Book chapter
Wet and dry fluxes of Atrazine into Lake Michigan during the Lake Michigan mass balance study
IAGLR '99. International Association for Great Lakes Research: Great Lakes, Great Science, Great Cities. Program and Abstracts, pp.A-48
01/01/1999
Abstract
The corn and soybean belt of North America includes the Great Lakes region. It is therefore not surprising that Atrazine and other agricultural chemicals find their way into the waters of the five lakes. Identifying the routes of delivery and magnitude of various sources of Atrazine is one of the primary goals of the U.S. EPA's Lake Michigan Mass Balance Study. Previous studies have indicated that atmospheric deposition of Atrazine is about 20% of the total input of the chemical. During the LMMB, Atrazine was measured in air (gas and particle) and in rain. From these measurements, we have estimated whole lake atmospheric deposition. Most of the annual deposition flux is through rainfall ( similar to 1040 kg/yr). Dry particle deposition ( similar to 200 kg/yr) and gas exchange (0 to 440 kg/yr) deliver much less Atrazine. The source of the chemical in the rain is not clear. Gas scavenging of local air cannot account for the measure rain concentrations. We have considered three possible explanations for this result: 1) The collected gas-phase samples were not representative of air during a rain event; 2) Atrazine in rain is a result of very efficient particle scavenging and/or; 3) Atrazine in rain droplets is a result of volatilization from distant sources, gas scavenging, and subsequent in-cloud transport.
Details
- Title: Subtitle
- Wet and dry fluxes of Atrazine into Lake Michigan during the Lake Michigan mass balance study
- Creators
- K C HornbuckleS M Miller
- Resource Type
- Book chapter
- Publication Details
- IAGLR '99. International Association for Great Lakes Research: Great Lakes, Great Science, Great Cities. Program and Abstracts, pp.A-48
- Language
- English
- Date published
- 01/01/1999
- Academic Unit
- Civil and Environmental Engineering; Occupational and Environmental Health
- Record Identifier
- 9983997984702771
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