Therefore, the IWAQM is recommending that transformation and

deposition be actively modeled in order to reasonably estimate

the fate of pollutants undergoing long range transport.

The IWAQM recognizes that the chemical and depositional

algorithms have not been rigorously tested against field data.

Chemical and depositional algorithms do not readily lend

themselves to field evaluation due to their dependence on the

ambient conditions into which they are emitted and the

infeasibility of producing and releasing a unique, chemically

active tracer to assess chemical conversion and deposition on a

source by source basis. Given these limitations, it is not

likely that there will be such data available in the near

future. Therefore, proposing to use a technically credible

method to estimate the formation and deposition of secondary

pollutants, seems appropriate, and is the course recommended by

the IWAQM.

To be consistent with the current modeling guidance and to

attempt to adequately capture year-to-year variation in

meteorological conditions, the IWAQM is recommending that five

years of meteorological data be run with the MESOPUFF-II

analyses. There are some exceptions to this recommendation,

noted below.

One of the weaknesses of the MESOPUFF-II modeling system,

identified by the IWAQM, is the lack of treatment of terrain on

the air flow and the discontinuities in the mixing height

field. A meteorological processor, which uses a diagnostic

wind model and smooths out the mixing depth fields, has been

identified, but has not yet been thoroughly tested with the

MESOPUFF-II, and thus, is not being recommended at this time.

When this processor is ready for distribution, Appendix A will

be updated to include these enhancements. Until such time, the

MESOPUFF-II meteorological processor (MESOPAC) should be used.



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