On the Calculation and Interpretation of Target Load Functions |
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Authors: | Mattias Alveteg Liisa Martinson |
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Institution: | (1) Department of Chemical Engineering, Lund University, P. O. Box 124, 221 00 Lund, Sweden;(2) Lund University Center of Sustainability Studies (LUCSUS), Lund, Sweden |
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Abstract: | In this study critical load functions and target load functions of nitrogen and sulphur deposition with respect to acidity
and minimum base cation to aluminium ratio were calculated with the SAFE model using three different averaging strategies:
(1) averaging based on current forest generation, (2) averaging based on next generation and (3) averaging based on the entire
simulation period. From the results it is evident that although target load calculation and indeed critical load calculation
is straight forward, there is a problem in translating a predicted recovery according to the target load calculation back
to a site-specific condition. We conclude that a policy strategy for emission reductions that ensures recovery, according
to calculated target load functions, is likely to be beneficial from an ecosystem point of view. However, such a strategy
may not be sufficient to achieve actual non-violation of the chemical criteria throughout the seasonal or rotational variations.
To address this issue we propose a method for calculating dynamic critical loads which ensures that the chosen criteria is
not violated. |
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Keywords: | acidification critical loads modelling recovery the SAFE model |
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