Article
Oceanography
Colin A. Stedmon, Rainer M. W. Amon, Dorothea Bauch, Astrid Bracher, Rafael Goncalves-Araujo, Mario Hoppmann, Richard Krishfield, Samuel Laney, Benjamin Rabe, Heather Reader, Mats A. Granskog
Summary: This study highlights the potential of dissolved organic matter (DOM) as a tracer in the Arctic Ocean, particularly in the halocline layer. By measuring the fluorescence levels of DOM, distinct contributions from different sources can be distinguished and help evaluate ocean circulation patterns.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Eurico J. D'Sa, Hyun-Cheol Kim, Sun-Yong Ha, Ishan Joshi
Summary: The Ross Sea in the Southern Ocean is a highly productive region that plays a significant role in deep water formation and carbon cycling. The study of dissolved organic carbon (DOC) concentrations and chromophoric dissolved organic matter (CDOM) absorption and fluorescence properties during the austral summer revealed regional differences in CDOM characteristics, indicating the influence of marine productivity on optical properties of organic matter.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Engineering, Marine
Timoci Koliyavu, Chloe Martias, Awnesh Singh, Stephane Mounier, Philippe Gerard, Cecile Dupouy
Summary: Heavy rain events were found to impact the biogeochemical outflows and ecosystem health in the coastal waters of small Pacific Islands. Analysis revealed higher values of most components (along with most tested variables) at the southwest coast during the wet season, consistent with surface currents outflow. Additionally, the positive correlation of dissolved organic carbon (DOC) with nutrients suggests the utilization of DOM as an energy source.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
L. O. Vidal, T. Lambert, L. C. Cotovicz Jr, M. C. Bernardes, R. Sobrinho, F. Thompson, G. D. Garcia, B. A. Knoppers, P. Gatts, C. R. Regis, G. Abril, C. E. Rezende
Summary: This study investigated the sources and transformations of dissolved organic matter (DOM) in the Paraiba do Sul River and mangrove waters, and found that river discharge and salinity gradient affect the composition and contribution of DOM. Tidal fluctuations were also found to impact carbon input and DOM composition in the mangrove creek.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Heejun Han, Hyung Bo Kim, Jeonghyun Kim, Guebuem Kim, Jeomshik Hwang, SungHyun Nam
Summary: In August 2020, dissolved organic carbon (DOC) and the optical properties of dissolved organic matter (CDOM and FDOM) were measured in the northwestern Pacific marginal seas to understand their distribution and drivers. The concentrations of DOC and CDOM/FDOM in surface waters were primarily influenced by the Changjiang River, but high concentrations were also observed in the central Yellow Sea region due to continental shelf-water. The East/Japan Sea showed low DOC concentrations and high FDOM values. The distribution of DOM was influenced by the mixing of multiple water masses, and optical signatures of DOM can be used to trace its origins and characteristics.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Jianchun Yu, Guoping Zhu, Yasong Wang, Yinghui Wang, Lulu Han, Zijun Liu, Xi Zhang, Yunping Xu
Summary: Polar ecosystems are vulnerable to climate warming and sea ice decline. By analyzing surface water samples from the Southern Ocean off Prydz Bay, this study found that sea ice melting has a significant impact on the concentration and composition of dissolved organic matter (DOM). During the sea ice melting season, higher concentrations of DOC and protein-like components were observed, while during the post-sea ice melting season, lower concentrations of DOC and humic-like components were found. The results suggest that sea ice melting drives a transition from more labile to more refractory DOM in the polar ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Andrea Malits, Chiara Monforte, Clara Iachetti, Marina Gerea, Maite Latorre
Summary: Dissolved organic matter (DOM) in the eastern Beagle Channel was analyzed to understand its distribution, source, and transformation in relation to microbial abundances and physicochemical gradients. DOM evolution was studied during tidal cycles in two distinct water masses. Fluorescent signals were used to differentiate labile and non-labile material, while various proxies were employed to assess biological activity and trace the quality and origin of DOM. The results showed increased chlorophyll concentration and protein-like fluorophores indicating the onset of a bloom event. Humic-like material from terrestrial sources was found throughout the water column, with higher amounts in the inner sector. The accumulation of humic-like material in bottom waters suggested the functioning of a microbial carbon pump fueled by terrestrial DOM sources.
