Article
Environmental Sciences
Tianyu Xia, Wangshou Zhang, Hengpeng Li, Huiliang Wang, Peng He, Xingfeng Wang
Summary: Methane (CH4) emissions from river networks, particularly in urban areas, have become a global issue. Factors influencing CH4 production vary in different river reaches, with agricultural and urban rivers being affected by carbon sources and total phosphorus, while forested and mixed-landscape rivers are influenced by dissolved oxygen and oxidation-reduction potential. Rivers draining contrasting landscapes exhibit distinct potentials to emit CH4, with urban rivers having the highest emissions. Management strategies should target river reaches with the highest emission potentials and consider the influences of different riverine environmental conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Limnology
Lauren A. Bolotin, Betsy M. Summers, Philip Savoy, Joanna R. Blaszczak
Summary: Freshwater salinization of rivers is caused by accelerated weathering and release of salt loads from human activities. Two dominant salinity regimes have been found, characterized by a summer-fall peak or a spring decline. Precipitation amount, stream slope, and soil salinity were identified as the most important predictors of salinity regime classification.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Limnology
Spencer J. Tassone, Alice F. Besterman, Cal D. Buelo, Dat T. Ha, Jonathan A. Walter, Michael L. Pace
Summary: The frequency of heatwaves in rivers has been increasing in the United States, particularly in summer and fall, in mid- to high-order streams, and at free-flowing sites and sites above a reservoir. This increase in frequency is accompanied by an increase in moderate strength heatwaves and a doubling of the annual mean total number of heatwave days at a site. These heatwaves are often associated with normal or below-normal discharge conditions and occur at sites with lower mean annual discharge.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Engineering, Environmental
Sigrid Mares, Ivan Moreno-Andrade, Guillermo Quijano
Summary: Hydrogenotrophic methanogens require trace metals for their metabolic activity, so the addition of these trace metals is necessary when using gas-phase bioreactors to produce methane from CO2 and H2 streams. This study investigated the kinetic effects of different concentrations of iron, zinc, molybdenum, cobalt, and nickel on hydrogenotrophic methane production. The dominant archaea in the culture were Methanolinea and Methanobacterium, with relative abundances of 67.16% and 28.15% respectively. The optimal concentrations of Fe, Zn, Mo, Co, and Ni were determined to be 1.479, 0.063, 0.011, 0.032, and 0.061 mg gVSS-1, respectively. Higher concentrations of trace metals led to inhibited performance in terms of lag phase duration, maximum methane production rate, and maximum volume of methane produced.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Mohammed Ombadi, Charuleka Varadharajan
Summary: This study examines the effects of floods on salinity by analyzing long-term observational records of daily streamflow and specific conductance in 259 monitoring sites across the United States. The results show that salinity changes during flood events exhibit large variability, with dilution being the prevailing mechanism. The analysis also reveals that the antecedent conditions of salinity prior to the flood are the most important factor in explaining intra-site variability.
Article
Agriculture, Dairy & Animal Science
Xi-Wen Peng, Jing Lan, Zi-Jian Sun, Wen-Bo Zhu, Tian Zhao
Summary: This study aimed to understand the elevational and seasonal amphibian phylogenetic structures in temperate montane streams. The results showed that the elevational spatial patterns were not significantly different, but the seasonal temporal patterns differed significantly for amphibian phylogenetic structures, associated with the variation of microhabitat variables.
Article
Biochemistry & Molecular Biology
Elisa Catao C. P., Thomas Pollet, Cedric Garnier, Raphaelle Barry-Martinet, Karine Rehel, Isabelle Linossier, Alina Tunin-Ley, Jean Turquet, Jean-Francois Briand
Summary: Free-living, particle attached, and biofilm marine microbial communities display distinct characteristics in terms of environmental conditions and sources of organisms. Different coastal areas show varied impacts of water quality and resources on the lifestyles of marine microbial communities.
