Regional and intercontinental modelling - Air Pollution Modeling and Its Application - page 138

Surface PM 2.5

Aerosol Optical Depth

30 0.60

0.48

24

0.36

18

0.24

12

Aerosol
optical
properties

0.12

6

0.00

0
ug/m3

Reduction in shortwave radiation
in regions of high aerosol loading

Reduction in PBL

Reduction in Shortwave Radiation

0

0

Changes in
radiation
impact
simulated
dynamics

-12

-20

-40 -24

-60 -36

-80 -48

-100 -60

W/m2

m

Fig. 2. Illustration of the direct radiative effects of aerosol simulated by the WRF-CMAQ
coupled model at 22 UTC on August 6, 2006

Fig. 3. Comparison of simulated shortwave radiation at the surface with and without direct
aerosol feedbacks with measurements at Bondville on August 6, 2006

Disclaimer Although this paper has been reviewed by EPA and approved for publication, it does
not necessarily reflect EPA's policies or views.

References

Byun, D.W., Schere, K.L., 2006. Review of the governing equations, computational algorithms,
and other components of the Models-3 Community Multiscale Air Quality (CMAQ)
modeling system. Appl. Mech. Rev ., 59, 51-77.
Pleim, J., J. Young, D. Wong, R. Gilliam, T. Otte, and R. Mathur, 2008, Two-Way Coupled
Meteorology and Air Quality Modeling, Air Pollution Modeling and Its Application XIX ,