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The Role of Mineral Weathering Rate Determinations in Generating Uncertainties in the Calculation of Critical Loads of Acidity and their Exceedance |
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| Authors: | Langan Simon Hodson Mark Bain Derek Hornung Mike Reynolds Brian Hall Jane Johnston Lynne |
| Institution: | (1) Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, U.K.;(2) Postgraduate Research Institute for Sedimentology, University of Reading, Reading, U.K;(3) Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, U.K;(4) Institute of Terrestrial Ecology, Merlewood, Grange-over-Sands, Cumbria, U.K;(5) Centre for Ecology and Hydrology, University College North Wales, Bangor, U.K;(6) Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, U.K |
| Abstract: | Current legislation within Europe aimed at limitingecosystem damage resulting from inputs of atmosphericpollution is based on the critical load concept. Mineralweathering rates are central to the calculation ofcritical loads (acceptable levels) of acid deposition.The authors have undertaken a number of studies whichillustrate the complications and limitations inherent inpredicting mineral weathering rates and the implicationswhich these have for critical loads calculations andmapping. Calculated weathering rates and critical loadsfor two acid-sensitive parent materials (greywackes andgranites) are presented and are used to illustrate theimpact that uncertainty can have on critical loadexceedances. The results have obvious implications forportraying the uncertainties of critical loads to policy makers. |
| Keywords: | critical loads exceedance mineralweathering rates soils uncertainty |
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