EPA Science Inventory

Global and Local Contributions to Mercury Concentrations in Lake Michigan and Impact on Fish Consumption Advisories

Citation:

ZHANG, X., K. R. RYGWELSKI, M. D. ROWE, R. ROSSMANN, AND R. G. KREIS. Global and Local Contributions to Mercury Concentrations in Lake Michigan and Impact on Fish Consumption Advisories. Presented at International Conference on Great Lakes Research (IAGLR), Duluth, MN, May 30 - June 03, 2011.

Description:

LM2-Mercury, a mercury species mass balance model developed for Lake Michigan, was used to assess mercury cycling in Lake Michigan. A calibrated model (including a hindcast) was used to predict mercury concentrations in the lake based on various sensitivity and management scenarios. The model results indicate that atmospheric components including wet deposition, dry deposition, and mercury absorption are very important in controlling the mercury concentrations in the lake. Based on two very different global background scenarios, the model was used to investigate the relative importance of global vs regional impacts to mercury concentrations in Lake Michigan. The model results for the global background scenario, based on information from the most recent literature, indicate that the global contribution could be the foremost controlling factor of the Hg concentrations in the lake. Model forecasts of total mercury concentrations in the water will be compared to EPA 2001 fish consumption criteria. Although post-audit data are limited, model predictions appear to compare well to measured mercury concentrations.

Purpose/Objective:

LM2-Mercury, a mercury species mass balance model developed for Lake Michigan, was used to assess mercury cycling in Lake Michigan. A calibrated model (including a hindcast) was used to predict mercury concentrations in the lake based on various sensitivity and management scenarios. The model results indicate that atmospheric components including wet deposition, dry deposition, and mercury absorption are very important in controlling the mercury concentrations in the lake. Based on two very different global background scenarios, the model was used to investigate the relative importance of global vs regional impacts to mercury concentrations in Lake Michigan. The model results for the global background scenario, based on information from the most recent literature, indicate that the global contribution could be the foremost controlling factor of the Hg concentrations in the lake. Model forecasts of total mercury concentrations in the water will be compared to EPA 2001 fish consumption criteria. Although post-audit data are limited, model predictions appear to compare well to measured mercury concentrations.

URLs/Downloads:

5463KREIS.PDF   (PDF,NA pp, 51 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/ABSTRACT)
Start Date: 05/30/2011
Completion Date: 05/30/2011
Record Last Revised: 12/06/2012
Record Created: 02/16/2011
Record Released: 02/16/2011
OMB Category: Other
Record ID: 233343

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB

MID-CONTINENT ECOLOGY DIVISION

LARGE LAKES & RIVER FORECASTING RESEARCH