Atmospheric oxidation chemistry and ozone production: Results from SHARP 2009 in Houston, Texas

Ren, Xinrong; Duin, Diana van; Cazorla, M.; Chen, Shuang; Mao, J.; Zhang, Li; Brune, William H.; Flynn, James; Grossberg, N.; Lefer, B. L.; Rappenglück, Bernhard; Wong, Kam W.; Tsai, Catalina; Stutz, J.; Dibb, Jack E.; Jobson, B. T.; Luke, Winston T.; Kelley, Paul

doi:10.1002/jgrd.50342

Cited by 123 publications

(152 citation statements)

References 82 publications

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“…Details will be presented in a thorough radical study prepared by Ren et al (2012). These results are similar to those of Chen et al (2010) and Mao et al (2010) for the same site in September 2006.…”

Section: Comparison Between Measured Calculated and Modeled P (O 3 )supporting

confidence: 60%

Direct measurement of ozone production rates in Houston in 2009 and comparison with two estimation methods

et al. 2012

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Abstract. Net ozone production rates, P (O 3 ), were measured directly using the Penn State Measurement of Ozone Production Sensor (MOPS) during the Study of Houston Atmospheric Radical Precursors (SHARP, 2009). Measured P (O 3 ) peaked in the late morning, with values between 15 ppbv h −1 and 100 ppbv h −1 , although values of 40-80 ppbv h −1 were typical for higher ozone days. These measurements were compared against ozone production rates calculated using measurements of hydroperoxyl (HO 2 ), hydroxyl (OH), and nitric oxide (NO) radicals, called "calculated P (O 3 )". The same comparison was done using modeled radicals obtained from a box model with the RACM2 mechanism, called "modeled P (O 3 )". Measured and calculated P (O 3 ) had similar peak values but the calculated P (O 3 ) tended to peak earlier in the morning when NO values were higher. Measured and modeled P (O 3 ) had a similar dependence on NO, but the modeled P (O 3 ) was only half the measured P (O 3 ). The modeled P (O 3 ) is less than the calculated P (O 3 ) because the modeled HO 2 is less than the measured HO 2 . While statistical analyses are not conclusive regarding the comparison between MOPS measurements and the two estimation methods, the calculated P (O 3 ) with measured HO 2 produces peak values similar to the measured P (O 3 ) when ozone is high. Although the MOPS is new and more testing is required to verify its observations, the measurements in the SHARP field campaign show the potential of this new technique for contributing to the understanding of ozone-producing chemistry and to the monitoring of ozone's response to future air quality regulatory actions.

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Section: Comparison Between Measured Calculated and Modeled P (O 3 )supporting

confidence: 60%

Direct measurement of ozone production rates in Houston in 2009 and comparison with two estimation methods

et al. 2012

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“…In urban environments, measured HO 2 concentrations were sometimes found to agree with model predictions Emmerson et al, 2007; Published by Copernicus Publications on behalf of the European Geosciences Union. 96 M. M. Lew et al: Hydroperoxy radical in the atmosphere using laser-induced fluorescence 2009b; Michoud et al, 2012;Lu et al, 2013;Ren et al, 2013;Griffith et al, 2016), while other times the measurements were found to be both lower (George et al, 1999;Konrad et al, 2003) and higher than model predictions Ren et al, 2003;Emmerson et al, 2005;Kanaya et al, 2007a;Chen et al, 2010;Sheehy et al, 2010;Czader et al, 2013;Griffith et al, 2016). In forested environments, measured HO 2 concentrations were sometimes found to agree with model predictions (Tan et al, 2001;Ren et al, 2005Ren et al, , 2006 but were often found to be either lower (Carslaw et al, 2001;Kanaya et al, 2007bKanaya et al, , 2012Whalley et al, 2011;Mao et al, 2012;Griffith et al, 2013) or higher than model predictions (Carslaw et al, 2001;Kubistin et al, 2010;Kim et al, 2013;Hens et al, 2014).…”

Section: Introductionmentioning

confidence: 98%

Measurement of interferences associated with the detection of the hydroperoxy radical in the atmosphere using laser-induced fluorescence

