Results 51 to 60 of about 19,968 (263)

Effects of a Perennial Drought on Nitrate Fate in an Agriculturally Dominated Mesoscale Catchment as Constrained by Stable Isotope Investigations

Hydrological Processes, Volume 40, Issue 1, January 2026.
Our study shows that nitrate concentrations in both groundwater and surface water decreased during a 3‐year drought at the mesoscale river basin level, especially in agricultural regions with anthropogenic nitrate sources. This decline is due to temporary retention and dilution in the soil zone rather than denitrification, as suggested by the stable ...
Christin Mueller, Ronald Krieg, Ralf Merz, Kay Knöller   +3 more
wiley   +1 more source

Effects of model complexity on karst catchment runoff modeling for flood warning systems

Journal of Hydrology X
Severe flood events are deemed more frequent in the near future with a changing climate. Headwater catchments, especially when karstified, exhibit a pronounced susceptibility to swift and substantial responses to precipitation events, leading to flooding.
Paul Knöll, Ferry Schiperski, Antonia Roesrath, Traugott Scheytt   +3 more
doaj   +1 more source

Cold-water corals and hydrochemistry - is there a unifying link? [PDF]

, 2010
Physical and chemical parameters were measured in five different regions of the Northeast Atlantic with known occurrences of cold-water coral reefs and mounds and in the Mediterranean, where these corals form living carpets over existing morphologies. In
Dullo, Wolf-Christian, Flögel, Sascha, Mienis, Furu, Rüggeberg, Andres   +3 more
core  

Tubular microfossils from ∼2.8 to 2.7Ga-old lacustrine deposits of South Africa: A sign for early origin of eukaryotes? [PDF]

, 2016
Unequivocal evidence for Archean eukaryotic life has been long sought for and is a matter of lively debate. In the absence of unambiguous fossils this debate has focused on biogeochemical signatures and molecular phylogenies.
Altermann, Wladyslaw, Franchi, Ian, Kaźmierczak, Józef, Kremer, Barbara   +3 more
core   +2 more sources

Isotopic constraints on active nitrification in a eutrophic artificially oxygenated lake: Implications for nitrate regeneration and nitrous oxide production

Limnology and Oceanography, Volume 71, Issue 1, January 2026.
Abstract Nitrification is a key process in the aquatic nitrogen (N) cycle, but its products, nitrate (NO3−) and nitrous oxide (N2O), contribute to eutrophication and greenhouse gas emissions, particularly in eutrophic lakes. Variations in in‐lake N cycling and N2O production pathways, as a function of seasonality and artificial oxygenation, remain ...
Alessandra Mazzoli, Claudia Frey, Cameron M. Callbeck, Jakob Zopfi, Teresa Einzmann, Chiara Piantoni, Tim J. Paulus, Moritz F. Lehmann   +7 more
wiley   +1 more source

Monitoring of Polychlorinated Biphenyls in the Transboundary Ile River and Characteristics of Its Transformations Along the River’s Discharge

Applied Sciences
This study presents the level of polychlorinated biphenyl (PCB) pollution in the transboundary Ile River in 2015, 2018, 2019, 2023, and 2024. PCB contamination of water, as well as the presence of a large number of individual congeners, including ...
Nariman Amirgaliev, Akhmetkal Medeu, Christian Opp, Azamat Madibekov, Laura Ismukhanova, Askhat Zhadi   +5 more
doaj   +1 more source

Hydrochemistry types of the Bauru Aquifer System in the State of São Paulo

Revista Águas Subterrâneas, 2016
Groundwater is used for public supply in 55% of Brazilian municipalities. In the state of São Paulo approximately 72% of the cities, with an estimated population of 5.5 million inhabitants, are fully or partially supplied by groundwater, being Bauru ...
Chang Hung Kiang, Marcia Regina Stradioto, Flávio Paula e Silva   +2 more
doaj   +1 more source

Microbial nitrogen removal and recycling in the redox transition zone of a meromictic lake and its coupling to sulfur cycling

Limnology and Oceanography, Volume 71, Issue 1, January 2026.
Abstract Organotrophic denitrification is an important nitrogen (N) removal process in lakes, but alternative N reduction processes such as lithotrophic sulfur (S)‐oxidizing denitrification may be greatly underappreciated. We studied the redox transition zone (RTZ) in the meromictic water column of the North Basin of Lake Lugano (Switzerland) to ...
Jana Tischer, Moritz F. Lehmann, Guangyi Su, Fabio Lepori, Jakob Zopfi   +4 more
wiley   +1 more source

Quantifying Atmospheric Humidity in the Western Mediterranean During the Iron Age and the Roman Era

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Atmospheric moisture is a key hydroclimatic parameter that influenced ancient societies, agriculture, and ecosystems. However, quantitative constraints on pre‐industrial atmospheric humidity values are rarely available. Here, the triple oxygen (17O/16O and 18O/16O) and hydrogen (2H/1H) isotope compositions of lacustrine gypsum are used to ...
Fernando Gázquez, Claudia Voigt, Aurora Castillo‐Baquera, Antonio García‐Alix, Gonzalo Jiménez‐Moreno, Francisco Jíménez‐Espejo, Lucía Martegani, Marta Rodrigo‐Gámiz, Alejandro Jiménez‐Bonilla, Miguel Rodríguez‐Rodríguez   +9 more
wiley   +1 more source

Hydrogeochemical Dynamics and Response of Karst Catchment to Rainstorms in a Critical Zone Observatory (CZO), Southwest China

Frontiers in Water, 2020
Karst water is vital for local drinking and irrigation but is susceptible to contamination. Hydrochemistry, which is highly related to carbonate weathering in karst catchments, can affect water quality and respond rapidly to climate change.
Caiqing Qin, Caiqing Qin, Hu Ding, Si-Liang Li, Si-Liang Li, Si-Liang Li, Fu-Jun Yue, Zhong-Jun Wang, Jie Zeng   +8 more
doaj   +1 more source