Isoprene and its oxidation products, methacrolein and methylvinyl ketone, at an urban forested site during the 1999 Southern Oxidants Study

Stroud, Craig; Roberts, J. M.; Goldan, P. D.; Kuster, W. C.; Murphy, P. C.; Williams, E. J.; Hereid, D.; Parrish, D. D.; Sueper, D.; Trainer, M.; Fehsenfeld, F. C.; Apel, E. C.; Riemer, D. D.; Wert, B.; Henry, Bruce; Fried, Alan; Martinez-Harder, Monica; Harder, Hartwig; Brune, William H.; Li, G.; Xie, Han; Young, V.

doi:10.1029/2000jd900628

Cited by 103 publications

(115 citation statements)

References 29 publications

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“…Methacrolein and MVK are major isoprene oxidation products (e.g., Montzka et al, 1993;Stroud et al, 2001;Karl et al, 2009b). The MAC and MVK mixing ratios were greater over the oil sands than at any other time during the flight (Fig.…”

Section: Oxygenated Hydrocarbonsmentioning

confidence: 99%

Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C2–C10 volatile organic compounds (VOCs), CO2, CH4, CO, NO, NO2, NOy, O3 and SO2

et al. 2010

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Abstract. Oil sands comprise 30% of the world's oil reserves and the crude oil reserves in Canada's oil sands deposits are second only to Saudi Arabia. The extraction and processing of oil sands is much more challenging than for light sweet crude oils because of the high viscosity of the bitumen contained within the oil sands and because the bitumen is mixed with sand and contains chemical impurities such as sulphur. Despite these challenges, the importance of oil sands is increasing in the energy market. To our best knowledge this is the first peer-reviewed study to characterize volatile organic compounds (VOCs) emitted from Alberta's oil sands mining sites. We present high-precision gas chromatography measurements of 76 speciated C 2 -C 10 VOCs (alkanes, alkenes, alkynes, cycloalkanes, aromatics, monoterpenes, oxygenated hydrocarbons, halocarbons and sulphur compounds) in 17 boundary layer air samples collected over surface mining operations in northeast Alberta on 10 July 2008, using the NASA DC-8 airborne laboratory as a research platform. In addition to the VOCs, we present simultaneous measurements of CO 2 , CH 4 , CO, NO, NO 2 , NO y , O 3 and SO 2 , which were measured in situ aboard the DC-8.Carbon dioxide, CH 4 , CO, NO, NO 2 , NO y , SO 2 and 53 VOCs (e.g., non-methane hydrocarbons, halocarbons, sulphur species) showed clear statistical enhancements (1.1-397×) over the oil sands compared to local background valCorrespondence to: I. J. Simpson (isimpson@uci.edu) ues and, with the exception of CO, were greater over the oil sands than at any other time during the flight. Twenty halocarbons (e.g., CFCs, HFCs, halons, brominated species) either were not enhanced or were minimally enhanced (<10%) over the oil sands. Ozone levels remained low because of titration by NO, and three VOCs (propyne, furan, MTBE) remained below their 3 pptv detection limit throughout the flight. Based on their correlations with one another, the compounds emitted by the oil sands industry fell into two groups: (1) evaporative emissions from the oil sands and its products and/or from the diluent used to lower the viscosity of the extracted bitumen (i.e., C 4 -C 9 alkanes, C 5 -C 6 cycloalkanes, C 6 -C 8 aromatics), together with CO; and (2) emissions associated with the mining effort, such as upgraders (i.e., CO 2 , CO, CH 4 , NO, NO 2 , NO y , SO 2 , C 2 -C 4 alkanes, C 2 -C 4 alkenes, C 9 aromatics, short-lived solvents such as C 2 Cl 4 and C 2 HCl 3 , and longer-lived species such as HCFC-22 and HCFC-142b). Prominent in the second group, SO 2 and NO were remarkably enhanced over the oil sands, with maximum mixing ratios of 38.7 ppbv and 5.0 ppbv, or 383× and 319× the local background, respectively. These SO 2 levels are comparable to maximum values measured in heavily polluted megacities such as Mexico City and are attributed to coke combustion. By contrast, relatively poor correlations between CH 4 , ethane and propane suggest low levels of natural gas leakage despite its heavy use at the surface mining sites. Instead the elevat...

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Section: Oxygenated Hydrocarbonsmentioning

confidence: 99%

Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C2–C10 volatile organic compounds (VOCs), CO2, CH4, CO, NO, NO2, NOy, O3 and SO2

et al. 2010

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“…The OH concentrations from the [MVK+MACR+ISOPOHH]/[Isoprene] ratio using the sequential reaction model were originally developed by Apel, 2002 andStroud et al, 2001 and modified according to the approach of Karl et al (2007). This method can be used to investigate the impact of vertical transport, representing the processing time of the isoprene and its oxidation products 205 from the surface to the atmosphere through the ratio of PBL depth and the convective velocity scale.…”

Section: Methods Description For the Oh Calculationmentioning

confidence: 99%

“…Motivated by the discrepancies between model and observation of OH production in the atmosphere and the influence of the biomass burning plumes in the isoprene reactivity with OH during the day, we propose in this study a refinement in the OH estimation method that has been applied by several previous studies (Apel, 2002;Karl et al, 2007;Kuhn et al, 2007;Stroud et al, 2001). …”