Article
Geochemistry & Geophysics
Layla Ghazi, Miguel Goni, Brian A. Haley, Jesse M. Muratli, Julie C. Pett-Ridge
Summary: This study examines the relationship between dissolved rhenium concentrations and water runoff in the Eel and Umpqua Rivers. The results show that rhenium concentrations are higher in the Eel River compared to the Umpqua River, suggesting different sources of dissolved rhenium. Primary mineral dissolution and oxidation of petrogenic carbon are likely dominant sources of dissolved rhenium.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Ahmed S. Al-Amoudi, Seungwon Ihm, A. Mohammed Farooque, Eslam S. B. Al-Waznani, Nikolay Voutchkov
Summary: A dual brine concentration concept was demonstrated using commercial membranes. The NF system was introduced upstream of the RO system, and the MBC system was introduced after RO to concentrate the brine. The NF-RO-MBC system produced two valuable brines: a highly concentrated monovalent ion stream and a divalent ion stream with high concentrations. The system has a recovery rate of 65.2%, with a production cost of 0.57 USD/m3 for fresh water and 28.87 USD/dry t NaCl for NaCl brine. Rating: 8 out of 10.
Article
Environmental Sciences
Virginia Mosquera, Hjalmar Laudon, Meredith Blackburn, Eliza Maher Hasselquist, Ryan A. Sponseller
Summary: Flow regulates the concentrations of different solutes differently, with organic solutes mainly limited by transport capacity and inorganic solutes mainly limited by their sources. The relationships between solute concentration and flow are influenced by catchment structure, and these changes can affect the concentrations and resource ratios of solutes in streams, with subsequent impacts on aquatic ecological processes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Thomas G. Huntington, Michael E. Wieczorek
Summary: The study investigated the changes in total organic carbon (TOC) concentrations and the C-Q relation in 8 rivers in New England, USA from 1973 to 2019. The results showed a decline in TOC concentrations in all rivers and an increase in the C-Q slope in most seasons between the two periods. This increase is likely related to changes in TOC sources, such as waste water inputs, urban runoff, and production through photosynthesis in aquatic systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Fanyan Yang, Jicheng Zhong, Shaoming Wang, Xiaokang Hu, Hongwei Wang, Mengyao Tang, Min Zhang, Chuanzhe Sun, Lei Zhang
Summary: In this study, the temporal and spatial variability of CH4 concentrations and diffusive fluxes were investigated in a temperate river-reservoir system in North China. The results showed significant heterogeneity in CH4 concentrations and fluxes, with the river inflow zone being a hotspot for CH4 emissions and autumn having the highest CH4 flux. Water temperature, water depth, and water productivity were identified as the main factors regulating CH4 concentration and diffusive flux.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Martin R. Kurek, Fenix Garcia-Tigreros, Kimberly P. Wickland, Karen E. Frey, Mark M. Dornblaser, Robert G. Striegl, Sydney F. Niles, Amy M. McKenna, Pieter J. K. Aukes, Ethan D. Kyzivat, Chao Wang, Tamlin M. Pavelsky, Laurence C. Smith, Sherry L. Schiff, David Butman, Robert G. M. Spencer
Summary: Northern high-latitude lakes are important in cycling dissolved organic carbon (DOC) from outside sources to the atmosphere. However, the distribution of dissolved organic matter (DOM) in Arctic-boreal regions is mostly unknown. This study expands on regional studies by investigating the composition of DOM in lakes across the Canadian Taiga to the Alaskan Tundra. The results show that DOM becomes more processed and aromaticity increases towards the north, indicating greater incorporation of DOM from outside sources. Additionally, the study found that hydrologically isolated lakes had different trends in DOC and aromaticity compared to lakes with connectivity to the surrounding landscape.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Limnology
Taylor Maavara, Craig Brinkerhoff, Jacob Hosen, Kelly Aho, Laura Logozzo, James Saiers, Aron Stubbins, Peter Raymond
