Identification info

Metadata Language

English (en)

Character set

utf8

Dataset Reference Date ()

2018-08-09

Identifier

https://catalogue.ceh.ac.uk/id/e32745d2-fb56-4f91-a235-6b213a8b45cb

Identifier

doi: / 10.5285/e32745d2-fb56-4f91-a235-6b213a8b45cb

Other citation details

Hall, J. (2018). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for 2013-15. NERC Environmental Information Data Centre 10.5285/e32745d2-fb56-4f91-a235-6b213a8b45cb

GEMET - INSPIRE themes, version 1.0 ()

• Atmospheric Conditions

Keywords

• Pollution
• nutrient nitrogen
• critical loads
• acidity

Limitations on Public Access

otherRestrictions

Other constraints

no limitations

Use constraints

otherRestrictions

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This resource is made available under the terms of the Open Government Licence

Use constraints

otherRestrictions

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© Crown copyright and database right

Use constraints

otherRestrictions

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If you reuse this data, you should cite: Hall, J. (2018). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for 2013-15. NERC Environmental Information Data Centre https://doi.org/10.5285/e32745d2-fb56-4f91-a235-6b213a8b45cb

Spatial representation type

textTable

Distance

1000  urn:ogc:def:uom:EPSG::9001

Topic category

• Environment
• Climatology, meteorology, atmosphere

N

S

E

W

Begin date

2013-01-01

End date

2015-12-31

Code

OSGB 1936 / British National Grid

Distribution Information

Data format

• Comma-separated values (CSV) ()

Quality Scope

dataset

Other

dataset

Statement

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 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 nutrien nitoren are compared with deposition data over the UK using three-year rolling mean 5x5 km Concentration Based Estimated Deposition (https://doi.org/10.5285/fd8151e9-0ee2-4dfa-a254-470c9bb9bc1e). 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 (2015)

Metadata

File identifier

e32745d2-fb56-4f91-a235-6b213a8b45cb XML

Metadata Language

English (en)

Character set

ISO/IEC 8859-1 (also known as Latin 1)

Resource type

dataset

Hierarchy level name

dataset

Metadata Date

2022-09-26T09:28:30

Metadata standard name

UK GEMINI

Metadata standard version

2.3