JOURNAL OF MARINE SYSTEMS
(2023)
Article
Environmental Sciences
Xiaohui Zhang, Fang Cao, Ying Huang, Jianwu Tang
Summary: This study investigates the dissolved organic matter (DOM) in coastal tidal marsh-estuary systems in the Changjiang River Estuary (CRE). The DOM composition varies with hydrological regimes, seasons, and environmental conditions, and is influenced by removal processes such as photochemical and microbial degradations. The study reveals the dynamics of DOM and its optical properties, as well as the impact of photochemistry and microbial alterations on DOM removal. Principal component analysis (PCA) helps to understand the processes regulating DOM dynamics and differentiate between different marshes and samples affected by episodic weather events. The study highlights the significance of large rivers like the Changjiang River in estuarine marsh DOM dynamics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Remote Sensing
Arvind Sahay, Syed Moosa Ali, Mini Raman, Anurag Gupta, Gunjan Motwani, Rohan Thakker, Anima Tirkey, Hitesh A. Solanki, Palanisamy Shanmugam
Summary: Chromophoric Dissolved Organic Matter (CDOM) is a significant factor in the optical properties and biogeochemistry of water. This study aims to establish a relationship between CDOM absorption and remote sensing reflectance in Indian coastal waters, and presents a new algorithm for estimating CDOM absorption. The results show the algorithm's potential for accurate retrieval of CDOM absorption in coastal areas using high-resolution ocean color sensors.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2022)
Article
Engineering, Environmental
Marc Philibert, Simin Luo, Lavel Moussanas, Qingqing Yuan, Emmanuelle Filloux, Flavia Zraick, Kathleen R. Murphy
Summary: This study analyzed the fluorescence composition of surface waters and predicted aromaticity and treatability using samples from different regions and water treatment plants. Nine fluorescence components were identified and ratios between these components were found to predict chemical properties and water treatment efficacy. These findings have important implications for water treatment applications.
Article
Environmental Sciences
Xuemei Yang, Jie Yuan, Fu-Jun Yue, Si-Liang Li, Baoli Wang, Mohammad Mohinuzzaman, Yijun Liu, Nicola Senesi, Xinyu Lao, Longlong Li, Cong-Qiang Liu, Rob M. Ellam, Davide Vione, Khan M. G. Mostofa
Summary: This study reveals the production and degradation processes of fluorescent dissolved organic matter (FDOM) influenced by phytoplankton and dark-microbial respiration under diurnal-day time sunlight and night time conditions, with significant effects of temperature. The transformation of FDOM components is associated with the production of EPS, fluctuation of nutrients, and the presence of various organic substances in lake water, providing insights into the broader paradigm for future impacts on global warming-mediated DOM dynamics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Rapid urbanization significantly alters carbon biogeochemical cycle and river hydrology. This study found that urban land use increases the levels of dissolved organic matter (DOM) and its autochthonous sources in rivers. Urban-induced nutrient enrichment also contributes to the increased DOM production in rivers.
