These datasets provide Concentration Based Estimated Deposition (CBED) values of sulphur and nitrogen atmospheric deposition for 5x5 kilometre (km) grid squares of the UK averaged over the years 2011 to 2013.
The data consist of deposition values for sulphur, oxidised nitrogen and reduced nitrogen, and base cations. Total deposition is the sum of four components calculated separately: wet deposition, dry deposition of gases, dry deposition of particulate matter and cloud droplet deposition.
Habitat-specific data are provided for (i) moorland/short vegetation everywhere, and (ii) forest everywhere. Additionally, the grid square average over multiple land cover types (i.e. arable, grassland, forest, moorland, urban) is also calculated. The habitat-specific data are recommended for use with critical loads for the calculation of critical load exceedances. The work in generating and compiling the dataset has been funded by the Centre for Ecology and Hydrology (CEH) and various Department for Environment, Food & Rural Affairs (Defra) contracts.
Publication date: 2017-01-10 ( created 2016-11-24 )
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Supporting information available to assist in re-use of this dataset
UK Acidifying and Eutrophying Atmospheric Pollutants
United Kingdom Eutrophying & Acidifying Network (UKEAP)
Beswick, K.M., Choularton, T.W., Inglis, D.W.F., Dore, A.J. & Fowler, D. 2003. Influences on long-term trends in ion concentration and deposition at Holme Moss. Atmospheric Environment, 37 (14), 1927-1940.
Dore, A.J., Choularton, T.W. & Inglis, D.W.F. 2001. Monitoring studies of precipitation and cap cloud chemistry at Holme Moss in the Southern Pennines. Water, Air and Soil Pollution: Focus 1; 381-390.
Fowler, D., Cape, J.N., Leith, I.D., Choularton, T.W., Gay, M.J. & Jones, A. 1988. The influence of altitude on rainfall composition at Great Dun Fell. Atmospheric Environment, 22, 1355-1362.
Hallsworth, S., Sutton, M.A., Dore, A.J., Dragosits, U., Tang, Y.S. & Vieno, M. 2010. The role of the indicator choice in quantifying the ammonia threat to the Natura 2000 network. Environmental Science & Policy, 13, 671-687
RoTAP. 2012. Review of Transboundary Air Pollution: Acidifcation, Eutrophication, Ground Level Ozone and Heavy Metals in the UK. Contract Report to the Department for Environment, Food and Rural Affairs. Centre for Ecology and Hydrology. www.rotap.ceh.ac.uk
Smith, R.I., Fowler, D., Sutton, M.A., Flechard, C. & Coyle, M. 2000. Regional estimation of pollutant gas deposition in the UK: model description, sensitivity analyses and outputs. Atmospheric Environment, 34, 3757-3777.
Stedman, J.R., Kent, A.J., Grice, S., Bush, T.J. & Derwent, R.G. 2007. A consistent method for modelling PM10 and PM2.5 concentrations across the United Kingdom in 2004 for air quality assessment. Atmospheric Environment, 41, 161-172.
A web map service (WMS) exists for this dataset
The Concentration Based Estimated Deposition (CBED) methodology generates 5x5 km resolution maps of wet and dry deposition of sulphur, oxidised and reduced nitrogen, and base cations from measured concentrations of gases and particulate matter in air and measured concentrations of ions in precipitation. These data are collected at sites in the UK Eutrophying and Acidifying Pollutants (UKEAP) network. The site-based measurements are first interpolated to generate maps of concentrations for the UK. The ion concentrations in precipitation are combined with an annual precipitation map from the UK Meteorological Office to generate values of wet deposition. Gas and particulate matter concentration maps are combined with spatially distributed estimates of habitat-specific deposition velocities to generate dry deposition for 5 land cover categories: forest, moorland, grassland, arable and urban. The deposition to the 5 land cover categories are combined, depending on the relative proportions of different land cover categories in the 5x5 km grid square, to generate values for grid square averaged deposition. Dry deposition includes deposition of gases (Sulphur Dioxide (SO2), Nitric Acid (HNO3), Nitrogen Dioxide (NO2) and Ammonia (NH3) and particulate matter (sulphate, nitrate, ammonium, calcium and magnesium) to vegetation. For critical load exceedance calculations, deposition values for moorland are applied to all non-woodland habitats, and deposition values for forest are applied to all woodland habitats.
Data processing was done using the GenStat programme and results output as text files. These were then exported as comma separated values for ingestion into the Environmental Information Data Centre.