Summary: River networks play an important role in transporting dissolved organic carbon (DOC) from land to the coastal ocean. The uptake of DOC in a river network is influenced by factors such as stream order, seasonal conditions, and flow. However, the dominance of biological or abiotic processes in DOC uptake and the partitioning of uptake between lakes and rivers are still unclear. In this study, a new model named CUPS-OF-DOC is presented to quantify DOC cycling in a river network, taking into account river-lake connectivity. The model is applied to the Connecticut River Watershed, revealing that the proportion of DOC uptake from photomineralization varies across different flow conditions and stream orders.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Limnology
Amanda G. DelVecchia, Spencer Rhea, Kelly S. Aho, Emily H. Stanley, Erin R. Hotchkiss, Alice Carter, Emily S. Bernhardt
Summary: Streams and rivers are major sources of greenhouse gas emissions. While our understanding of individual gas flux drivers has improved, the lack of consistently collected samples hinders our ability to analyze the interrelationship between gas concentrations and their drivers. This study analyzed a dataset collected by the National Ecological Observatory Network, providing insights into the physical and biogeochemical drivers of greenhouse gas production in 27 streams and rivers across the United States. The results show that physical drivers such as temperature, stream slope, dissolved oxygen, and total nitrogen concentration strongly influence the concentrations of CO2 and CH4, while N2O is exclusively correlated with total nitrogen concentration.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Fisheries
Nathaniel P. Hitt, Karli M. Rogers, Karmann G. Kessler, Martin A. Briggs, Jennifer H. Fair
Summary: This study evaluated the impact of karst terrain on stream fish communities and found that karst terrain plays a crucial role in regulating stream temperature, resulting in more stable fish communities compared to other areas. However, stream thermal sensitivity was a stronger predictor of species persistence, highlighting the importance of local variation in groundwater discharge processes. The presence of calcium precipitates (marl) in stream substrates was associated with low thermal sensitivity and ecological stability over time, suggesting it may serve as an indicator of climate change refugia in stream ecosystems.
ECOLOGY OF FRESHWATER FISH
(2023)
Article
Engineering, Environmental
Martin R. Kurek, Fenix Garcia-Tigreros, Natalie A. Nichols, Gregory K. Druschel, Kimberly P. Wickland, Mark M. Dornblaser, Robert G. Striegl, Sydney F. Niles, Amy M. McKenna, Pieter J. K. Aukes, Ethan D. Kyzivat, Chao Wang, Laurence C. Smith, Sherry L. Schiff, David Butman, Robert G. M. Spencer
Summary: Redox-active functional groups in dissolved organic matter (DOM) play a crucial role in microbial electron transfer and methane emissions. This study quantifies the electron donating and accepting capacities of DOM from northern high-latitude lakes and investigates their relationships with DOM composition. The results show that the redox properties of DOM are strongly tied to aromaticity and negatively related to aliphaticity and protein-like content. These findings have implications for water quality and methane emissions in these lakes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Andrew L. Mullen, Jennifer D. Watts, Brendan M. Rogers, Mark L. Carroll, Clayton D. Elder, Jonas Noomah, Zachary Williams, Jordan A. Caraballo-Vega, Allison Bredder, Eliza Rickenbaugh, Eric Levenson, Sarah W. Cooley, Jacqueline K. Y. Hung, Greg Fiske, Stefano Potter, Yili Yang, Charles E. Miller, Susan M. Natali, Thomas A. Douglas, Ethan D. Kyzivat
Summary: Small water bodies, such as ponds, have a significant impact on Earth System processes, but detecting and monitoring them using satellite imagery has been challenging. A new approach using high-resolution optical satellite imagery and deep learning methods allows for mapping seasonal changes in pond and lake areas. This method has various applications including assessing water resources, land cover change, wildlife management, and biogeochemical modeling.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Ethan D. Kyzivat, Laurence. C. Smith
Summary: Landsat has been used for surface water mapping since 1972, but its 30 m resolution limits the detection of small water bodies. In this study, a 10x super resolution model trained with high-resolution imagery improved the detection of small lakes in Landsat imagery and produced images with preserved radiometric properties. The super resolution transformation achieved a higher F-1 score for water detection compared to native-resolution Landsat.
