The influence of model grid resolution on estimation of national scale nitrogen deposition and exceedance of critical loads

Dore, A.J.; Kryza, M.; Hall, J.R.; Hallsworth, S.; Keller, V.J.D.; Vieno, M.; Sutton, M.A.. 2012 The influence of model grid resolution on estimation of national scale nitrogen deposition and exceedance of critical loads. Biogeosciences, 9 (5). 1597-1609. 10.5194/bg-9-1597-2012

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Abstract/Summary

The Fine Resolution Atmospheric Multi-pollutant Exchange model (FRAME) has been applied to model the spatial distribution of nitrogen deposition and air concentration over the United Kingdom at a 1 km spatial resolution. The modelled deposition and concentration data were gridded at resolutions of 1 km, 5 km and 50 km to test the sensitivity of calculations of the exceedance of critical loads for nitrogen deposition to the deposition data resolution. The modelled concentrations of NO2 were validated by comparison with measurements from the rural sites in the national monitoring network and were found to achieve better agreement with the high resolution 1 km data. High resolution plots were found to represent a more physically realistic distribution of nitrogen air concentrations and deposition resulting from use of 1 km resolution precipitation and emissions data as compared to 5 km resolution data. Summary statistics for national scale exceedance of the critical load for nitrogen deposition were not highly sensitive to the grid resolution of the deposition data but did show greater area exceedance with coarser grid resolution due to spatial averaging of high nitrogen deposition hot spots. Local scale deposition at individual Sites of Special Scientific Interest and high precipitation upland sites was sensitive to choice of grid resolution of deposition data. Use of high resolution data tended to generate lower deposition values in sink areas for nitrogen dry deposition (Sites of Scientific Interest) and higher values in high precipitation upland areas. In areas with generally low exceedance (Scotland) and for certain vegetation types (montane), the exceedance statistics were more sensitive to model data resolution.

Item Type:	Article
Identification Number/DOI:	10.5194/bg-9-1597-2012
Programmes:	CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
CEH Sections:	Billett Boorman Emmett
ISSN:	1726-4170
Additional Information:	Open Access paper - click on Official URL link for full text
Additional Keywords:	nitrogen deposition, eutrophication, atmospheric transport model, ammonia, grid resolution, exceedance, critical load, ecosystem, FRAME
NORA Subject Terms:	Atmospheric Sciences
Date made live:	21 May 2012 14:25
URI:	http://nora.nerc.ac.uk/id/eprint/18070

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