Use this URL to cite or link to this record in EThOS:
Title: Biogeochemical modelling of acid sensitive systems in Scotland : influence of scale and the potential role of enhanced nitrogen deposition
Author: Helliwell, R. C.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2000
Availability of Full Text:
Access from EThOS:
The focus of this thesis is on biogeochemical cycling in terrestrial ecosystems, and the effects on soil and surface water quality at a range of spatial scales throughout Scotland. The fundamental challenge of this research was to integrate the dynamic Model of Acidification of Groundwater In Catchments (MAGIC), within a spatial framework, by extrapolating knowledge of biogeochemical processes at the catchment scale to larger (i.e. regional and national) spatial units. The MAGIC model was applied to 9 Scottish sites in the U.K. Acid Waters Monitoring Network (UKAWMN), 59 sites in the region of Galloway and 733 sites throughout Scotland. Reduction in sulphur (S) emissions associated with the Second S Protocol and different forestry (land use) scenarios were modelled at these different scales to predict the existing and likely future extent of soil and surface water acidification in Scotland. The sensitivity of MAGIC to soil input data derived from two different methodologies was tested at the national scale. Anticipated reductions in S emissions are predicted to have a marginal beneficial effect on the reversibility of soil acidification at all spatial scales throughout Scotland, irrespective of the methodology used to determine the soil input parameters. With the exception of the most acid sensitive parts of Scotland, surface water Acid Neutralising Capacity (ANC) modelled at a national scale presents a picture of improving ANC in response to the Second S Protocol. From a policy perspective however, these results are potentially misleading. It is important that European legislation targets the most acid sensitive soils and surface waters as it is these ecosystems that require protection.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available