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Freshwater alkalinity: 1976-2008

Freshwater alkalinity: 1976-2008

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Uploaded 16 Feb 2012 by GRID-Arendal
Year: 2009
From collection: Vital Water Graphics 2
Author: Philippe Rekacewicz (Le Monde diplomatique), February 2006
Description:
Alkalinity is commonly used to indicate a water body’s capacity to buffer against acidity; that is, the ability to resist, or dampen, changes in pH. Thus, alkaline compounds in water, such as bicarbonates, carbonates, and hydroxides, lower the acidity of the water and increase the pH. Alkalinity (as CaCO3) was analysed for all sampling stations available at the continental level. Concentrations remained reasonably steady between the two decades for Africa, Asia, South America and Australasia, but significant increases were noted for European and North American rivers, which may indicate a shift towards reduced acidic impacts at the continental scale. Overall, during the last 30 years , alkalinity has decreased in North America and Europe, but has significantly increased in Asia. Examination of the outflow stations in 82 monitored river basins indicate a decrease in bicarbonate concentrations between the two decades , in the northern latitudes, including North America, Europe and ...
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