A Model for Internal Chemical Loading in Lake Erie
Project Number: R/EM-021-PD, Completion Report
Start Date: 8/1/2000
Completion Date: 7/31/2001
Revision Date: 6/13/2007
| Principal Investigator(s) | 1. | Gerald Matisoff, Geological Sciences Case Western Reserve University* |
| Associate Investigator(s) | 2. | William Fornes, Case Western Reserve University* |
| This shows the current affiliation and may not match affiliation at time of participation. * | ||
Funding Record
| Source: Ohio Sea Grant College Program | |||
| Source Fund | State Match | Pass Through | |
| First Year | $ 7,500.00 | $ 7,500.00 | $ 0.00 |
| Total | $ 7,500.00 | $ 7,500.00 | $ 0.00 |
Objectives
Develop Model for internal loadings of nutrients and metals to Lake Erie
Adapt an existing model of sediment-water exchange developed for marine systems to the freshwater environment of the Great Lakes
Calibrate the model for several environments in Lake Erie.
Adapt an existing model of sediment-water exchange developed for marine systems to the freshwater environment of the Great Lakes
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.
Rationale
Methodology
- Adapt the CANDI model of sediment-water exchange developed for marine systems to the freshwater environment of the Great Lakes
- Calibrate the model for several environments in Lake Erie.
- Improve predictions of the internal chemical loading to Lake Erie.
Benefits & Accomplishments
Benefits:
The proposed work will be useful in recalculation of P loads and will be a significant improvement in ecosystem models.
The proposed work will be useful in recalculation of P loads and will be a significant improvement in ecosystem models.
Accomplishments:
The CANDI model was obtained, modified for freshwater sediments, and debugged. Crude calibration was completed. Proposal submitted and funded by EPA to collect cores from Lake Erie and analyzed for pore water chemistry. Data to be used for future model calibration. Model of oxygen developed and calibrated. Data to be presented at IAGLR 2003.
Publications & Media
| Peer-reviewed Publications | |
 | G. Matisoff and T. Neeson 2005, Oxygen Concentration and Demand in Lake Erie Sediments Journal of Great Lakes Research |
| Presentations | |
 | Fornes, W.L. and G. Matisoff. 2001, A model for sediment biogeochemical cycling and internal chemical loading in the Great Lakes 44th Conf. on Great Lakes Res., Green Bay, WI. |
| Matisoff, G. and Neeson, T. 2003, Quantifying Sediment-Oxygen Demand in Lake Erie 46th Conf. on Great Lakes Res., Intern. Assoc. Great Lakes Res., Chicago, IL. |
| Matisoff, G. 2004, Reaction transport modeling of sediment oxygen demand in Lake Erie sediments 47th Conf. on Great Lakes Res., Intern. Assoc. Great Lakes Res. |
| Matisoff, G., D.R. Aguilera and M. Thullner 2004, Reactive Transport Modeling of Sediment Oxygen Demand in Lake Erie Sediments Geochimica et Cosmochimica Acta, 2004 V.M. Goldschmidt Conference, Copenhagen, Denmark |
Supported Students
 | Dr. Bill Fornes (Graduate) Case Wesern Reserve University Title: CANDI model code debugging |
| Tom Neeson (Undergraduate, B.S.) Case Wesern Reserve University Title: Oxygen Model |
