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- W2024808883 abstract "Water source and lake landscape position can strongly influence the physico-chemical characteristics of flowing waters over space and time. We examined the physico-chemical heterogeneity in surface waters of an alpine stream-lake network (>2600 m a.s.l.) in Switzerland. The catchment comprises two basins interspersed with 26 cirque lakes. The larger lakes in each basin are interconnected by streams that converge in a lowermost lake with an outlet stream. The north basin is primarily fed by precipitation and groundwater, whereas the south basin is fed mostly by glacial melt from rock glaciers. Surface flow of the entire channel network contracted by ∼60% in early autumn, when snowmelt runoff ceased and cold temperatures reduced glacial outputs, particularly in the south basin. Average water temperatures were ∼4 °C cooler in the south basin, and temperatures increased by about 4–6 °C along the longitudinal gradient within each basin. Although overall water conductivity was low (<27 µS cm−1) because of bedrock geology (ortho-gneiss), the south basin had two times higher conductivity values than the north basin. Phosphate-phosphorus levels were below analytical detection limits, but particulate phosphorus was about four times higher in the north basin (seasonal average: 9 µg l−1) than in the south basin (seasonal average: 2 µg l−1). Dissolved nitrogen constituents were around two times higher in the south basin than in the north basin, with highest values averaging > 300 µg l−1 (nitrite + nitrate-nitrogen), whereas particulate nitrogen was approximately nine times greater in the north basin (seasonal average: 97 µg l−1) than in the south basin (seasonal average: 12 µg l−1). Total inorganic carbon was low (usually <0·8 mg l−1), silica was sufficient for algal growth, and particulate organic carbon was 4·5 times higher in the north basin (average: 0·9 mg l−1) than in the south basin (average: 0·2 mg l−1). North-basin streams showed strong seasonality in turbidity, particulate-nitrogen and -phosphorus, and particulate organic carbon, whereas strong seasonality in south-basin streams was observed in conductivity and dissolved nitrogen. Lake position influenced the seasonal dynamics in stream temperatures and nutrients, particularly in the groundwater/precipitation-fed north-basin network. Copyright © 2007 John Wiley & Sons, Ltd." @default.
- W2024808883 created "2016-06-24" @default.
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- W2024808883 date "2007-01-01" @default.
- W2024808883 modified "2023-10-07" @default.
- W2024808883 title "Hydrological heterogeneity of an alpine stream–lake network in Switzerland" @default.
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- W2024808883 doi "https://doi.org/10.1002/hyp.6536" @default.
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