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Ozone and Aerosols in US and East Asia between 2001 and 2002. Yun-Fat Lam 1 , Joshua S. Fu 1 , Zuopan Li 1 , Carey Jang 2 , Rokjin Park 3 and Daniel J. Jacob 3. 1. The University of Tennessee, Knoxville 2. USEPA/Office of Air Quality Planning & Standards 3. Harvard University. GEOS-Chem
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Ozone and Aerosols in US and East Asia between 2001 and 2002 Yun-Fat Lam1, Joshua S. Fu1, Zuopan Li1, Carey Jang2, Rokjin Park3 and Daniel J. Jacob3 1. The University of Tennessee, Knoxville 2. USEPA/Office of Air Quality Planning & Standards 3. Harvard University
GEOS-Chem Global scale model 20 to 55 vertical layers 2 x 2.5 degree resolution (Max. 1 x 1) CMAQ Regional scale model 14 to 16 vertical layers 18’ x 18’ resolution (36 km domain resolution) Coupling GEOS-Chem & CMAQ • GEOS-Chem simulations (2001 and 2002) are conducted by Rokjin Park at Harvard U. • The output results are used for the input data for CMAQ model
Initial Condition Processor (ICON) GISS GCM Model GEOS-Chem Output Meteorology-Chemistry Interface Processor Boundary Condition Processor (BCON) Interface processor Gridded Emissions Or SMOKE Photolysis Rate Processor (JPROC) Meteorology-Chemistry Interface Processor CMAQ Chemical Transport Model (CCTM) The CMAQ Chemical Transport Model (CCTM) Initial Condition Processor (ICON) Boundary Condition Processor (BCON)
Interface processor • Handle geo-spacial differences between two models. (e.g. projection system) • Convert chemical species (may or may not compactable) • Interpolate species concentration based on the vertical layer profiles ( 55 Vs. 14 layers)
Species Map for Ozone & PM2.5 2001 data 2002 data * EPA/ORD added these species in the table from the list of species in the GEOS-CHEM chemical mechanism Blue color highlighted tracers are GEOS-Chem new tracers
Species Calculation- CMAQ • Calculation of PM2.5 PM25 = ASO4I+ASO4J+ANO3I+ANO3J+ANH4I+ ANH4J+AORGAI+AORGAJ+(1.167*AORGPAI)+(1.167*AORGPAJ)+AORGBI+AORGBJ+AECI+AECJ+A25I+A25J • Calculation of O3 O3 = Ox - NOx
Output from the GEOS-Chem/CMAQ Interface Processor • ICON and BCON data was generated using the interface processor for both 2001 & 2002 GEOS-Chem output data • Additional 2001 and 2002 gridded data (Gd-data) was generated for QA 2002 Gd-data 2001 Gd-data Interface Processor BCON ICON
Gd-data for 2001 and 2002 * These values was determined using the species table
Vertical profile Vs. Average O3 (2002 BCON) WEST EAST SOUTH NORTH
Vertical profile Vs. Average O3 (BCON) Month of June
IC/BC for US Domain from GEOS-Chem Results GEOS-CHEM IC GEOS-CHEM BC
IC for CN Domain from GEOS-Chem and Profile Profile IC GEOS-CHEM IC
Simulations • Simulations with different IC/BC • Simulation 1: with Profile IC/BC(Regular CMAQ run) • Simulation 2: with GEOS-Chem IC/BC • Domain: cn36 • Episode: July 01-31, 2001 (spin-out: 5 days)
Monthly Maximum (O3) GEOS-CHEM IC/BC Difference Profile IC/BC GEOS-Chem IC/BC generate higher O3 concentrations around Beijing Areas
Monthly Average (PM2.5) Profile IC/BC GEOS-Chem IC/BC Difference GEOS-Chem IC/BC run does get a little bit higher PM2.5 values than the profile run around the Beijing area ( 1 – 2 ug/m3)
Summary • The ozone concentration, as well as the concentration profile with respected to elevation is similar between 2001 and 2002. • More tracers are used in 2002. This may contributed to the increased trends of PM2.5 from 2001 to 2002. • The GEOS-Chem/CMAQ Interface can provide CCTM IC/BC inputs from GEOS-Chem simulation results, and CCTM runs smoothly with the GEOS-Chem IC/BC inputs • The output demonstrated apparently different monthly maximum O3 results between the simulation using profile IC/BC and the simulation using GEOS-Chem IC/BC. Results also shows a slight increasing trend of PM2.5 values.
Acknowledgement • USEPA’s STAR and ICAP financial support • NCAR's supports of computing resources through projects #35991003 and #35991004 • Collaborators in EPA/OAQPS and EPA/ORD