Recent studies have highlighted that freshwater salinization is a global issue with a multitude of causes including: road salt application and runoff, wastewater, climate change-enhanced mineral weathering, mining, fertilizer application, construction, evaporation and desiccation, and seawater intrusion. Salinization represents a major perturbation to freshwater biota as well as for biogeochemical cycling. More studies are now highlighting the significant implications of salinization for freshwater biogeochemistry, especially for greenhouse gas and nutrient cycling dynamics, because of the modification of water column density and mixing. Much work has recently been done in Canada revealing the extent of freshwater salinization and the different causes across Canada. This session invites contributions from experts in limnology, hydrology, hydrogeology, biogeochemistry, greenhouse gas dynamics and environmental chemistry to share their findings about the causes, extent, and cumulative and coupled impacts on biogeochemistry and/or biota of freshwater salinization in Canada. This session will take stock of the geographic extent and diversity of the freshwater salinization problem in Canada. Examples of topics could include: analysis of the impact of salinization on mixing regimes and nutrient cycling and greenhouse gas dynamics in different water bodies such as ponds and lakes, hydrogeological investigations into the extent of groundwater salinization; spatial analyses of sources of salinization within and across watersheds; temporal analyses of salinity time series for different water bodies; and lab-scale and field-scale investigations into the interactions between mineralogy hydrology and biogeochemistry in groundwater and/or soil during salinization. Field, laboratory, and/or modeling studies done at any scale are all welcome.

Conveners: Jovana Radosavljevic, Ecohydrology Research Group, Earth & Environmental Sciences, University of Waterloo; Stephanie Slowinski, Ecohydrology Research Group, Earth & Environmental Sciences, University of Waterloo; Claire Oswald, Department of Geography & Environmental Studies, Toronto Metropolitan University; Philippe Van Cappellen, Ecohydrology Research Group, Earth & Environmental Sciences and Water Institute, University of Waterloo

10:30am - 10:45am The unseen pathway: groundwater chloride inputs to urban streams
Presenter(s): Clare Robinson

10:45am - 11:00am Global lakes and reservoir depth-area-volume relationships: From global database to individual waterbodies
Presenter(s): Shendge Yu

11:00am - 11:15am Sodium Sorption and Desorption in Riparian Soils Impacted by Road Salt Application    
Presenter(s): Luana Camelo

11:15am - 11:30am Groundwater Vulnerability to Road Salt in Multi-layered Fractured Bedrock Aquifers: The City of Guelph and Suburbs, ON Case Study    
Presenter(s): Max (Mansour) Salek

11:30am - 11:45am Constraining seasonal and spatial ambient and urban groundwater contributions to streamflow using stable isotopes of water and chloride across a mixed land-use regional-scale Precambrian Shield watershed    
Presenter(s): Kimberly Montgomery

11:45am - 12:00pm High-frequency data provides insight on chloride transport pathways and exceedances of chronic chloride guidelines for the protection of aquatic life in streams impacted by deicers
Presenter(s): Wyatt Weatherson