ENVIRONMENTAL RESEARCH
(2022)
Article
Oceanography
Christian Lonborg, Lachlan I. W. McKinna, Matthew M. Slivkoff, Catia Carreira
Summary: The study found that CDOM values in the Great Barrier Reef are comparable to those found in other oligotrophic coastal waters, with higher terrestrial contribution and lower photochemical degradation of CDOM during the Austral wet season. Additionally, the relationship between DOC and CDOM varies depending on the DOC properties or source, while the poor correlation between CDOM and salinity may be due to extensive photochemical degradation and generally low river inputs in the Great Barrier Reef.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Environmental Sciences
Yasong Wang, Bilin Liu, Weichao Wu, Liang Liu, Yinghui Wang, Yunping Xu
Summary: The concentration and composition of dissolved organic matter (DOM) in water samples collected from the Kuroshio-Oyashio confluence region were examined. The concentration of dissolved organic carbon (DOC) ranged from 30.54 to 113.21 μmol L-1, with higher concentrations observed in surface waters. Different fluorescent components in the water samples were identified and their intensities varied among different years. Water temperature was found to be correlated with the composition and intensity of DOM.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: The sources and quality of DOM in streams are influenced by the landscape and season, and serve as good indicators of pCO2.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Christian Lonborg, Aris Thomasberger, Peter A. U. Staehr, Anders Stockmarr, Sayantan Sengupta, Mikkel Lydholm Rasmussen, Lisbeth Tangaa Nielsen, Lars Boye Hansen, Karen Timmermann
Summary: Coastal waters are productive and diverse ecosystems dominated by marine submerged aquatic vegetation (SAV) and affected by human pressures. Traditional and emerging remote sensing technologies, such as satellite, aircraft, drones, and acoustics, are compared for monitoring marine SAV, with recommendations for future surveys and monitoring programs.
INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT
(2022)
Article
Ecology
Ernesto Villarino, James R. Watson, Guillem Chust, A. John Woodill, Benjamin Klempay, Bror Jonsson, Josep M. Gasol, Ramiro Logares, Ramon Massana, Caterina R. Giner, Guillem Salazar, X. Anton Alvarez-Salgado, Teresa S. Catala, Carlos M. Duarte, Susana Agusti, Francisco Mauro, Xabier Irigoien, Andrew D. Barton
Summary: This study conducted a comparative analysis of surface and deep ocean microbial communities and found that their spatial distribution is closely related to oceanic distance and environmental gradients. The dispersal rates and body sizes of prokaryotes and picoeukaryotes contributed to the differences in community similarity. In the deep ocean, both oceanic distance and environment played significant roles in shaping microbial spatial distribution, while in the surface ocean, the influence of the environment was stronger.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2022)
Review
Oceanography
Markel Gomez-Letona, Javier Aristegui, Nauzet Hernandez-Hernandez, Xose Anton Alvarez-Salgado, Marta Alvarez, Erick Delgadillo, Maria Perez-Lorenzo, Eva Teira, Santiago Hernandez-Leon
Summary: Organic matter influences the composition and metabolism of marine prokaryotes. This study investigates the relationship between fluorescent dissolved organic matter and prokaryotic community composition in the deep ocean. The results show that water mass mixing, oxygen utilization, and productivity proxies are important factors explaining the distribution of different fluorescence components. The diversity and taxonomic composition of prokaryotic communities are found to vary between water masses, suggesting a link between community composition, oxygen utilization, and fluorescent dissolved organic matter.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Limnology
Markel Gomez-Letona, Javier Aristegui, Nauzet Hernandez-Hernandez, Maria Perez-Lorenzo, Xose Anton Alvarez-Salgado, Eva Teira, Marta Sebastian
Summary: This study investigates the vertical connectivity between surface productivity regimes and deep ocean prokaryotic communities. The results show that higher prokaryotic abundances and viabilities, as well as smaller cell sizes, are observed below highly productive surface waters. However, leucine uptake rates in deep waters do not show a clear relationship with surface productivity.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Xose Anton Alvarez-Salgado, Maria Jose Fernandez-Reiriz, Isabel Fuentes-Santos, Luis T. Antelo, Antonio A. Alonso, Uxio Labarta
