||The urban perspectives of acid rain : workshop summary /
Holdren, G. R. ;
Strickland, T. C. ;
Cosby, B. J. ;
Marmorek, D. ;
||ManTech Environmental Technology, Inc., Corvallis, OR. ;Virginia Univ., Charlottesville. Dept. of Environmental Sciences. ;Environmental and Social Systems Analysts Ltd., Vancouver (British Columbia).;Corvallis Environmental Research Lab., OR.;Department of Energy, Washington, DC.
|| Oak Ridge National Laboratory, U.S. Dept. of Energy,
||DE-AC05-84OR21400; EPA-68-C8-0006; EPA/600/J-93/260
Atmospheric circulation ;
Air pollution ;
Aquatic ecosystems ;
Terrestrial ecosystems ;
Inorganic nitrates ;
Mathematical models ;
Steady state ;
Statistical analysis ;
Damage assessment ;
Critical loads ;
||Research Triangle Park Library/RTP, NC
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||1 volume (various pagings) : illustrations, maps ; 28 cm
The critical loads approach is emerging as an attractive means for evaluating the effects of atmospheric deposition on sensitive terrestrial and aquatic ecosystems. Various approaches are available for modeling ecosystem responses to deposition and for estimating critical load values. These approaches include empirical and statistical relationships, steady-state and simple process models, and integrated-effects models. For any given ecosystem, the most technically sophisticated approach will not necessarily be the most appropriate for all applications; identification of the most useful approach depends upon the degree of accuracy needed and upon data and computational requirements, biogeochemical processes being modeled, approaches used for representing model results on regional bases, and desired degree of spatial and temporal resolution. Different approaches are characterized by different levels of uncertainty. If the limitations of individual approaches are known, the user can determine whether an approach provides a reasonable basis for decision making. Several options, including point maps, grid maps, and ecoregional maps, are available for presenting model results in a regional context. These are discussed using hypothetical examples for choosing populations and damage limits.
Cover title. "Sponsored by the Office of the Director, National Acid Precipitation Assessment Program." Workshop held Sept. 23-24, 1992, in Raleigh, N.C. Martin Marietta Energy Systems, Inc. Contract Number: DE-AC05-84OR21400 "June 1993"--Cover.