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confidence: 99%

Biomass burning emissions disturbances on the isoprene oxidation in a tropical forest

Charrua-Santos¹,

Longo²,

Kim³

et al. 2017

Preprint

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Abstract. We present a characterization of the chemical composition of the atmosphere of the Brazilian Amazon rainforest based on trace gases measurements carried out during the South American Biomass Burning Analysis (SAMBBA) airborne experiment in September 2012. We analyzed the observations of primary biomass burning emission tracers, i.e., carbon monoxide (CO) and 20 nitrogen oxides (NOx), ozone (O3), isoprene, and its main oxidation products, methyl vinyl ketone (MVK), methacrolein (MACR), and hydroxyhydroperoxides (ISOPOOH). The focus of SAMBBA was primarily on biomass burning emissions, but there were due to cloud edge effects on photolysis rates, which have a major impact on OH production rates.

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“…However, data in show that the concentrations of acetophenone and benzeneacetaldehyde seem to be anti-correlated with that of ethylbenzene, inconsistent with the consequence of parallel decay and dilution. In the present study and in Stroud et al (2001), two ratios that are partially dependent on each other are compared. This is a substantial change to the original applications (Bertman et al, 1995;Roberts et al, 1998Roberts et al, , 2001, which used independent ratios.…”

Section: Sequential Reaction Model and Photochemical Agementioning

confidence: 99%

GC×GC measurements of C7-C11 aromatic and n-alkane hydrocarbons on Crete, in air from Eastern Europe during the MINOS campaign

Williams

Plaß-Dülmer

et al. 2003

Atmos. Chem. Phys.

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Abstract. During the Mediterranean Intensive OxidantStudy (MINOS) campaign in August 2001 gas-phase organic compounds were measured using comprehensive twodimensional gas chromatography (GC×GC) at the Finokalia ground station, Crete. In this paper, C 7 −C 11 aromatic and n-alkane measurements are presented and interpreted. The mean mixing ratios of the hydrocarbons varied from 1±1 pptv (i-propylbenzene) to 43±36 pptv (toluene). The observed mixing ratios showed strong day-to-day variations and generally higher levels during the first half of the campaign. Mean diel profiles showed maxima at local midnight and late morning, and minima in the early morning and evening. Results from analysis using a simplified box model suggest that both the chemical sink (i.e. reaction with OH) and the variability of source strengths were the causes of the observed variations in hydrocarbon mixing ratios. The logarithms of hydrocarbon concentrations were negatively correlated with the OH concentrations integral over a day prior to the hydrocarbon measurements. Slopes of the regression lines derived from these correlations for different compounds are compared with literature rate constants for their reactions with OH. The slopes for most compounds agree reasonably well with the literature rate constants. A sequential reaction model has been applied to the interpretation of the relationship between ethylbenzene and two of its potential products, i.e. acetophenone and benzeneacetaldehyde. campaign are estimated using the sequential reaction model and related data. They lie in the range of about 0.5-2.5 days.

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Isoprene and its oxidation products, methacrolein and methylvinyl ketone, at an urban forested site during the 1999 Southern Oxidants Study

Abstract: Abstract. Isoprene (ISOP) and its oxidation products, methacrolein (MACR) and methyl vinyl ketone (MVK),

Cited by 103 publications

References 29 publications

Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C<sub>2</sub>–C<sub>10</sub> volatile organic compounds (VOCs), CO<sub>2</sub>, CH<sub>4</sub>, CO, NO, NO<sub>2</sub>, NO<sub>y</sub>, O<sub>3</sub> and SO<sub>2</sub>

Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C<sub>2</sub>–C<sub>10</sub> volatile organic compounds (VOCs), CO<sub>2</sub>, CH<sub>4</sub>, CO, NO, NO<sub>2</sub>, NO<sub>y</sub>, O<sub>3</sub> and SO<sub>2</sub>

Biomass burning emissions disturbances on the isoprene oxidation in a tropical forest

GC×GC measurements of C<sub>7</sub>-C<sub>11</sub> aromatic and n-alkane hydrocarbons on Crete, in air from Eastern Europe during the MINOS campaign

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Isoprene and its oxidation products, methacrolein and methylvinyl ketone, at an urban forested site during the 1999 Southern Oxidants Study

Abstract: Abstract. Isoprene (ISOP) and its oxidation products, methacrolein (MACR) and methyl vinyl ketone (MVK),

Cited by 103 publications

References 29 publications

Biomass burning emissions disturbances on the isoprene oxidation in a tropical forest

GC×GC measurements of C&lt;sub&gt;7&lt;/sub&gt;-C&lt;sub&gt;11&lt;/sub&gt; aromatic and n-alkane hydrocarbons on Crete, in air from Eastern Europe during the MINOS campaign

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GC×GC measurements of C<sub>7</sub>-C<sub>11</sub> aromatic and n-alkane hydrocarbons on Crete, in air from Eastern Europe during the MINOS campaign