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OLS Field Name OLS Field Data
Main Title Sensitivity of Critical Load Estimates for Surface Waters to Model Selection and Regionalization Schemes.
Author Holdren, G. R. ; Strickland, T. C. ; Shaffer, P. W. ; Ryan, P. F. ; Ringold, P. L. ;
CORP Author ManTech Environmental Technology, Inc., Corvallis, OR. ;Oak Ridge National Lab., TN. Environmental Sciences Div. ;Oak Ridge National Lab., Grand Junction, CO. Environmental Sciences Div.;Corvallis Environmental Research Lab., OR.;Department of Energy, Washington, DC.
Publisher c1992
Year Published 1992
Report Number EPA-68-C-0006 ;DE-AC-0584OR21400; EPA/600/J-93/412;
Stock Number PB93-236495
Additional Subjects Air pollution ; Air water interactions ; Water pollution ; Surface waters ; Mathematical models ; Acidification ; Deposition ; Study estimates ; Ecosystems ; Regional analysis ; Sulfates ; Acid neutralizing capacity ; Comparison ; Performance evaluation ; Reprints ; Critical loads
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NTIS  PB93-236495 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/22/1993
Collation 13p
Abstract A critical load is the amount of atmospheric pollutant that can be deposited on a sensitive ecosystem without causing measurable, long-term degradation in ecosystem form or function. The authors compare several methods for making critical load estimates of SO4 deposition to lakes. The models were originally developed to address surface water acidification issues. Critical loads are computed here as the levels of deposition required to reduce surface water acid neutralizing capacities (ANC) from present values to either 25 microeq/L or 0 microeq/L. These end points were selected to provide a common basis for comparing critical load values obtained from the various models and are not intended to provide definitive critical load estimates. Differences in results are observed not only between models, but within models when slightly different approaches are used for estimating certain parameters. The interpretation of model results depends strongly on how systems are grouped regionally.
Supplementary Notes Pub. in Jnl. of Environmental Quality, v22 n2 p279-289 Apr-Jun 93. Also pub. as Oak Ridge National Lab., TN. Environmental Sciences Div. rept. no. ORNL/PUB-3914. See also PB93-212660. Prepared in cooperation with Oak Ridge National Lab., TN. Environmental Sciences Div., and Oak Ridge National Lab., Grand Junction, CO. Environmental Sciences Div. Sponsored by Corvallis Environmental Research Lab.,
NTIS Title Notes Journal article.
Title Annotations Reprint: Sensitivity of Critical Load Estimates for Surface Waters to Model Selection and Regionalization Schemes.
Category Codes 68D; 68A; 57H; 91A
NTIS Prices PC A03/MF A01
Primary Description 600/02
Document Type NT
Cataloging Source NTIS/MT
Control Number 330925888
Origin NTIS
Type CAT