J.B. Gilman, D. Bon, W.C. Kuster, J.A. de Gouw, B.M. Lerner, and E.J. Williams NOAA Earth System Research Laboratory CIRES at Univ. of Colorado, Boulder,

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Presentation transcript:

J.B. Gilman, D. Bon, W.C. Kuster, J.A. de Gouw, B.M. Lerner, and E.J. Williams NOAA Earth System Research Laboratory CIRES at Univ. of Colorado, Boulder, CO 1.VOC Instrumentation 2.Airmass classifications and characterization 3.Comparison of CalNex VOC datasets 4.Oxidation chemistry Atlantis from WP-3D Photo: S. Lance

R/V Atlantis GC-FID o GC-FID: C2 – C8 Hydrocarbons, Benzene, Toluene 5 min average every 30 min o PTR-TOF-MS: Aromatics, OVOCs, etc. in real time CalTech Site in Pasadena, CA GC-MS o GC-MS: C2 – C12 Hydrocarbons, Aromatics, OVOCS,... 5 min average every 30 min o PTR-IT-MS: Aromatics, OVOCs, etc. in real time o Several CIMS: Organic/Inorganic acids, etc. NOAA WP-3D WAS o WAS: C2 – C8 Hydrocarbons, Aromatics, etc. o PTR-MS: Aromatics, OVOCs, etc. in real time

CleanMarineUrbanOutflow Santa Monica BaySanta BarbaraSF Bay to Sacramento Transit North

Clean Marine: Low CO, NO x, Radon Low VOCs Small Toluene/Benzene ratio Typically < 1.0 Urban Outflow: Increased CO, NO x, Radon O 3 anti-correlates with NO x Increased VOCs, correlate with CO Larger Toluene/Benzene ratios Usually > 2.0 Atlantis Exhaust/Ship Air: Relative WD Large CO and NO Spike in Toluene, low VOCs Ship hits have been removed Northern CA LA Basin

Clean Marine: Low CO, NO x, Radon Low VOCs Small Toluene/Benzene ratio Typically < 1.0 Urban Outflow: Increased CO, NO x, Radon O 3 anti-correlates with CO, NO x Increased VOCs, correlate with CO Larger Toluene/Benzene ratios Usually > 2.0 Atlantis Exhaust/Ship Air: Relative WD Large CO and NO Spike in Toluene, low VOCs Ship hits have been removed

PropaneiButanenButanenPentane Clean Marine Northern CA LA Basin Pasadena, CA Median Mixing Ratios (ppbv) – LOG scale EthenePropene1-Butene EthyneBenzeneTolueneTol/Benz OzoneCONOx AlkanesAlkenes Tracers Other VOCs

VOCs (WP-3D) = D. Blake and E. Atlas

VOCs (WP-3D) = D. Blake and E. Atlas ; CO (WP-3D) = J. Holloway ; CO (Pasadena) = B. Lefer All 3 platforms show similar trends for urban/combustion tracers All 3 platforms show similar trends for urban/combustion tracers

Marine tracers (e.g., DMS) were Marine tracers (e.g., DMS) were measured at the inland sites measured at the inland sites All three data sets will provide valuable information regarding transport and processing 10% 20% Wind Rose for Pasadena, CA Warm colors = higher WS (m/s) Wind

Oxidation of VOCs can lead to the production of O 3 VOCs react with OH and Cl - d[VOC]/dt = k OH [OH]+k Cl [Cl] [OH] >> [Cl] k OH < k Cl Changes in VOC ratios can be used to decipher oxidation chemistry Ratios are less sensitive to mixing and dilution than absolute mixing ratios Ethane Propane iso-Butane n-Butane iso-Pentane n-Pentane Ethane Propane iso-Butane n-Butane iso-Pentane n-Pentane Benzene Acetylene Benzene Acetylene Reaction Rate Coefficients (cm 3 molec -1 s -1 ) k OH × k Cl × Parrish, et al. (1992), Helmig, et. al (2008)

2008 IPY decreases in: [n-Butane]/[i-Butane]  Cl [n-Butane]/[i-Butane]  Cl [Acetylene]/[Benzene]  Cl + Br [Acetylene]/[Benzene]  Cl + Br - - Well mixed air masses - OH oxidation was negligible - OH oxidation was negligible 2008 IPY decreases in: [n-Butane]/[i-Butane]  Cl [n-Butane]/[i-Butane]  Cl [Acetylene]/[Benzene]  Cl + Br [Acetylene]/[Benzene]  Cl + Br - - Well mixed air masses - OH oxidation was negligible - OH oxidation was negligible 2010 CalNEX: - Influence of local sources - Influence of local sources - Mixing of air masses of varying - Mixing of air masses of varying photochemical ages photochemical ages - OH oxidation is NOT negligible - OH oxidation is NOT negligible 2010 CalNEX: - Influence of local sources - Influence of local sources - Mixing of air masses of varying - Mixing of air masses of varying photochemical ages photochemical ages - OH oxidation is NOT negligible - OH oxidation is NOT negligible Gilman, et al. [2010]

Air mass classifications and characteristics Clean Marine: [Toluene]/[Benzene] < 1.0 Urban Outflow: [Toluene]/[Benzene] > 2.0 Few interesting “intermediate” cases to look into VOC measurements from all platforms compare well VOC data sets will provide valuable insight regarding transport and degree of air mass processing transport and degree of air mass processing What’s next? Investigate the relative influence of OH and Cl oxidation chemistry in the processing of urban/marine air