Regional air-quality forecasting for the Pacific Northwest using MOPITT/TERRA assimilated carbon monoxide MOZART-4 forecasts as a near real-time boundary condition F. L. Herron-Thorpe1, G. H. Mount1, L. K. Emmons2, B. K. Lamb1, S. H. Chung1, and J. K. Vaughan1 1Department of Civil & Environmental Engineering, Washington State University, USA 2National Center for Atmospheric Research, Boulder, CO, USA
Abstract. Results from a regional air quality forecast model, AIRPACT-3, were compared
to AIRS carbon monoxide column densities for the spring of 2010 over the
Pacific Northwest. AIRPACT-3 column densities showed high correlation
(R > 0.9) but were significantly biased (~25%)
with consistent under-predictions for spring months when there is significant
transport from Asia. The AIRPACT-3 CO bias relative to AIRS was eliminated
by incorporating dynamic boundary conditions derived from NCAR's MOZART
forecasts with assimilated MOPITT carbon monoxide. Changes in ozone-related
boundary conditions derived from MOZART forecasts are also discussed and
found to affect background levels by ± 10 ppb but not found to
significantly affect peak ozone surface concentrations.
Citation: Herron-Thorpe, F. L., Mount, G. H., Emmons, L. K., Lamb, B. K., Chung, S. H., and Vaughan, J. K.: Regional air-quality forecasting for the Pacific Northwest using MOPITT/TERRA assimilated carbon monoxide MOZART-4 forecasts as a near real-time boundary condition, Atmos. Chem. Phys., 12, 5603-5615, doi:10.5194/acp-12-5603-2012, 2012.