Application of Linkage between GEOSCHEM and CMAQ

1
IMAQS
Application of Linkage between GEOS-CHEM and CMAQ
to investigate the impact of trans-boundary
transport of carbonaceous aerosols on the air
quality over the United States
Hee-Jin In, Nan-kyoung Moon, Soontae Kim, Daewon
W. Byun, and Sharon Zhong
Institute for Multidimensional Air Quality
Studies, University of Houston
Collaboration with Rokjin J. Park and Daniel J.
Jacob (Harvard University)
Model description
Daily concentrations of Simulated vs. Observed
EC
Objectives
Daily concentrations of Simulated vs. Observed
OC
IMPROVE monitoring sites
IMPROVE monitoring sites
Domain Continental U.S. 36 km x 36 km
(133 x 91 x 23 ) Meteorological
Simulation MM5 using Eta (40 km) as Init.
and Boundary value MCIP ver. 2.2 Emission
data processed by SMOKE using NEI 99 CMAQ
version 4.3 - CB4 - MEBI
solver - AERO3
During April through June 1998, smoke produced by
the fires of Mexico and Central America resulted
from dryness and drought condition was
transported northward, where it eventually
affected the U.S. This transport of smoke event
was simulated at the U.S. continent domain with
CMAQ. To improve the boundary value treatment,
global simulation (GEOS-CHEM) was linked to
regional model (CMAQ). 3-hourly GEOS-CHEM results
were used as the boundary condition during the
CMAQ simulation. The impact of trans-boundary
aerosols on the air quality of U.S. was
investigated.
Upper Buffalo Wilderness
Upper Buffalo Wilderness
Monthly mean simulated vs. observed EC
concentrations at 44 improve sites
Monthly mean simulated vs. observed OC
concentrations at 44 IMPROVE sites
Big Bend Natl Park
Big Bend Natl Park
R2 0.71
R2 0.67
CMAQ simulation of EC concentration using
GEOS-CHEM as Boundary Value
Previous study for event
CMAQ simulation of OC concentration using
GEOS-CHEM as Boundary Value
TOMS Aerosol Index
Big Bend Natl Park
Time-Height Cross-sectional distribution of
EC concentration
May 15 1998
Upper Buffalo Wilderness
May 16 1998
May 1998
Aerosol extinction coefficient
May 17 1998
GEOS-CHEM simulation (Park et al., 2003)
Global 3- dimensional model ( 2.5 x
2.0) (http//www-as.harvard.edu/chemistry/trop/ge
os/index.html)
Annual mean concentration of EC and OC at the
surface in 1998
May 18 1998
Institute for Multidimensional Air Quality Studies