Wednesday, April 20, 2022

New paper examines agricultural phosphorus surpluses in Ontario

A new paper reconstructs the agricultural phosphorus (P) inputs across the province of Ontario since the 1960s. The first author of the paper, entitled Agricultural phosphorus surplus trajectories for Ontario, Canada (1961-2916), and erosional export risk, is former ERG MSc student Tamara Van Staden. Co-authors include the ERG members Chris Parsons, Zahra Akbarzadeh, and Philippe Van Cappellen, as well as their colleagues Kim Van Meter and Nandita Basu.

Wednesday, April 20, 2022

Philippe Van Cappellen wins prestigious Canadian Geophysical Union Medal

Philippe Van Cappellen has been awarded the J. Tuzo Wilson Medal, the Canadian Geophysical Union's (CGU) greatest honour! Congratulations Philippe!

Check out the press release here: https://uwaterloo.ca/water-institute/news/philippe-van-cappellen-wins-prestigious-canadian-geophysical

Sunday, March 20, 2022

New paper analyzes the effects of flavins and siderophores on the oxidation of ferrous iron by molecular oxygen

The oxidation of Fe(II) plays an important role in the biogeochemical cycling of redox-sensitive elements and the fate and transport of pollutants in subsurface environments. In a joint study by researchers from ERG and China University of Geosciences, the kinetics of aqueous Fe(II) oxidation by O2 were measured at variable pH in the presence of riboflavin and desferrioxamine B as representative flavins and siderophores, respectively. The study closes important gaps in our understanding of the reaction mechanisms involved.

Monday, February 28, 2022

The definition of the non-growing season matters. A new paper by Arash, Eunji, Fereidoun and Philippe published in Environmental Research Communications

A Letter article by Ecohydrology members Arash Rafat, Eunji Byun, Fereidoun Rezanezhad and Philippe Van Cappellen was published in Environmental Research Communications journal! In this study, the impact of alternative definitions of the non-growing season (NGS) for a peatland site with multiple years of CO2 flux records was analysed with defining three NGS climatic parameters: air temperature, soil temperature, and snow cover.

Sunday, February 20, 2022

New paper assesses phosphorus retention by Fanshawe Dam on the Thames River, Ontario

Phosphorus (P) retention in Fanshawe Reservoir was evaluated based on a two-year intensive sampling of water chemistry. The Fanshawe Dam is located on the Thames River, the largest Canadian tributary source of P to the western basin of Lake Erie.  The results indicate that Fanshawe Reservoir reduces the total river P load by as much as 47%. The reservoir, however, is not only an important P sink on the Thames River, but also modulates the seasonal variability and chemical speciation of the river’s P load.

Thursday, February 10, 2022

New paper in Nature Geoscience discusses key steps to address nitrogen pollution and improve water quality.

A study led by Prof. Nandita Basu published in Nature Geoscience provides a roadmap for scientists, policymakers, and the public to overcome the challenges associated with agricultural nitrogen legacies that delay improvements to water quality. While we now have a much better theoretical understanding of the accumulation and fate of nitrogen legacies in agricultural landscapes, there is an urgent need for more systematic measurements and monitoring to effectively support water quality policies.

Thursday, February 3, 2022

Ecohydrology research Group Celebrates 10th Annual Research Symposium on World Wetlands Day

The Ecohydrology Research Group hosted a successful 10th Annual World Wetlands Day Research Symposium at the University of Waterloo on Wednesday February 2, thanks to the efforts not only of our group but also that of wetland researchers across the University.This is the second year in a row that ERG has been partnering with the Waterloo Public Library to organize the symposium virtually.

Tuesday, January 25, 2022

Press release highlights new economic valuation of wetlands in southern Ontario

A new paper by Tariq Aziz and Philippe Van Cappellen uses economic valuation to highlight the importance of Southern Ontario’s wetlands for sediment and phosphorus filtration. A total annual value of $4.2 billion in sediment and phosphorus filtration services was found based on the average rate of sediment accretion plus the associated total phosphorus concentration in each type of wetland in Southern Ontario and estimating how much the removal and disposal of the same amounts of sediment and phosphorus in stormwater management facilities in Ontario would cost.

Saturday, January 22, 2022

New paper explores the roles of pH and dissolved silicate on the adsorption and desorption of phosphate in the presence of ferric iron oxyhydroxides

Phosphorus (P), in the form of aqueous phosphate, is an essential nutrient for the growth of plants and algae. Because it often limits or colimits primary production in freshwater and nearshore marine systems, phosphate enrichment can result in eutrophication and algal blooms. A major process driving phosphate enrichment is the desorption of phosphate from mineral surfaces, in particular those of ferric iron oxyhydroxides.

Thursday, January 20, 2022

New paper on modeling microbially-mediated degradation of organic matter in subsurface environments

Check out the new publication by former ERG researchers Bijen Bajracharya, Christina Smeaton, Igor Markelov, and Ekatarina Markelova, together with Philippe Van Cappellen. The paper presents a novel a bioenergetics-informed kinetic model for the anaerobic degradation of macromolecular organic matter that accounts for extracellular hydrolysis, fermentation, and respiration. The model dynamically calculates the catabolic energy generated by fermentation and respiration.

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