Comparative evaluation of the impact of WRFNMM and WRFARW meteorology on CMAQ simulations for O3 and

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Comparative evaluation of the impact of WRF/NMM
and WRF/ARW meteorology on CMAQ simulations for
O3 and PM2.5 during the 2006 TexAQS/GoMACCS
study Shaocai Yu, Rohit Mathur, Jonathan
Pleim, Daiwen Kang, Daniel Tong, Brian Eder,
Kenneth Schere, David Wong, George Pouliot,
S.T. Rao Atmospheric Sciences Modeling
Division, NERL, U.S. EPA, RTP, NC 27711. On
assignment from Science and Technology
Corporation, On assignment from Air Resources
Laboratory, NOAA Jeff McQueen, Pius Lee, Marina
Tsidulko, Youhua Tang, Paula Davidson   NOAA/NCEP
Environmental Modeling Center
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Testing Domain Summer 2006
This Study
Operational EUS 3x
Experimental CONUS 5x
265 grid cells
259 grid cells
CONUS 5x Domain
East 3x Domain
268 grid cells
442 grid cells
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Aug. 5 to 10
Tracks of ship
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• Results (preliminary)
• Operational evaluation for O3 at AIRNOW
  sites

NMM
ARW

• Very close

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• Results (preliminary)
• Operational evaluation for PM2.5 at AIRNOW
  sites

NMM
ARW

• Both underpredicted obs PM2.5 by 30

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• Results (preliminary)
• Time-series evaluation on ship

over Gulf of Mexico

• Gas species

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• Results (preliminary)
• Time-series evaluation on ship

over Gulf of Mexico
(Meteorological parameters)

• Mean

• ARW was slightly cooler than both NMM and Obs

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• Results (preliminary)
• Time-series evaluation at 9 PAMS sites

Conc. (ppb)

• Mean

• ARW higher for high O3 range

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• Results (preliminary)
• Time-series evaluation at PAMS sites

Conc. (ppb)

• Mean

• NMM has low CO Meteorological effect?

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• Results (preliminary)
• Time-series evaluation at PAMS urban sites

ppb

• Mean

• SO2 very scattered, over-predict low conc. but
  under-predict high conc.

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Contacts
Brian K. Eder email eder_at_hpcc.epa.gov
www.arl.noaa.gov/ www.epa.gov/asmdnerl
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• Results (PM2.5 SO42-, NH4) vertical profiles

Layer means for model and observations from the
aircraft (P3) during the 2006 TexAQS/GoMACCS
Daily Layer Means

• Over predicted SO42- aloft but under prediction
  at surface
• CB-4 chemical mechanism produces too much H2O2
  (Yu et al., 2007)

• The model under predicted NH4 both at the
  surface and aloft,

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• Results
• Time-series evaluation with ship data

over Gulf of Mexico

• Model underestimated SO42-, NH4, NO3- by -29,
  -41, -86, respectively

• Meteorological parameters

Mean
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• Results
• Standard CMAQ performance for SO2

Sulfur Dioxide 2002 Summer
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Tracks of P-3 flights
Tracks of ship