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Definitions and abbreviations

Keywords 

Definitions of keywords and abbreviations under CLRTAP

Acid Neutralisation Capacity (ANC)

 

Ability of a solution to neutralise inputs of strong acid to a preselected equivalence. An important chemical parameter used in critical load calculations.

 

Acidification

 

The shift of an ecosystem in its physical characteristic towards higher acidity. Acidification is caused by anthropogenic input of acidifying compounds, manly sulphur and nitrogen compounds, into an ecosystem in excess of its ability to buffer the acidifying effects.

 

Base Cations

 

Sum of calcium, magnesium, sodium and potassium cations.

 

CCC

 

Chemical Coordinating Centre

 

CCE

 

Coordination Centre for Effects

 

CIAM

 

Centre for Integrated Assessment Modelling

 

CLRTAP

 

Convention on Long-range Transboundary Air Pollution

 

Critical Levels

 

Concentrations of pollutants in the atmosphere above which direct adverse effects on receptors, such as human beings, plants, ecosystem or materials may occur, according to present knowledge.

 

Critical Load

 

A quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur, according to present knowledge.

 

EMEP

 

European Monitoring and Evaluation Programme

 

EMEP-SB

 

Cooperative Programme for Monitoring and Evaluation of Long-range Transmission of Air Pollutants in Europe – Steering Body

 

Emission

 

The release of a substance from a point or diffuse source into the atmosphere.

 

Eutrophication

 

Anthropogenically caused build-up of nutrients that causes natural nutrient inbalance in an ecosystem and may alter its structure.

 

Ground-Level Ozone

 

Secondary ozone pollution, formed through photochemical processes in the atmosphere at the presence of nitrogen oxides, volatile organic compounds and sunlight.

 

ICP

 

International Cooperative Programme

 

MRC

 

Main Research Centre

 

MSC-E

 

Meteorological Synthesizing Centre – East

 

MSC-W

 

Meteorological Synthesizing Centre – West

 

NFCs

National Focal Centres

Nitrogen oxides

 

Are nitrogen oxide and nitrogen dioxide, expressed as NOx

 

PC

 

Programme Centre

 

PCC

 

Programme Coordination Centre

 

Receptors

 

An ecosystem, or part of an ecosystem of interest that is potentially impacted by pollutant concentrations or atmospheric deposition. Receptors under the Convention are also materials.

 

Reduced nitrogen compounds

 

Means ammonia and its reaction products.

 

SSMB (SMB)

 

Steady-State Mass Balance model (Simple Mass Balance model

 

TF

 

Task Force

 

TFEIP

 

Task Force on Emission Inventories and Projections

 

TFIAM

 

Task Force on Integrated Assessment Modelling

 

TFMM

 

Task Force on Measurement and Modelling

 

UNECE

 

United Nations Economic Commission for Europe

 

Volatile organic compounds (VOCs)

 

Are all organic compounds of an anthropogenic nature, other than methane, that are capable of producing photochemical oxidants by reaction with nitrogen oxides in the presence of sunlight.

 

WGE

 

Working Group on Effects

 

WGSR

 

Working Group on Strategies and Review

 

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