| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB93-236495 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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 |
