Hydrology and Earth System Sciences
www.hydrol-earth-syst-sci.net
1027-5606
1607-7938
12
2
2008
10.5194/hess-12-353-2008
http://www.hydrol-earth-syst-sci.net/12/353/2008/
http://www.hydrol-earth-syst-sci.net/12/353/2008/hess-12-353-2008.html
http://www.hydrol-earth-syst-sci.net/12/353/2008/hess-12-353-2008.pdf
353
362
2008-03-05
The decreasing importance of acidification episodes with recovery from acidification: an analysis of the 30-year record from Birkenes, Norway
R. F. Wright
richard.wright@niva.no
Norwegian Institute for Water Research, Gaustadallèen 21, 0349 Oslo, Norway
The 30-year record 1975–2004 of weekly samples of streamwater chemistry from
Birkenes, Norway, shows 106 acid episodes below the threshold of ANC−50 µeq l<sup>−1</sup>.
The frequency, severity and duration of episodes have
diminished since about 1990 due to chemical recovery following reduced
deposition of sulphur. In particular SO<sub>4</sub>-driven episodes in the first
runoff following drought have become less intense and less frequent, whereas
episodes driven by climate (wind, high flow) continue. The data show
significant empirical relationships between strength of the driver, degree
of chemical recovery, and severity of ANC depression.
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