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| Titel |
Assessing emission reduction targets with dynamic models: deriving target load functions for use in integrated assessment |
| VerfasserIn |
A. Jenkins, B. J. Cosby, R. C. Ferrier, T. Larssen, M. Posch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 7, no. 4 ; Nr. 7, no. 4, S.609-617 |
| Datensatznummer |
250004716
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| Publikation (Nr.) |
 copernicus.org/hess-7-609-2003.pdf |
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| Zusammenfassung |
| International agreements to reduce the emission of acidifying sulphur (S) and
nitrogen (N) compounds have been negotiated on the basis of an understanding of the link
between acidification related changes in soil and surface water chemistry and terrestrial
and aquatic biota. The quantification of this link is incorporated within the concept of
critical loads. Critical loads are calculated using steady state models and give no
indication of the time within which acidified ecosystems might be expected to recover.
Dynamic models provide an opportunity to assess the timescale of recovery and can go
further to provide outputs which can be used in future emission reduction strategies. In
this respect, the Target Load Function (TLF) is proposed as a means of assessing the
deposition load necessary to restore a damaged ecosystem to some pre-defined acceptable
state by a certain time in the future. A target load represents the deposition of S and
N in a defined year (implementation year) for which the critical limit is achieved in a
defined time (target year). A TLF is constructed using an appropriate dynamic model to
determine the value of a chemical criterion at a given point in time given a temporal
pattern of S and N deposition loads. A TLF requires information regarding: (i) the
chemical criterion required to protect the chosen biological receptor (i.e. the critical
limit); (ii) the year in which the critical limit is required to be achieved; and (iii)
time pattern of future emission reductions. In addition, the TLF can be assessed for
whole regions to incorporate the effect of these three essentially ecosystem management
decisions.
Keywords: emission reduction, critical load, target load, dynamic model, recovery time |
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