2018

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Abstract.One technique used to measure concentrations of the hydroperoxy radical (HO 2 ) in the atmosphere involves chemically converting it to OH by addition of NO and subsequent detection of OH. However, some organic peroxy radicals (RO 2 ) can also be rapidly converted to HO 2 (and subsequently OH) in the presence of NO, interfering with measurements of ambient HO 2 radical concentrations. This interference must be characterized for each instrument to determine to what extent various RO 2 radicals interfere with measurements of HO 2 and to assess the impact of this interference on past measurements. The efficiency of RO 2 -to-HO 2 conversion for the Indiana University laser-induced fluorescencefluorescence assay by gas expansion (IU-FAGE) instrument was measured for a variety of RO 2 radicals. Known quantities of OH and HO 2 radicals were produced from the photolysis of water vapor at 184.9 nm, and RO 2 radicals were produced by the reaction of several volatile organic compounds (VOCs) with OH. The conversion efficiency of RO 2 radicals to HO 2 was measured when NO was added to the sampling cell for conditions employed during several previous field campaigns. For these conditions, approximately 80 % of alkene-derived RO 2 radicals and 20 % of alkane-derived RO 2 radicals were converted to HO 2 . Based on these measurements, interferences from various RO 2 radicals contributed to approximately 35 % of the measured HO 2 signal during the Mexico City Metropolitan Area (MCMA) 2006 campaign (MCMA-2006), where the measured VOCs consisted of a mixture of saturated and unsaturated species. However, this interference can contribute more significantly to the measured HO 2 signal in forested environments dominated by unsaturated biogenic emissions such as isoprene.

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“…This difference between oceanic and continental free troposphere vanishes in the upper troposphere, where O 3 production prevails (Klonecki and Levy, 1997;. Studies that infer net ozone production at least in part from in situ measurements are rare and often limited to the boundary layer (Ren et al, 2013;Liu et al, 2012;Sommariva et al, 2011;Kleinman et al, 2005;Kanaya et al, 2002;Kleinman, 2000;Zanis et al, 2000;Penkett et al, 1997;Cantrell et al, 1996). A number of studies based on aircraft measurements have been performed, using in situ O 3 , CO, NO x , volatile organic compounds (VOCs) and radiation measurements in combination with a box model to calculate HO x and RO x radical levels to study NOPR in the free troposphere (Kuhn et al, 2010;Kondo et al, 2004;Davis et al, 2003;DiNunno et al, 2003;Ko et al, 2003;Reeves et al, 2002;Olson et al, 2001;Schultz et al, 1999;Crawford et al, 1997a, b;Davis et al, 1996;Jacob et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Chemical processes related to net ozone tendencies in the free troposphere

et al. 2017

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Abstract. Ozone (O 3 ) is an important atmospheric oxidant, a greenhouse gas, and a hazard to human health and agriculture. Here we describe airborne in situ measurements and model simulations of O 3 and its precursors during tropical and extratropical field campaigns over South America and Europe, respectively. Using the measurements, net ozone formation/destruction tendencies are calculated and compared to 3-D chemistry-transport model simulations. In general, observation-based net ozone tendencies are positive in the continental boundary layer and the upper troposphere at altitudes above ∼ 6 km in both environments. On the other hand, in the marine boundary layer and the middle troposphere, from the top of the boundary layer to about 6-8 km altitude, net O 3 destruction prevails. The ozone tendencies are controlled by ambient concentrations of nitrogen oxides (NO x ). In regions with net ozone destruction the available NO x is below the threshold value at which production and destruction of O 3 balance. While threshold NO values increase with altitude, in the upper troposphere NO x concentrations are generally higher due to the integral effect of convective precursor transport from the boundary layer, downward transport from the stratosphere and NO x produced by lightning. Two case studies indicate that in fresh convective outflow of electrified thunderstorms net ozone production is enhanced by a factor 5-6 compared to the undisturbed upper tropospheric background. The chemistry-transport model MATCH-MPIC generally reproduces the pattern of observation-based net ozone tendencies but mostly underestimates the magnitude of the net tendency (for both net ozone production and destruction).

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Atmospheric oxidation chemistry and ozone production: Results from SHARP 2009 in Houston, Texas

Cited by 123 publications

References 82 publications

Direct measurement of ozone production rates in Houston in 2009 and comparison with two estimation methods

Direct measurement of ozone production rates in Houston in 2009 and comparison with two estimation methods

Measurement of interferences associated with the detection of the hydroperoxy radical in the atmosphere using laser-induced fluorescence

Chemical processes related to net ozone tendencies in the free troposphere

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