 |
| Titel |
Modelling nitrogen dynamics at Lochnagar, N.E. Scotland. |
| VerfasserIn |
A. Jenkins, R. C. Ferrier, R. C. Helliwell |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 5, no. 3 ; Nr. 5, no. 3, S.519-528 |
| Datensatznummer |
250002571
|
| Publikation (Nr.) |
 copernicus.org/hess-5-519-2001.pdf |
|
|
|
|
|
| Zusammenfassung |
| Controls on nitrate leaching from upland
moorland catchments are not yet fully understood and yet, despite agreements on
emission reductions, increased surface water nitrate
concentrations may affect significantly the acidity status of these waters in
the future. At Lochnagar, an upland moorland catchment in
N.E. Scotland, 12 years of surface water chemistry observations have identified
a steady increase in nitrate concentration despite no
measured change in inorganic nitrogen deposition. The MAGIC model has been
applied to simulate a "best case" situation assuming
nitrate in surface water represents "hydrological" contributions (direct
run-off) and a ‘worst case’ assuming a nitrogen saturation
mechanism in the catchment soil. Only the ‘saturation’ model is capable of
matching the 12 years of observation for nitrate but both
model structures match the pH and acid neutralising capacity record. Future
predictions to 2040, in response to the agreed emission reductions
under the Gothenburg Protocol, are markedly different. The worst case predicts
continued surface water acidification whilst the best case
predicts a steady recovery.
Keywords: nitrogen saturation, modelling, Lochnagar, Gothenburg Protocol |
| |
|
| Teil von |
|
|
|
|
|
|
|
|