Abstract
Abstract. 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−1. The frequency, severity and duration of episodes have diminished since about 1990 due to chemical recovery following reduced deposition of sulphur. In particular SO4-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.
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference35 articles.
1. Aas, W., Solberg, S., Berg, T., Manø, S., and Yttri, K. E.: Monitoring of long-range transported polluted air and precipitation, Atmospheric deposition 2003, 903/2004, The Norwegian State Pollution Control Authority, Oslo, Norway, 2004 (in Norwegian).
2. Christophersen, N., Neal, C., Hooper, R. P., Vogt, R. D., and Andersen, S.: Modelling streamwater chemistry as a mixture of soil water end-members; A step towards second generation acidification models, J. Hydrol., 116, 307–320, 1990.
3. Christophersen, N., Seip, H. M., and Wright, R. F.: A model for streamwater chemistry at Birkenes, Norway, Water Resour. Res., 18, 977–996, 1982.
4. Christophersen, N. and Wright, R. F.: Sulfate budget and a model for sulfate concentrations in streamwater at Birkenes, a small forested catchment in southernmost Norway, Water Resour. Res., 17, 377–389, 1981.
5. Davies, T. D., Tranter, M., Wigington, P. J., and Eshleman, K. N.: "Acidic episodes" in surface waters in Europe, J. Hydrol., 132, 25–69, 1992.
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献