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| Titel |
Projected change in atmospheric nitrogen deposition to the Baltic Sea towards 2020 |
| VerfasserIn |
C. Geels, K. M. Hansen, J. H. Christensen, C. Ambelas Skjøth, T. Ellermann, G. B. Hedegaard, O. Hertel, L. M. Frohn, A. Gross, J. Brandt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 5 ; Nr. 12, no. 5 (2012-03-08), S.2615-2629 |
| Datensatznummer |
250010866
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| Publikation (Nr.) |
 copernicus.org/acp-12-2615-2012.pdf |
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| Zusammenfassung |
| The ecological status of the Baltic Sea has for many years been affected by
the high input of both waterborne and airborne nutrients. The focus here is
on the airborne input of nitrogen (N) and the projected changes in this
input, assuming the new National Emission Ceilings directive (NEC-II),
currently under negotiation in the EU, is fulfilled towards the year 2020.
With a set of scenario simulations, the Danish Eulerian Hemispheric Model
(DEHM) has been used to estimate the development in nitrogen deposition
based on present day meteorology combined with present day (2007) or future
(2020) anthropogenic emissions. Applying a so-called tagging method in the
DEHM model, the contribution from ship traffic and from each of the nine
countries with coastlines to the Baltic Sea has been assessed. The annual
deposition to the Baltic Sea is estimated to 203 k tonnes N for the present
day scenario (2007) and 165 k tonnes N in the 2020 scenario, giving a
projected reduction of 38 k tonnes N in the annual load in 2020. This equals
a decline in nitrogen deposition of 19%. The results from 20 model runs
using the tagging method show that of the total nitrogen deposition in 2007,
52% came from emissions within the bordering countries. By 2020, this is
projected to decrease to 48%. For some countries the projected decrease
in nitrogen deposition arising from the implementation of the NEC-II
directive will contribute significantly to compliance with the reductions
agreed on in the provisional reduction targets of the Baltic Sea Action
Plan. This underlines the importance of including projections like the
current in future updates of the Baltic Sea Action Plan. |
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