Illustrated model performance metrics, available PM2.5 and O3 data, and evaluation

software tool. Suggested that air quality modeling should include model evaluation as

part of the system.

• Comparing performance metrics may not be enough since performance metrics often

show mixed response and it is possible for a better model to have poorer metrics (e.g.,

bias in met & emissions inputs). Diagnostic evaluation is needed to judge finer grid

performance since coarser grid may have compensating errors. But should we assume

that finer grid modeling always gives better simulations/physics?

• An example of VISTAS modeling (July 1999) showed differences of hourly sulfate and

its wet deposition between CMAQ results using 12-km and 36-km grids, possible due

to regional transport (wind speed & direction), precipitations/clouds, and numerical


• Recommended bias factor as the best metric for evaluating haze.

11. Wang, Z., et al.,” Comparison and Diagnostic Evaluation of Air Quality Models for

Particulate Matter: CAMx, CMAQ, CMAQ-MADRID”, National RPO Modeling Meeting,


• Conducted model evaluation based on 1999 SOS episode (6/29-7/10) EPRI modeling


• CAMx has higher positive bias than CMAQ and CMAQ-Madrid in predicting sulfate;

CMAQ underestimated nitrate and CAMx and CMAQ-MADRID overestimated


• All three models underestimated OM. However, there was no clear winner in model


• The three models responded differently to a 50% increase in ammonia emissions,

indicating a need to further look at the models’ responsiveness to changes in emissions.


n901 - n902 - n903 - n904 - n905 - n906 - n907 - n908 - n909 - n910 - n911 - n912 - n913 - n914 - n915 - n916 - n917 - n918 - n919 - n920 - n921 - n922 - n923 - n924 - n925 - n926 - n927 - n928 - n929 - n930 - n931 - n932 - n933 - n934 - n935 - n936 - n937 - n938 - n939 - n940 - n941 - n942 - n943 - n944 - n945 - n946 - n947 - n948 - n949 - n950


   Flag of Portugal 



 castellano: DISPER CUSTIC DESCAR RADIA    italiano:     


 français:    português:  






deutsch: DIS CUS  DES  RAD

castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  


 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD


français:  DIS CUS DES RAD