1. General Model Information

Name: CL_NE-BAVARIA - critical loads model for NE Bavaria

Acronym: CL_NE_BAVARIA


Main medium: terrestrial
Main subject: biogeochemistry
Organization level: landscape, ecosystem-complexes
Type of model: not specified, static-algebraic equations
Main application: decision support/expert system
Keywords: critical load, critical levels, nitrogen deposition,proton deposition, soil acidification, forest ecosystems, forest decline, spatially distributed, GIS-based, empirical equations

Contact:

Romanus Lenz
GSF- National Research Center for Environment and Health
Project group for the potential threat to the environment posed by chemicals

P. O. Box 1129
85758 Oberschleissheim, Germany
Phone: +49-89-3187-2954
Fax : +49-89-3187-3369
email: Email:lenz@gsf.de

Author(s):

Dr. Romanus Lenz
CL_NE-BAVARIA is supported by:
Bundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie (BMBF)

Abstract:

contents of the model
The model estimates critical loads of proton and nitrogen in forest ecosystems, i.e. other ecosystems are NOT included. A critical load has been defined as "the highest deposition of a compound that will not cause chemical changes leading to long-term harmful effects on ecosystem structure and function" (Nilsson 1986).
First, certain physical and chemical properties of an ecosystem describing its sensitivity to the pollutant under discussion must be measured or estimated. This information on ecosystem sensitivity can be compared with present pollutant deposition data, to determine which areas currently receive deposition levels which exceed the area's critical laod. These areas of exceedance indicate where present levels of pollutant deposition increase
Principles of the model
The required physical and chemical properties of an ecosystem describing its sensitivity to proton and nitrogen deposition include basic soil and forest management data which are available for larger areas. Many of them are available on digitized maps. Quantities (i.e. deposition and risks of ecosystem damage) are computed by relatively simple algebraic equations or by table functions, many of them being on an ordinal scale. Calculations are done employing the auto macro language (AML) of a commercially available geographic information system (ARC/INFO).

Author of Abstract: UFIS - Environmental Research Information System


II. Technical Information

II.1 Executables:

Operating System(s): Calculations are done employing the auto macro language(AML) of a commercially available geographic information system (ARC/INFO).

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

Complete model documentation: Lenz, R.: Charakteristika und Belastungen von Waldoekosystemen NO-Bayerns - eine landschaftsoekologische Bewertung auf stoffhaushaltlicher Grundlage, Berichte des Forschungszentrums Waldoeko, Reihe A, Band 80 (1991).

II.4 Data:



III. Mathematical Information


III.1 Mathematics

This is a list of model equations sorted by their characteristics with hypertext links for more details.


III.2 Quantities

This is a list of model quantities sorted by their characteristics with hypertext links for more details.


III.2.1 Input

III.2.2 Output


IV. References

Lenz, R., 1991. Charakteristika und Belastungen von Waldoekosystemen NO-Bayerns - eine landschaftsoekologische Bewertung auf stoffhaushaltlicher Grundlage Berichte des Forschungszentrums Waldoeko Reihe A, Band 80.



V. Further information in the World-Wide-Web


VI. Additional remarks

Additional information
Last review of this document by: R. Patzak : 1. October 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:40 CEST 2002

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