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STATISTICAL METHODOLOGY FOR EXPLORING ELEVATIONAL DIFFERENCES IN PRECIPITATION CHEMISTRY
Citation:
Warren, W., M. Bohm, AND D. Link. STATISTICAL METHODOLOGY FOR EXPLORING ELEVATIONAL DIFFERENCES IN PRECIPITATION CHEMISTRY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/036 (NTIS PB92144088).
Description:
A statistical methodology for exploring the relationships between elevation and precipitation chemistry is outlined and illustrated. he methodology utilizes maximum likelihood estimates and likelihood ratio tests with contour ellipses of assumed bivariate lognormal distributions used to assist in interpretation. he approach was illustrated using 12 NADP/NTN sites located in six study areas in the Wyoming and Colorado Rockies. hese sites are part of the Rocky Mountain Deposition Monitoring Project (RMDMP), which was initiated in 1986 to investigate the relationships between elevation and the chemistry of precipitation. he results indicate differences in sulfate concentrations between airsheds, between snow and rain, and between higher and lower elevations. n general, sulfate concentrations in snow are greater at lower elevations and this difference is independent of concentration. A similar relationship for rain was not well established. n addition there is evidence that, overall, the sulfate concentrations differed between the six study areas, although pairwise differences were not always significant.