Date (Publication)

2022-07-25

Date (Creation)

2022-07-18

Citation identifier

https://catalogue.ceh.ac.uk/id/049b5fd2-3f12-48fc-8b43-57fa4db649ae

Citation identifier

doi: / 10.5285/049b5fd2-3f12-48fc-8b43-57fa4db649ae

Other citation details

Rowe, E.C., Hina, N.S., Sawicka, K. (2022). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2017-2019. NERC EDS Environmental Information Data Centre 10.5285/049b5fd2-3f12-48fc-8b43-57fa4db649ae

Point of contact

Organisation name	Individual name	Electronic mail address	Role
UK Centre for Ecology & Hydrology	Rowe, E.C.	enquiries@ceh.ac.uk	Author
UK Centre for Ecology & Hydrology	Hina, N.S.	enquiries@ceh.ac.uk	Author
UK Centre for Ecology & Hydrology	Sawicka, K.	enquiries@ceh.ac.uk	Author
UK Centre for Ecology & Hydrology	Rowe, E.C.	enquiries@ceh.ac.uk	Point of contact
NERC EDS Environmental Information Data Centre		info@eidc.ac.uk	Publisher
NERC EDS Environmental Information Data Centre		info@eidc.ac.uk	Custodian
Department for Environment, Food & Rural Affairs		defra.helpline@defra.gov.uk	Owner

GEMET - INSPIRE themes, version 1.0

• Environmental Monitoring Facilities

GEMET - Concepts, version 4.1.3

• critical load
• acidity

Keywords

• Nutrient Nitrogen

Access constraints

Other restrictions

Other constraints

no limitations

Use constraints

Other restrictions

Other constraints

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

Use constraints

Other restrictions

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© Crown copyright and database right

Use constraints

Other restrictions

Other constraints

If you reuse this data, you should cite: Rowe, E.C., Hina, N.S., Sawicka, K. (2022). Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2017-2019. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/049b5fd2-3f12-48fc-8b43-57fa4db649ae

Spatial representation type

Text, table

Distance

10  urn:ogc:def:uom:EPSG::9001

Language

English

Character set

UTF8

Topic category

• Environment

Begin date

2017-01-01

End date

2019-12-31

Unique resource identifier

OSGB 1936 / British National Grid

Distribution format

Name	Version
Comma-separated values (CSV)

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS Environmental Information Data Centre		info@eidc.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
	https://data-package.ceh.ac.uk/data/049b5fd2-3f12-48fc-8b43-57fa4db649ae	Download the data

OnLine resource

Protocol	Linkage	Name
	https://data-package.ceh.ac.uk/sd/049b5fd2-3f12-48fc-8b43-57fa4db649ae.zip	Supporting information

Hierarchy level

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 United Nations Economic Commission for Europe (UNECE) exceedance Transboundary Air Pollution ( https://www.umweltbundesamt.de/en/Coordination_Centre_for_Effects ). 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 5x5 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 (2015) (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.

Metadata

File identifier

049b5fd2-3f12-48fc-8b43-57fa4db649ae XML

Metadata language

English

Character set

8859 Part 1

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2025-11-13T16:20:22

Metadata standard name

UK GEMINI

Metadata standard version

2.3

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS Environmental Information Data Centre		info@eidc.ac.uk	Point of contact