Green, M. L.. University at Buffalo, mlgreen@eng.buffalo.edu
DePinto, J. L.. Great Lakes Program, University at Buffalo, depinto@eng.buffalo.edu
Sweet, C. Illinois State Water Survey,
Hites, R. A.. Indiana University,
Schwab, D. Great Lakes Environmental Research Laboratory/ NOAA,
Hornbuckle, K. C.. University of Iowa, kchorn@engineering.uiowa.edu

 
REGIONAL SPATIAL AND TEMPORAL INTERPOLATION OF PCBS: INTERPRETATION OF LAKE MICHIGAN MASS BALANCE ATMOSPHERIC DATA
 
Atmospheric samples were collected at eight stations around Lake Michigan and aboard the R/V Lake Guardian over fifteen months during the U.S. EPA's Lake Michigan Mass Balance Study (LMMB). The results of this sampling effort has been used to estimate gas-phase PCBs over the entire lake area by interpolating the concentrations in time and space. The temporal interpolation of the gas PCBs (sum of ~100 congeners) required a separation of the sampled air into two domains: a land based domain and a water base domain. This method was used to incorporate the different influences of temperature on air passing over land and water. A result of this temporal interpolation is a series of slopes for Clausius-Clapeyron type plots of ln Cg vs. 1/T. The spatial interpolation is an estimation of gas-phase PCBs for ~2000 grid squares of 25 km2 covering the lake, for every day between April 1994 and October 1995. A result of this spatial interpolation is an area of influence for gas-phase pollutants around Chicago. This area of influence is highly variable and increases with southerly air flow and air temperature.
 
Day: Friday, Feb. 5
Time: 02:15 - 02:30pm
Location: Eldorado Hotel
 
Code: SS48FR0230E