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Abstract. Multi-scale tracer and full-chemistry simulations with the STEM atmospheric chemistry model are used to analyze the effects of transported background ozone (O 3 ) from the eastern Pacific on California air quality during the ARCTAS-CARB experiment conducted in June, 2008. Previous work has focused on the importance of long-range transport of O 3 to North America air quality in springtime. However during this summer experiment the longrange transport of O 3 is also shown to be important. Simulated and observed O 3 transport patterns from the coast to inland northern California are shown to vary based on meteorological conditions and the O 3 profiles over the oceans, which are strongly episodically affected by Asian inflows. Analysis of the correlations of O 3 at various altitudes above the coastal site at Trinidad Head and at a downwind surface site in northern California, show that under long-range transport events, high O 3 air-masses (O 3 >60 ppb) at altitudes between about 2 and 4 km can be transported inland and can Correspondence to: M. Huang (mhuang1@engineering.uiowa.edu) significantly influence surface O 3 20-30 h later. These results show the importance of characterizing the vertical structure of the lateral boundary conditions (LBC) needed in air quality simulations. The importance of the LBC on O 3 prediction during this period is further studied through a series of sensitivity studies using different forms of LBC. It is shown that the use of the LBC downscaled from RAQMS global model that assimilated MLS and OMI data improves the model performance. We also show that the predictions can be further improved through the use of LBC based on NASA DC-8 airborne observations during the ARCTAS-CARB experiment. These results indicate the need to develop observational strategies to provide information on the three-dimensional nature of pollutant distributions, in order to improve our capability to predict pollution levels and to better quantify the influence of these Asian inflows on the US west coast air quality.

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