GISCIENCE & REMOTE SENSING
(2023)
Article
Limnology
Laura A. Logozzo, Jacob D. Hosen, Johnae McArthur, Peter A. Raymond
Summary: Riverine dissolved iron (Fe) has significant impacts on water color, nutrients, and marine carbon cycling. The size and coupling of Fe with dissolved organic matter (DOM) play a crucial role in its biogeochemical function. This study investigated the drivers, concentrations, and fluxes of different fractions of dissolved Fe in the freshwater Connecticut River. The results showed that the concentrations and responses to discharge of colloidal and soluble Fe were different, with soluble Fe being strongly influenced by water temperature and coupled with humic-like DOM fluorescence component.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Bo Wang, Laurence C. Smith, Colin Gleason, Ethan D. Kyzivat, Jessica V. Fayne, Merritt E. Harlan, Theodore Langhorst, Dongmei Feng, Emily Eidam, Sebastian Munoz, Julianne Davis, Tamlin M. Pavelsky, Daniel L. Peters
Summary: Using in situ measurements and 37 years of satellite imagery, we have identified a slow avulsion of the Athabasca River in the Peace-Athabasca River Delta, Canada. This gradual channel change could have long-term implications for inundation patterns, ecosystems, and human use of the area.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Seth N. N. Goldstein, Jonathan C. C. Ryan, Penelope R. R. How, Sarah E. E. Esenther, Lincoln H. H. Pitcher, Adam L. L. LeWinter, Brandon T. T. Overstreet, Ethan D. D. Kyzivat, Jessica V. V. Fayne, Laurence C. C. Smith
Summary: Georectified time-lapse camera images accurately retrieve stage fluctuations of the proglacial Minturn River, enabling effective monitoring of meltwater runoff from the Greenland Ice Sheet. This non-contact approach provides a promising method for studying proglacial hydrological processes in harsh polar environments.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Multidisciplinary Sciences
Gerard Rocher-Ros, Emily H. Stanley, Luke C. Loken, Nora J. Casson, Peter A. Raymond, Shaoda Liu, Giuseppe Amatulli, Ryan A. Sponseller
Summary: Methane emissions from running waters account for a significant portion of global emissions and are influenced by edaphic and climate features. These emissions are not strongly temperature dependent and are characterized by large fluxes in different environments.
Article
Environmental Sciences
Chao Wang, Tamlin M. Pavelsky, Ethan D. Kyzivat, Fenix Garcia-Tigreros, Erika Podest, Fangfang Yao, Xiao Yang, Shuai Zhang, Conghe Song, Theodore Langhorst, Wayana Dolan, Martin R. Kurek, Merritt E. Harlan, Laurence C. Smith, David E. Butman, Robert G. M. Spencer, Colin J. Gleason, Kimberly P. Wickland, Robert G. Striegl, Daniel L. Peters
Summary: In this study, a cloud-based workflow was built to map wetland vegetation communities in the Peace-Athabasca Delta (PAD), Canada, using high-resolution multi-sensor datasets. The results show that classifications derived from AVIRIS-NG have higher accuracies than UAVSAR or LiDAR for mapping wetland vegetation communities. Combining information from multiple sensors can improve classification accuracy, and the best performing model achieved an overall accuracy of 93.5%.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Emily H. Stanley, Luke C. Loken, Nora J. Casson, Samantha K. Oliver, Ryan A. Sponseller, Marcus B. Wallin, Liwei Zhang, Gerard Rocher-Ros
Summary: Despite their small size, fluvial ecosystems play a significant role in carbon processing and methane emissions. However, progress in understanding and estimating methane concentrations and fluxes in streams and rivers has been slow due to variability and limited data availability. In order to address these challenges, the Global River Methane Database (GriMeDB) provides a comprehensive resource of methane concentrations and fluxes, along with physical and chemical data, to examine environmental drivers and estimate fluvial contributions to methane emissions.
EARTH SYSTEM SCIENCE DATA
(2023)