FMML significantly decreased, and the hotspot areas shifted from the southern Yellow Sea to the northern waters. The temporal and spatial distribution of FMML was influenced by runoff and coastal current transport. Plastic litter accounted for 97.80 % of all FMML types. Domestic litter accounted for 89.86 % of all FMML sources. This study systematically reports the category, source, and spatial distribution of FMML, and the results provide scientific basis for the treatment of marine litter in the BYS.
{"title":"Temporal and spatial distribution of floating marine macro litter in the offshore waters of the Bohai Sea and Yellow Sea (BYS)","authors":"Guangliang Teng , Wen Chen , Xiujuan Shan , Yongqiang Shi , Xianshi Jin","doi":"10.1016/j.marpolbul.2024.117232","DOIUrl":"10.1016/j.marpolbul.2024.117232","url":null,"abstract":"<div><div>The categories, sources, and distribution of floating marine macro litter (FMML) in the offshore waters of the Bohai Sea and Yellow Sea (BYS) in the summer and autumn of 2021 and the spring of 2022 were investigated by visual ship transect surveys based on imaging video. The average FMML density of the BYS was estimated to be 26.09 ± 130.51 items/km<sup>2</sup>. From spring to autumn, the density of FMML significantly decreased, and the hotspot areas shifted from the southern Yellow Sea to the northern waters. The temporal and spatial distribution of FMML was influenced by runoff and coastal current transport. Plastic litter accounted for 97.80 % of all FMML types. Domestic litter accounted for 89.86 % of all FMML sources. This study systematically reports the category, source, and spatial distribution of FMML, and the results provide scientific basis for the treatment of marine litter in the BYS.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117232"},"PeriodicalIF":5.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.marpolbul.2024.117256
Xiujian Hu , Shengwei Cao , Mengtuo Wen , Yuanjing Zhang , Yuewen Zhao , Yaci Liu , Xiangke Kong , Yasong Li
Our study examines nitrogen sources and transformations in Xiamen Bay, where eutrophication has increased due to higher nitrogen levels. By analyzing dissolved organic matter (DOM) and nitrate stable isotopes (δ15N-NO3−and δ18O-NO3−), the study finds that nitrate in low salinity areas is influenced by freshwater-seawater mixing and biogeochemical processes, while in high salinity areas, it is mainly affected by physical mixing. Bayesian mixing model (MixSIAR) results show that the primary nitrate sources are fecal matter and sewage, followed by atmospheric deposition. During the high flow period, DOM may facilitate nitrogen transformation and release through processes such as degradation or mineralization. In contrast, during the low flow period, the system is mainly influenced by the physical mixing of saline and freshwater. Studies have shown that DOM can indicate the biogeochemical intensity in water bodies, further identifying the main factors influencing the distribution and transformation processes of nitrate content, providing a basis for mitigating eutrophication in estuarine areas.
{"title":"Exploration of nitrogen sources and transformation processes in eutrophic estuarine zones based on DOM and stable isotope compositions","authors":"Xiujian Hu , Shengwei Cao , Mengtuo Wen , Yuanjing Zhang , Yuewen Zhao , Yaci Liu , Xiangke Kong , Yasong Li","doi":"10.1016/j.marpolbul.2024.117256","DOIUrl":"10.1016/j.marpolbul.2024.117256","url":null,"abstract":"<div><div>Our study examines nitrogen sources and transformations in Xiamen Bay, where eutrophication has increased due to higher nitrogen levels. By analyzing dissolved organic matter (DOM) and nitrate stable isotopes (δ<sup>15</sup>N-NO<sub>3</sub><sup>−</sup>and δ<sup>18</sup>O-NO<sub>3</sub><sup>−</sup>), the study finds that nitrate in low salinity areas is influenced by freshwater-seawater mixing and biogeochemical processes, while in high salinity areas, it is mainly affected by physical mixing. Bayesian mixing model (MixSIAR) results show that the primary nitrate sources are fecal matter and sewage, followed by atmospheric deposition. During the high flow period, DOM may facilitate nitrogen transformation and release through processes such as degradation or mineralization. In contrast, during the low flow period, the system is mainly influenced by the physical mixing of saline and freshwater. Studies have shown that DOM can indicate the biogeochemical intensity in water bodies, further identifying the main factors influencing the distribution and transformation processes of nitrate content, providing a basis for mitigating eutrophication in estuarine areas.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117256"},"PeriodicalIF":5.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.marpolbul.2024.117236