Summary: Assessing the carbon footprint of marine bivalve aquaculture requires considering the CO2 emissions from capital goods, aquaculture operations, and the metabolic CO2 budget of the cultured species. This study presents the metabolic CO2 budget for mussel aquaculture in the Northwest Iberian upwelling, incorporating environmental, biochemical, and metabolic data. The estimates vary depending on the individual mussels' seeding time and harvesting size, with the carbon footprint associated with mussel shell remaining constant at 365 kg CO2 per ton of shell and the carbon footprint associated with mussel flesh ranging from 92 to 578 kg CO2 per ton of mussel flesh.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Cristina Romera-Castillo, Jonathan Heras, Marta Alvarez, X. Anton Alvarez-Salgado, Gadea Mata, Eduardo Saenz-de-Cabezon
Summary: The distribution of non-conservative variables in the deep open ocean is influenced by the circulation and mixing of water masses and ongoing biological and geochemical processes. Estimating the contribution of different water masses is useful for understanding their distribution and separating the physical and biogeochemical components of variable variability. Machine learning models can be used to solve water mass mixing and provide real-time results, expanding knowledge of water mass composition and distribution in the ocean.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Patrizia Stipcich, Pedro Beca-Carretero, Xose Anton Alvarez-Salgado, Eugenia T. Apostolaki, Niki Chartosia, Pavlos Theofilos Efthymiadis, Carlos E. Jimenez, Gabriella La Manna, Arianna Pansini, Elena Principato, Vasilis Resaikos, Dagmar B. Stengel, Giulia Ceccherelli
Summary: The nutritional content of primary producers has an impact on the entire food web. This study investigated the changes in nutritional value of the endemic Mediterranean seagrass Posidonia oceanica associated with temperature rise and the occurrence of marine heat waves. The results showed a decrease in unsaturated fatty acids and C/N ratio, as well as an increase in monounsaturated fatty acids and nitrogen content during marine heat waves. However, the leaf biochemical composition seemed to be adapted to local water temperature, with only a few significant changes observed during marine heat waves. Future increases in temperature and frequency of marine heat waves may lead to changes in the nutritional value and palatability of seagrass leaves.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Ruben Campanero, Nadia Burgoa, Bieito Fernandez-Castro, Sara Valiente, Mar Nieto-Cid, Alba M. Martinez-Perez, Maria Dolores Gelado-Caballero, Nauzet Hernandez-Hernandez, Angeles Marrero-Diaz, Francisco Machin, Angel Rodriguez-Santana, Ines Hernandez-Garcia, Antonio Delgado-Huertas, Antonio Martinez-Marrero, Javier Aristegui, Xose Anton Alvarez-Salgado
Summary: In this study, the distributions of dissolved and suspended organic matter in the Cape Verde Frontal Zone (CVFZ) were investigated at high resolution. The results indicate that the input of Sahara dust and release of DOM from sinking particles are key factors contributing to the complexity of DOM and POM dynamics in the CVFZ.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Microbiology
Maider Justel-Diez, Erick Delgadillo-Nuno, Alberto Gutierrez-Barral, Paula Garcia-Otero, Isaac Alonso-Barciela, Pablo Pereira-Villanueva, Xose Anton Alvarez-Salgado, Alberto Velando, Eva Teira, Emilio Fernandez
Summary: This study investigated the role of seabird guano in marine ecosystem functioning by adding different concentrations of gull guano to microbial communities collected from coastal waters in NW Spain. Results showed that guano stimulated the growth of certain bacteria and diatoms, and increased chlorophyll a concentration. The study also revealed that guano altered the phytoplankton-bacteria interaction from neutral to positive in low-nutrient environments, but from positive to neutral in high-nutrient environments.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Shuaidong Li, Lize Meng, Chu Zhao, Yu Gu, Robert G. M. Spencer, Xose Anton Alvarez-Salgado, Anne M. Kellerman, Amy M. McKenna, Tao Huang, Hao Yang, Changchun Huang
Summary: This study investigates the composition and transformation of dissolved organic matter (DOM) in the Yangtze River during long-distance transport and seasonal cycle. The results show that the concentration of dissolved organic carbon (DOC) in the Yangtze River is relatively low, indicating a significant contribution from allochthonous sources. The composition of DOM changes with the slowing water flow and changing hydrological conditions. This research provides important insights into the biogeochemical cycling of DOM in a large river.
