INTERNATIONAL AIR QUALITY ADVISORY BOARD
MODELING OF ATMOSPHERIC MERCURY TRANSPORT AND DEPOSITION TO THE
GREAT LAKES BASIN USING THE NOAA-HYSPLIT MODEL
The IAQAB recommends the following to the IJC:
Every effort should be made to increase the detail, particularly on speciation of mercury, and accuracy
associated with emissions inventories in the United States, Canada, and on a global basis. Some coordina-
tion in the production of inventories between the United States and Canada, resulting in largely seamless
inventories applicable to the same base year, would be most helpful.
Additional detailed ambient monitoring activities, including the completion of enhancements to the
recently established mercury measurement capabilities of the Integrated Atmospheric Deposition Net-
work, should be supported, and provisions should be put in place to make all completed measurements
available in a timely fashion.
A mercury modeling intercomparison study in North America, similar to that currently underway in
Europe, could stimulate improvements while increasing confidence in the outcomes and linkages devel-
oped by atmospheric transport models. Improvements to the emissions data base and assembly of a
comprehensive ambient measurement data set should be part of this model intercomparison.
Following model intercomparison and comparison against measured data, these models should be used
as a predictive tool in determining the potential impact on deposition of proposed mercury emission
control programs currently under consideration in the United States and Canada.