1. Models-3/CMAQ Applications in California
Ajith Kaduwela, Ph.D.
Planning and Technical Support Division
October 22, 2002
Models-3/CMAQ Workshop

2. Collaborators Emissions Meteorology Air Quality Paul Allen, P.E.
Shuming Du, Ph.D.
Kemal Gurer, Ph.D.
Daniel Chau, Ph.D
Air Quality
Bruce Jackson, M.S.
Luis Woodhouse, Ph.D.
Jinyou Liang, Ph.D.

3. California Air Quality Studies
1997 Southern California Ozone Study (SCOS)
Mostly Government funds ($5.5 million)
2000 Central California Ozone Study (CCOS)
Federal, state, local, and industry collaboration
~$10 million spent and ~$8 million needed
2000 California Regional Particulate-Matter Air Quality Study (CRPAQS)
Based on the findings of IMS-95 (~$5 million)
~$27+ million
October 22, 2002
Models-3/CMAQ Workshop

4. Southern California Ozone Study Modeling Aspirations
7 AQ Models x 3 Met Models x 3 Episodes x 2 Chemistries
UAM MM Aug 04-07, CB-IV
UAM-FCM CALMET Sep 29-31, SAPRC99f
CALGRID MM5/CALMET Jul 14-19, 98
CAMx
SAQM
MAQSIP
CMAQ
October 22, 2002
Models-3/CMAQ Workshop

5. Models-3/CMAQ Workshop
SCOS Modeling Domain in UTM
October 22, 2002
Models-3/CMAQ Workshop

6. SCOS Subregions for Air Quality Model Performance Analysis
Zone 7
Zone 8
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 9
Zone 6
Zone 0
SCOS Subregions for Air Quality Model
Performance Analysis
October 22, 2002
Models-3/CMAQ Workshop

7. Models-3/CMAQ Workshop
October 22, 2002
Models-3/CMAQ Workshop

8. Models-3/CMAQ Workshop
October 22, 2002
Models-3/CMAQ Workshop

9. CAMx and CALGRID Performance Measures August 05, 1997
Zone 2 Zone 3 Zone 4 Zone 6 Zone 8
Obs.Max
Model PR NB PR NB PR NB PR NB PR NB
CMAQ/CB
CAMx/CB – – –
CGD/CB – – –
CMAQ/S99f –
CAMx/S99f 0.74 – – –
CGD/S99f 1.15 – –
Numbers in bold type meet USEPA (1991) model performance guidelines
‘PR’ is peak ratio, and ‘NB’ is normalized bias.
October 22, 2002
Models-3/CMAQ Workshop

10. Model Performance measures of NOx and CO August 5, 1997
Zone Zone Zone 5
O3 NOx CO
Model PR NB PR NB PR NB
CMx/CB
CGD/CB
CMx/S99f
CGD/S99f
* ‘PR’ is peak ratio, and ‘NB’ is normalized bias.
October 22, 2002
Models-3/CMAQ Workshop

11. Southern California Toxic Air Contaminants Modeling Aspirations
3 AQ Models x 2 Met Models x 1 “Episode” x 1 Chemistry
UAM-FCM MM SAPRC99f+TAC
CALGRID CALMET
CMAQ
October 22, 2002
Models-3/CMAQ Workshop

12. Regional Domain for Toxics Modeling
Ventura
San Bernardino
Los Angeles
Riverside
Orange
San Diego
Mexico
Regional Domain for Toxics Modeling
October 22, 2002
Models-3/CMAQ Workshop

13. Domain Peak 1-hr Ozone (ppb) August 1998

14. Peak O3
CGD: 13 hrs
CGD: 14 hrs
CMAQ: Aug 17 hrs
CMAQ: Aug 16 hrs

15. Models-3/CMAQ Workshop
Performance for Toxics
October 22, 2002
Models-3/CMAQ Workshop

16. Models-3/CMAQ Workshop
Conclusions
In general, performance of CMAQ is consistent with that of other models
We may experience some limitations of CMAQ and IO/API
Efficiency of the code is a concern
Expect to enhance model capabilities, especially for PM
October 22, 2002
Models-3/CMAQ Workshop