Ambient%20Reconcile

Ambient%20Reconcile - » abundant in gasoline (7.5 and 5.8...

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Motor Vehicle VOC Emissions California EMFAC model predictions for Sacramento in summer 2001
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Exhaust vs. Evaporative VOC Emission mechanism affects: » » Temperature dependence of emissions » Control strategies How do evaporative emissions vary with T and time of day? Approach: reconcile ambient VOC with emission source profiles
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VOC Measurements » Granite Bay (near Folsom Lake) » 8 weeks during summer 2001 Online GC with 45-min time resolution 1. FID channel: C 3 -C 6 2. MS channel: BTEX, terpenes, oxygenated & chlorinated organics
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Granite Bay, California
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VOC Time Series Granite Bay: 18 July - 15 Sept 2001
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Alkanes in Gasoline Oil refiners isomerize C 5 -C 6 alkanes: » n-pentane (62) isopentane (93) » n-hexane (31) methylpentanes (74-76)
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Unformatted text preview: » abundant in gasoline (7.5 and 5.8 wt%) » not very reactive in the atmosphere Isopentane greatly enriched in vapor emissions relative to methylpentanes » 27 vs. 6.5 wt% in vapors Chemical Mass Balance Results Vapor Contribution vs. T 0.66 Weekdays only; 3-4 PM Main Findings Vapor pressure-driven emissions account for 17 ± 1% of vehicular VOC (daytime avg @ Granite Bay in 2001) Vapor contribution peaks 2-4 PM Vapor contribution correlated with T during afternoon hours Reference: Rubin et al. ( JGR 2006) Ambient CO & NO x Parrish et al. ( JGR 2002) Weekly Cycle in OC/EC Harley et al. ( ES&T 2005) PM 2.5 in Los Angeles Daily filter data from 5 sites (Kim et al., J. A&WMA , 2000) Harley et al. ( ES&T 2005)...
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This note was uploaded on 09/17/2009 for the course CE 108 taught by Professor Harley during the Fall '09 term at Berkeley.

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Ambient%20Reconcile - » abundant in gasoline (7.5 and 5.8...

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