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A Model for Internal Chemical Loading in Lake Erie

Objectives:   ) Develop Model for internal loadings of nutrients and metals to Lake Erie 1) Adapt an existing model of sediment-water exchange developed for marine systems to the freshwater environment of the Great Lakes 2) Calibrate the model for several environments in Lake Erie.  Abstract:  Internal recycling of nutrients and contaminants from sediments is a well-recognized and important input to the water column. However, models of biogeochemical cycling are not well developed. To directly address this deficiency, we apply the CANDI model to improve predictions of internal chemical loading to the Great Lakes. The model considers kinetically controlled reactions including degradation of organic carbon by oxygen, Fe and Mn oxides, nitrate, sulfate and methanogenesis, carbonate dissolution, and pyrite formation and equilibrium reactions that govern pH. Results to be presented include the proportional effects of suboxic and anoxic reactions on organic carbon diagenesis, the effects of bioturbation on the release on nutrients to the water column, and the changes in nutrient fluxes from the sediments in response to changes in nutrient deposition fluxes.  

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Theoretical
Scale of Phenomena
Physical/Chemical
Impact of Pollutants
Nutrients, Including Phosphorus
Toxic Metals
Lake Basin Connecting Channels
Lake Erie
State Province
Ohio
Annex Numbers
Hazardous Polluting Substances - lists
Research & Development
Surveillance and Monitoring

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Great Lakes - St. Lawrence Region.