J.C. Antacli , G.N. Rimondino , R. Di Mauro , G. Alurralde , N. Servetto , M.D. Garcia , G.A. González , S. Morales , R. Sahade , C. Vodopivez , I.R. Schloss
Plastic contamination in the Southern Ocean is a growing issue. This study provides the first comprehensive analysis of marine microplastics (MPs) (0.1–5 mm) in surface sediments in Potter Cove and nearby areas around Argentina's Carlini station (25 de Mayo/King George Island, South Shetlands). Sediment samples from 31 sites (2020−2022) were collected to examine whether MP pollution originates from station activities or ocean currents. All samples contained MPs, averaging 0.18 ± 0.12 MPs/g of sediment, mainly microfibers (MFs) and irregular microfragments (MFRs) (0.11–6.23 mm) and irregular microfragments (MFRs) (0.09–4.57 mm). Infrared spectroscopy identified 13 polymer types, including cellulosic materials, polyester, and polyamide, with most MPs < 1 mm, showing aging signs, similar to laundry wear. This widespread distribution suggests contamination may stem from both local activities and external sources. Findings underscore the urgent need for MP pollution management and further research to identify sources and develop effective mitigation strategies.
{"title":"Microplastic pollution in marine sediments of the Antarctic coastal environment of Potter Cove and nearby areas (25 de Mayo/King George Island, South Shetlands)","authors":"J.C. Antacli , G.N. Rimondino , R. Di Mauro , G. Alurralde , N. Servetto , M.D. Garcia , G.A. González , S. Morales , R. Sahade , C. Vodopivez , I.R. Schloss","doi":"10.1016/j.marpolbul.2024.117236","DOIUrl":"10.1016/j.marpolbul.2024.117236","url":null,"abstract":"<div><div>Plastic contamination in the Southern Ocean is a growing issue. This study provides the first comprehensive analysis of marine microplastics (MPs) (0.1–5 mm) in surface sediments in Potter Cove and nearby areas around Argentina's Carlini station (25 de Mayo/King George Island, South Shetlands). Sediment samples from 31 sites (2020−2022) were collected to examine whether MP pollution originates from station activities or ocean currents. All samples contained MPs, averaging 0.18 ± 0.12 MPs/g of sediment, mainly microfibers (MFs) and irregular microfragments (MFRs) (0.11–6.23 mm) and irregular microfragments (MFRs) (0.09–4.57 mm). Infrared spectroscopy identified 13 polymer types, including cellulosic materials, polyester, and polyamide, with most MPs < 1 mm, showing aging signs, similar to laundry wear. This widespread distribution suggests contamination may stem from both local activities and external sources. Findings underscore the urgent need for MP pollution management and further research to identify sources and develop effective mitigation strategies.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117236"},"PeriodicalIF":5.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.marpolbul.2024.117288
Inés Arteaga , Verónica Pinos-Vélez , Mariana Capparelli , Gabriel M. Moulatlet , Isabel Cipriani-Avila , Marcela Cabrera , Eduardo Rebolledo , Camila Arnés-Urgellés , María Elena Cazar
Microplastics (MPs) were assessed in water and sediment samples along the Salado Estuary, an estuarine system composed of a complex river drainage network in Guayas, Ecuador. MPs were quantified and categorized according to shape, size, and composition. Pellet morphology (237,490 MP/L) and transparent color MPs (252,990 MP/L) were the most common in water, while fragments (27,330 MP/m3) and silver color MPs (25,310 MP/kg) were the most common in solid samples (river sediments, mangrove mud, and sand). MPs made of Polycarbonate, Polyestyrene, and Polypropylene were the most common in all samples. Giving MPs characteristics, likely mapped sources were wastewater from Guayaquil and surrounding towns, boats, and shrimp farms. The samples with the highest MPs were found near Guayaquil, and those with the least were found in the estuary mouth. Monitoring and managing plastic disposal in estuaries are fundamental, as we report a small part of an undocumented issue here.
