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- W4238455331 abstract "Abstract. We quantify the sources contributing to background surface ozone concentrations in the US Intermountain West by using the GEOS-Chem chemical transport model with 1/2° × 2/3° horizontal resolution to interpret CASTNet ozone monitoring data for 2006–2008. We isolate contributions from lightning, wildfires, the stratosphere, and California pollution. Lightning increases mean surface ozone in summer by 10 ppbv in the Intermountain West, with moderate variability; constraining the model source with flash rate observations is important. Using a daily wildfire inventory compiled from fire reports in the western US generates high-ozone events in excess of 80 ppbv in GEOS-Chem. The CASTNet observations show no evidence of such events. Models in general may overestimate ozone concentrations in fresh plumes because of inadequate fire plume chemistry. The highest ozone concentrations observed in the Intermountain West (>75 ppbv) in spring are associated with stratospheric intrusions. The model captures the timing of these intrusions but not their magnitude, reflecting numerical diffusion intrinsic to Eulerian models. This can be corrected statistically through a relationship between model bias and the model-diagnosed magnitude of stratospheric influence; with this correction, models may still be useful to forecast and interpret high-ozone events from stratospheric intrusions. We show that discrepancy between models in diagnosing stratospheric influence is due in part to differences in definition, i.e., whether stratospheric ozone is diagnosed as produced in the stratosphere (GEOS-Chem definition) or as transported from above the tropopause. The latter definition can double the diagnosed stratospheric influence in surface air by labeling as stratospheric any ozone produced in the troposphere and temporarily transported to the stratosphere. California pollution influence in the Intermountain West frequently exceeds 10 ppbv but is generally not correlated with the highest ozone events." @default.
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- W4238455331 date "2013-10-08" @default.
- W4238455331 modified "2023-10-15" @default.
- W4238455331 title "Sources contributing to background surface ozone in the US Intermountain West" @default.
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- W4238455331 doi "https://doi.org/10.5194/acpd-13-25871-2013" @default.
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