Multiscale Comparison Of Air Quality Modeling
For An Ozone Occurrence During The 1996
Paso Del Norte Ozone Campaign
Author(s)
D. Lu, R. S. Reddy, R. Fitzgerald, W. R. Stockwell,
Q. L. Williams & P. B. Tchounwou
Abstract
An air quality modeling has been applied to investigate an ozone event occurring
during the period of 1996 Paso del Norte Ozone Campaign. An examination of
model sensitivity to horizontal grid resolutions has been performed. The
modeling results show that grid resolution evidently influences the simulations
of ozone formation, dispersion, transportation and structural distribution. The
36-, 12-, 4- and 1-km models captured the diurnal variation of surface ozone, but
with a few hours lag for simulated peak ozone. The coarser the spatial resolution
of the model, the more the peak ozone lag occurs. All models underpredicted the
peak ozone concentration where the 1-km model produced the best while the 36-
km model yielded the worst. This study suggests that the problems of maximum
ozone underprediction and minimum ozone overprediction can be mitigated by
increasing the spatial resolution of the model. Compared to fine models, coarse
models provided rather simple and smooth structures with many detailed and
complex structures being lost. The frequency distribution analysis also revealed
that the high ozone event occurring over the complex terrain area such as
El Paso, TX can hardly be captured by using coarse spatial resolution models,
and the high resolution model (i.e., grid spacing is no greater than 4-km)
is necessary.
Keywords
air quality modeling, multiscale comparison, high ozone event, CMAQ, SMOKE, WRF
Related Book
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