Article
Oceanography
M. Segura-Noguera, X. A. Alvarez-Salgado, S. Siedlecki, B. R. Hales
Summary: This study found that the concentrations of inorganic nitrogen may increase in coastal waters after the bloom of phytoplankton and the cessation of upwelling favorable winds. Additionally, the loss of nitrogen was found to occur mainly in particle-rich, low oxygen waters, rather than only in seafloor sediments. These findings emphasize the importance of considering the complete nitrogen cycle in water columns, rather than focusing solely on individual nutrients.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
E. Jerusalen-Lleo, M. Nieto-Cid, I. Fuentes-Santos, Thorsten Dittmar, X. A. Alvarez-Salgado
Summary: Our knowledge of the composition of ocean dissolved organic matter (DOM) is limited due to its molecular diversity, low individual compound concentration, and high ionic strength of ocean waters. Solid phase extraction (SPE) using styrene divinyl benzene polymer cartridges (PPL) is the most commonly used method to concentrate DOM. In this study, we investigate the efficiency and selectivity of SPE-PPL in extracting DOM from Arctic, Mediterranean, and Antarctic waters in the Cape Vert Frontal Zone (CVFZ). We found that the extraction efficiencies varied for different DOM pools and displayed significant differences among water masses.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Water Resources
Jessica Z. Buser-Young, Patricia E. Garcia, Matthew O. Schrenk, Peter J. Regier, Nicholas D. Ward, Kadir Bice, Scott C. Brooks, Erika C. Freeman, Christian Lonborg
Summary: This study evaluates the environmental and biological factors influencing the transformation of organic matter (OM) in inland waters based on data from a crowdsourced sampling campaign. The results show variations in biogeochemical processes and microbial respiration rates between sediment and surface water along river continua, independent of latitude. The study also identifies patterns in OM composition related to local and reach characteristics, and highlights the importance of understanding changes in OM cycling across hydrologic systems.
FRONTIERS IN WATER
(2023)
Article
Environmental Sciences
Juan Severino Pino Ibanhez, Xose Anton Alvarez-Salgado, Carlos Rocha
Summary: The study found that the water sources in the Ria de Vigo catchment have high levels of radon (Rn-222), which may have negative effects on health. During the dry season, the radon levels in the water sources are nearly double compared to the wet season, leading to a total effective dose of radiation that exceeds the recommended limit when consuming untreated groundwater. Therefore, it is recommended to implement measures such as radon remediation during the dry season to protect the health of residents.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Water Resources
Mikayla A. Borton, Sarah M. Collins, Emily B. Graham, Vanessa A. Garayburu-Caruso, Amy E. Goldman, Michaela de Melo, Lupita Renteria, James C. Stegen
Summary: This article presents a community effort that engages the scientific community throughout the entire publication process, from hypothesis generation to final publication. The project utilizes a shared dataset from 97 river corridors to study organic matter composition. Through a virtual workshop, scientists from over 20 countries and 60 institutions generated questions, hypotheses, and proposed analyses. The community is currently collectively analyzing, interpreting, and synthesizing the data, which will result in six crowdsourced articles.
FRONTIERS IN WATER
(2022)
Article
Oceanography
Pernille Tonnesen, Shane Gero
Summary: Studying the behavior of deep-sea animals is challenging, but animal-borne camera tags may help understand predator-prey interactions. Research showed that camera-associated white light may affect foraging behavior, but has minimal long-term fitness impact on sperm whales. However, this impact should be considered and monitored for longer camera tag deployments.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2024)
Article
Oceanography
Sarah N. de Mendonca, Anna Metaxas
Summary: Ecological processes impact spatial patterns in abundance and distribution of megafauna. This study used spatial statistics to identify significant megafaunal patterns in the Laurentian Channel Marine Protected Area. The patterns varied among taxa and were related to geological factors. The study highlights the importance of considering fine-scale patterns and provides insights for ecological research, monitoring, and conservation in deep-sea ecosystems.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2024)