Use of linked models to describe transport and distribution of trace metals in Boston Harbor and Massachusetts Bay

Transport of Cu and Pb in Boston Harbor and Massachusetts Bay was simulated using a previously developed three dimensional hydrodynamic model. The model has been used and refined over a period of 10 years and has proven to be a useful tool to simulate physical parameters in the Bay. In this study, trace elements are integrated into the hydrodynamic model to predict annual or monthly mean trace metal distributions in the water column. We verify model predicted results using historical and recent observational data in Boston Harbor and Massachusetts Bay, exploring the influence of key sources and sinks affecting trace metal distribution, and then link observed water column distributions to surface sediment concentrations of Cu using a dynamic sediment-water equilibrium model. Results of initial model runs for Cu compared well with observed surface sediment data. The linked models show promise as a powerful tool to better understand system responses to varying source strengths and biogeochemical processes controlling trace element transport, distribution and fate in coastal marine environments.