VISTAS Grid Resolution Sensitivity

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Presentation transcript:

VISTAS Grid Resolution Sensitivity Ralph Morris, Bonyoung Koo and Steven Lau ENVIRON International Corporation Gail Tonnesen, Zion Wang, Chao-Jung Chien University of California at Riverside T.W. Tesche and Dennis McNally Alpine Geophysics National RPO Modeling Meeting Denver, Colorado May 24-25, 2004

Grid Resolution Sensitivity Three VISTAS Phase I Episodes January 2002 July 1999 July 2001 MM5 PX_ACM(2) 36 km national RPO grid and 12 km Southeast US VISTAS Grid Examine Model Performance in VISTAS Southeast US Domain

VISTAS Phase I 36/12 km Domains

SO4 IMPROVE 36 km vs. 12 km January 2002 – SO4 July 1999 – SO4

WSO4 NADP 36 km vs. 12 km January 2002 – WSO4 July 1999 – WSO4

July 2001 36 km vs. 12 km July 2001 – SO4 IMPROVE July 2001 – WSO4 NADP

IMPROVE SO4 Fractional Bias and Error CMAQ 36 km and 12 km & CB4 and SAPRC99

IMPROVE NO3 Fractional Bias and Error CMAQ 36 km and 12 km & CB4 and SAPRC99

IMPROVE OC Fractional Bias and Error CMAQ 36 km and 12 km & CB4 and SAPRC99

Ozone Performance July 1999 Episode CMAQ and CAMx at 36 km and 12 km (CB4) CMAQ ozone performance degradation to under-estimation with finer grid CAMx ozone performance similar at 36 km and 12 km

CAMx 36/12/4 km Performance for MRPO June 18 – August 13, 2001 Episode Mean Normalized Bias Degradation in most gas-phase species with higher resolution Aerosol species stay same or improve

CAMx 36/12/4 km Performance for MRPO June 18 – August 13, 2001 Episode Mean Normalized Gross Error

Conclusions: Grid Resolution Sensitivity Effects of grid resolution on model performance is mixed Changes in precipitation patterns and magnitudes can have large effect locally Changes in transport patterns also can have big local effect (e.g., Jim Boylan’s analysis of sulfate clouds) 12 km grid technically superior for grid modeling than 36 km, but still does not resolve point sources and urban areas very well 12 km takes more CPU time than 36 km VISTAS Phase II annual modeling will use both 36 and 12 km grids