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Atmospheric Deposition of Pesticides to an Agricultural Watershed of the Chesapeake Bay

^a Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742
^b Environmental Quality Laboratory, USDA, Beltsville, MD 20705
^c Center for Environmental Science, University of Maryland, Horn Point Laboratory, Cambridge, MD 21613

View larger version (29K): [in a new window]   Fig. 1. Map of the Choptank River, Maryland illustrating water sample collection stations (stars), rain and air sampling sites (open circle), and the segmentation scheme of air–water gas exchange calculations including surface area and volume of water within each segment.

View larger version (32K): [in a new window]   Fig. 2. Atrazine, metolachlor, and chlorothalonil concentrations in (a) gas-phase air (pg m-3) and (b) dissolved-phase rain (ng L-1) for April to December 2000.

View larger version (37K): [in a new window]   Fig. 3. Comparison of total herbicides, total insecticides, and fungicide (chlorothalonil) wet deposition fluxes for 2000.

View larger version (30K): [in a new window]   Fig. 4. Gas-exchange flux (ng m-2 d-1) of metolachlor across the air–water interface of each segment (Fig. 1) of the Choptank River. Dates listed on the x axis represent the water sample collection date. Air sample concentrations used in the gas exchange calculation were an average of the two air samples bracketing the water sample collection date.