1Department of Civil & Environmental Engineering, Washington State University, USA
2National Center for Atmospheric Research, Boulder, CO, USA
Received: 10 Dec 2011 – Published in Atmos. Chem. Phys. Discuss.: 02 Feb 2012
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.
Revised: 31 May 2012 – Accepted: 01 Jun 2012 – Published: 28 Jun 2012
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.