Increased UV-B penetration in a lake owing to drought-induced acidification

Article Abstract:

The re-acidification of the Swan Lake in Sudbury, Canada, due to climatic changes and SO2 emissions has increased ultraviolet penetration in the lake. In boreal lakes, drought reduces the water level and exposes littoral sediments that contain reduced sulphur from earlier atmospheric events. The exposure re-oxidizes sediment sulphur and causes a remobilization of acid in the lake water, thereby decreasing the dissolved organic carbon (DOC) concentration. In Swan Lake, an increase in the aluminium concentration has been the primary cause for a decrease in the DOC level.

Lakes, Eutrophication

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Predicted response of stream chemistry to acid loading tested in Canadian catchments

Article Abstract:

Measurements of climatically-induced acidification in 18 Canadian streams bore out the geochemical theory that catchments react chemically to shifts in acid loading. The detected chemical responses to changes in acid anion loading conformed to the theoretical predictions based on the chemical composition of the runoff. This finding suggests that the susceptibility of catchments to acidification can be forecast from surveys of lake and stream chemistry.

Models, Canada, Rivers, Geochemistry, Acidification

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Fractal stream chemistry and its implications for contaminant transport in catchments

Article Abstract:

Detailed time series of chloride in both rainfall and runoff from headwater catchments at Plynlimon, Wales, were analyzed. Chloride concentrations in rainfall were shown to have a white noise spectrum, and chloride concentrations in streamflow showed fractal 1/f scaling over three orders of magnitude. Such catchments do not have characteristic flushing times.

Water, Underground, Groundwater

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