ATMOSPHERIC TRANSPORT AND DEPOSITION OF TRACE-ELEMENTS TO LAKE ERIE FROM URBAN AREAS

A hybrid receptor-deposition (HRD) modeling approach was used to deter mine the spatial and temporal variation in the ambient concentration a nd dry deposition flux of trace elements on fine (< 2.5 mm) and coarse (> 2.5 mm) particulate matter over Lake Erie. Upper-air observations from the National Weather Service (NWS) and ambient concentrations mea sured at two sampling sites downwind of major emission sources in the Lake Erie basin were input to the model. An evaluation of the depositi on flux of size-segregated trace elements to the lake during the over- water transport was performed. The average total (fine + coarse) depos ition flux was 9.6 ng/m(2)-h for V, 70 ng/m(2)-h for Mn, 3.2 ng/m(2)-h for As, 4.2 ng/m(2)-h for Se, 10 ng/m(2)-h for Cd, and 43.3 ng/m(2)-h for Pb. Copyright (C) 1996 IAWQ.