BGS Hosted Metadata
Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2019-2021
This data resource consists of two files: (a) 1x1 km resolution Average Accumulated Exceedance (AAE) data summarising the exceedances of acidity critical loads for eight habitats; (b) 1x1 km resolution summarising the exceedances of nutrient nitrogen critical loads for thirteen habitats. The data provide information on the amount of excess acid or nitrogen deposition above the critical load values set to protect acid- and nitrogen-sensitive habitats in the UK. The AAE has been calculated using UK 1x1 km Concentration Based Estimated Deposition (CBED) data for 2019-21 (see related data collection). The data were generated under Defra-funded work to assess the potential areas of acid and nitrogen sensitive habitats at risk of adverse impacts from excess atmospheric acid and nitrogen deposition. Reducing the area and amount of critical load exceedance continues to be a driver of Government policy on reducing emissions of acidic and nitrogen-containing air pollutants (sulphur dioxide, nitrogen oxides and ammonia). Full details about this dataset can be found at https://doi.org/10.5285/959a71fe-3340-4a0f-83b3-1cc981709502
Simple
- Date (Publication)
- 2024-09-27
- Date (Creation)
- 2024-07-29
- Citation identifier
- https://catalogue.ceh.ac.uk/id/959a71fe-3340-4a0f-83b3-1cc981709502
- Citation identifier
- doi: / 10.5285/959a71fe-3340-4a0f-83b3-1cc981709502
- Other citation details
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Sawicka, K., Martin Hernandez, C., Rowe, E. (2024). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2019-2021. NERC EDS Environmental Information Data Centre 10.5285/959a71fe-3340-4a0f-83b3-1cc981709502
- Point of contact
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Organisation name Individual name Electronic mail address Role UK Centre for Ecology & Hydrology Sawicka, K. Author UK Centre for Ecology & Hydrology Martin Hernandez, C. Author UK Centre for Ecology & Hydrology Rowe, E. Author NERC EDS Environmental Information Data Centre Publisher UK Centre for Ecology & Hydrology Sawicka, K. Point of contact NERC EDS Environmental Information Data Centre Custodian Department for Environment, Food & Rural Affairs EMAIL NOT PROVIDED
Owner
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GEMET - INSPIRE themes, version 1.0
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Atmospheric Conditions
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- Access constraints
- Other restrictions
- Other constraints
- no limitations
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© Crown copyright and database right
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If you reuse this data, you should cite: Sawicka, K., Martin Hernandez, C., Rowe, E. (2024). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2019-2021. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/959a71fe-3340-4a0f-83b3-1cc981709502
- Spatial representation type
- Grid
- Distance
- 1000 urn:ogc:def:uom:EPSG::9001
- Language
- English
- Character set
- UTF8
- Topic category
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- Climatology, meteorology, atmosphere
- Begin date
- 2019-01-01
- End date
- 2021-12-31
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- Unique resource identifier
- OSGB 1936 / British National Grid
- Distribution format
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Name Version TIFF
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre
Distributor
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/data/959a71fe-3340-4a0f-83b3-1cc981709502 Download the data
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/sd/959a71fe-3340-4a0f-83b3-1cc981709502.zip Supporting information
- Hierarchy level
- Dataset
- Other
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dataset
Conformance result
- Title
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Statement
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Average Accumulated Exceedance (AAE) is calculated at 1x1 km resolution and summarises the exceedance of critical loads of acidity, and of nutrient nitrogen, for multiple habitats. It is derived from the exceedance (i.e. the amount of excess acid or nitrogen deposition above the critical load) for each habitat, the exceeded habitat area and the total acid- or nitrogen-sensitive habitat area in each 1x1 km grid square. For all habitats (except managed woodland) nutrient nitrogen, empirical critical loads have been allocated values based on habitat type and have been defined under the Coordination Centre for Effects (CCE) working group as part of the United Nations Economic Commission for Europe (UNECE) Convention on Long-range Transboundary Air Pollution UNECE. ( https://wge-cce.org/Publications/Other_CCE_Reports/Review_and_revision_of_empirical_critical_loads_and_dose_response_relationships_2011) . For managed woodlands the steady state mass-balance approach is used where the long-term inputs and outputs of nitrogen from the system are calculated based on nitrogen uptake (removal by harvesting of trees), nitrogen immobilisation, denitrification, and nitrogen leaching. Acidity critical loads are based on the mineralogy and chemistry of the dominant soil type in each 1km grid square together with habitat-specific data. Critical load values are calculated depending on soil type - mineral soils or peat soils. Critical loads for acidity and nutrient nitrogen are compared with deposition data over the UK using three-year rolling mean 1x1 km Concentration Based Estimated Deposition. By overlaying CBED data of acid or nitrogen deposition on the critical loads data for acidity and nitrogen, exceedance maps can be generated. Simple statistics are further generated to quantify the area of sensitive habitats associated with critical load exceedances. Exceedances are calculated separately for each habitat type using habitat-specific deposition values: mean deposition to moorland (ie, low-growing vegetation) is applied to the coastal, grassland, heathland and montane habitats; mean deposition to forests is applied to all woodland habitats. Critical loads for terrestrial habitats are mapped at 1km resolution and national deposition data are currently available on a 5km grid. Exceedances for these habitats are calculated at 1km resolution by assuming that deposition values remain constant across each 5km grid square. Exceedances for freshwaters use catchment-weighted deposition values. Further details are given in the supporting documentation which gives reference to the full online methodological report.
Metadata
- File identifier
- 959a71fe-3340-4a0f-83b3-1cc981709502 XML
- Metadata language
- English
- Character set
- 8859 Part 1
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2025-03-21T12:33:58
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre Point of contact
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