Environ. Sci. Techno/. 1995, 29, 2112-2122
E l k e k s to Lake Miihigan: A De9Qshn ch NICOLA PIRRONE AND GERALD J. KEELER* Air Quality Laboratory, The University of Michigan, Ann Arbor, Michigan 48109-2029 THOMAS M. HOLSEN Pritzker Department of Enuironmental Engineering, Illinois Institute of Technology, Chicago, Illinois 60616
A hybrid-receptor deposition modeling approach was utilized to estimate the dry deposition flux of size segregated particles to Lake Michigan during the Lake Michigan Urban Air Toxics Study (LMUATS) from July 8 to August 9, 1991. The model estimated the flux of trace elements associated with particles in the fine (52.5 p m ) and PMlO-coarse (2.5-10 pm) size range to Lake Michigan using ambient concentration measurements. The ensemble average deposition velocities for fine particles traversing Lake Michigan were found to vary considerably, by factors of 3-15. The average deposition velocities for PM10-coarse particles vary by factors of
