Models-3/CMAQ Applications in California

1
Models-3/CMAQ Applications in California

• Ajith Kaduwela, Ph.D.
• Planning and Technical Support Division

2
Collaborators

• Emissions
• Paul Allen, P.E.
• Meteorology
• 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)
• Federal, state, local, and industry collaboration
• Based on the findings of IMS-95 (5 million)
• 27 million

4
Southern California Ozone Study Modeling
Aspirations
7 AQ Models x 3 Met Models x 3
Episodes x 2 Chemistries UAM MM5
Aug 04-07, 97
CB-IV UAM-FCM CALMET
Sep 29-31, 97 SAPRC99f CALGRID
MM5/CALMET Jul 14-19,
98 CAMx SAQM MAQSIP CMAQ
5
SCOS Modeling Domain in UTM
6
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
7
(No Transcript)
8
(No Transcript)
9
CAMx and CALGRID Performance Measures August 05,
1997
Zone 2 Zone 3 Zone 4 Zone 6 Zone 8 Obs.Max.
96 142 187 122 106 Model PR NB PR
NB PR NB PR NB PR NB CMAQ/CB4 0.91
-28 1.01 -24 0.91 11 1.21 -28 1.51
-21 CAMx/CB4 0.83 24 0.86 18 0.89 07 1.02
31 1.40 -21 CGD/CB4 0.87 28 0.94 09 0.86
06 1.20 18 1.18 -15 CMAQ/S99f 0.94 -23 0.95
-22 0.92 19 1.28 17 1.58 -11 CAMx/S99f 0.74
28 0.82 21 0.90 05 1.10 24 1.36
-27 CGD/S99f 1.15 04 1.08 08 0.92 20 1.33
02 1.25 05
Numbers in bold type meet USEPA (1991) model
performance guidelines
PR is peak ratio, and NB is normalized bias.
10
Model Performance measures of NOx and CO August
5, 1997
Zone 4 Zone 5 Zone 5 O3 NOx
CO Model PR NB PR NB PR
NB CMx/CB4 0.89 07 1.66 40 1.21
-13 CGD/CB4 0.86 06 1.47 46 1.16
00 CMx/S99f 0.90 05 1.68 43 1.20
-17 CGD/S99f 0.92 20 1.13 22 0.96 -18
PR is peak ratio, and NB is normalized bias.
11
Southern California Toxic Air Contaminants Modelin
g Aspirations
3 AQ Models x 2 Met Models x 1
Episode x 1 Chemistry UAM-FCM MM5
1998 SAPRC99fTAC CALGR
ID CALMET CMAQ
12
Ventura
San Bernardino
Los Angeles
Riverside
Orange
San Diego
Mexico
Regional Domain for Toxics Modeling
13
Domain Peak 1-hr Ozone (ppb)
August 1998
14
Peak O3
CGD Aug3 _at_ 13 hrs
CGD Aug2 _at_ 14 hrs
CMAQ Aug 2 _at_ 17 hrs
CMAQ Aug 3 _at_ 16 hrs
15
Performance for Toxics
16
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