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• W4312127905 endingPage "6245" @default.
• W4312127905 startingPage "6227" @default.
• W4312127905 abstract "Abstract. Relationships between nitrate concentrations and discharge rates (C–Q) at the catchment outlet can provide insights into sources, mobilization and biogeochemical transformations of nitrate within the catchment. Nitrate C–Q relationships often exhibit considerable scatter that might be related to variable hydrologic conditions during runoff events at sampling time, corresponding to variable sources and flow paths despite similar discharge (Q) rates. Although previous studies investigated the origins of this scatter in individual or in a few catchments, the role of different runoff event types across a large set of catchments is not yet fully understood. This study combines a hydrological runoff event classification framework with low-frequency nitrate samples in 184 catchments to explore the role of different runoff events in shaping long-term C–Q relationships and their variability across contrasting catchments. In most of the catchments, snow-impacted events produce positive deviations of concentrations, indicating an increased nitrate mobilization compared to the long-term pattern. In contrast, negative deviations occur mostly for rainfall-induced events with dry antecedent conditions, indicating the occurrence of lower nitrate concentrations (C) in river flows than their long-term pattern values during this type of event. Pronounced differences in event runoff coefficients among different event types indicate their contrasting levels of hydrologic connectivity that in turn might play a key role in controlling nitrate transport due to the activation of faster flow paths between sources and streams. Using long-term, low-frequency nitrate data, we demonstrate that runoff event types shape observed scatter in long-term C–Q relationships according to their level of hydrologic connectivity. In addition, we hypothesize that the level of biogeochemical attenuation of catchments can partially explain the spatial variability of the scatter during different event types." @default.
• W4312127905 created "2023-01-04" @default.
• W4312127905 creator A5002561403 @default.
• W4312127905 creator A5012321099 @default.
• W4312127905 creator A5015307937 @default.
• W4312127905 creator A5020146466 @default.
• W4312127905 creator A5031533790 @default.
• W4312127905 creator A5063615223 @default.
• W4312127905 date "2022-12-12" @default.
• W4312127905 modified "2023-10-01" @default.
• W4312127905 title "Disentangling scatter in long-term concentration–discharge relationships: the role of event types" @default.
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