{"title":"Microplastic occurrence and distribution in the Gulf of Guayaquil, Ecuador","authors":"Inés Arteaga , Verónica Pinos-Vélez , Mariana Capparelli , Gabriel M. Moulatlet , Isabel Cipriani-Avila , Marcela Cabrera , Eduardo Rebolledo , Camila Arnés-Urgellés , María Elena Cazar","doi":"10.1016/j.marpolbul.2024.117288","DOIUrl":"10.1016/j.marpolbul.2024.117288","url":null,"abstract":"<div><div>Microplastics (MPs) were assessed in water and sediment samples along the Salado Estuary, an estuarine system composed of a complex river drainage network in Guayas, Ecuador. MPs were quantified and categorized according to shape, size, and composition. Pellet morphology (237,490 MP/L) and transparent color MPs (252,990 MP/L) were the most common in water, while fragments (27,330 MP/m<sup>3</sup>) and silver color MPs (25,310 MP/kg) were the most common in solid samples (river sediments, mangrove mud, and sand). MPs made of Polycarbonate, Polyestyrene, and Polypropylene were the most common in all samples. Giving MPs characteristics, likely mapped sources were wastewater from Guayaquil and surrounding towns, boats, and shrimp farms. The samples with the highest MPs were found near Guayaquil, and those with the least were found in the estuary mouth. Monitoring and managing plastic disposal in estuaries are fundamental, as we report a small part of an undocumented issue here.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117288"},"PeriodicalIF":5.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Thane Creek-Ulhas estuary confluence region acts as a naturally active infiltration system, crucial for altering water quality in the area and Arabian Sea. Particle-water exchange, hydrodynamics, and anthropogenic discharge influence nutrient transfer and transformation, highlighting the need for effective water quality management in this urbanized ecosystem. We analyzed monthly hydrography and nutrient data in water, and particulates from April 2021 to March 2022, including period of Cyclone Gulab at four locations along the inflow and outflow sectors. Our results revealed prevalent hypoxic conditions in the confluence waters, driven by microbial oxygen demand that surpassed the chemical load due to indiscriminate sewage inflow. Phosphorus emerged as the limiting nutrient, inhibited by adsorption/desorption equilibrium. Dissolved phosphate was transformed into particulate form under intermediate suspended load, with further transform into organic phosphorous during non-monsoon season. Excessive ammonium from sewage during the cyclone and elevated urea during non-monsoon indicated regenerated nitrogen forms, rendering the region eutrophic and hyper-eutrophic, with intermittent organic pollution. Engineering interventions may help mitigate water quality alterations that pose significant ecological risks in this mangrove-dominant confluence ecosystem.
{"title":"Dissolved and suspended nutrient complexity in an urbanized creek-estuary confluence: Implication on water quality alteration","authors":"Balaram Sahu , Umesh Kumar Pradhan , Udayakrishnan P.B. , Priyanka Bambaras","doi":"10.1016/j.marpolbul.2024.117259","DOIUrl":"10.1016/j.marpolbul.2024.117259","url":null,"abstract":"<div><div>The Thane Creek-Ulhas estuary confluence region acts as a naturally active infiltration system, crucial for altering water quality in the area and Arabian Sea. Particle-water exchange, hydrodynamics, and anthropogenic discharge influence nutrient transfer and transformation, highlighting the need for effective water quality management in this urbanized ecosystem. We analyzed monthly hydrography and nutrient data in water, and particulates from April 2021 to March 2022, including period of Cyclone Gulab at four locations along the inflow and outflow sectors. Our results revealed prevalent hypoxic conditions in the confluence waters, driven by microbial oxygen demand that surpassed the chemical load due to indiscriminate sewage inflow. Phosphorus emerged as the limiting nutrient, inhibited by adsorption/desorption equilibrium. Dissolved phosphate was transformed into particulate form under intermediate suspended load, with further transform into organic phosphorous during non-monsoon season. Excessive ammonium from sewage during the cyclone and elevated urea during non-monsoon indicated regenerated nitrogen forms, rendering the region eutrophic and hyper-eutrophic, with intermittent organic pollution. Engineering interventions may help mitigate water quality alterations that pose significant ecological risks in this mangrove-dominant confluence ecosystem.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"209 ","pages":"Article 117259"},"PeriodicalIF":5.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142623253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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