Nighttime Chemistry and Morning Isoprene Can Drive Urban Ozone Downwind of a Major Deciduous Forest

Millet, Dylan B.; Baasandorj, Munkhbayar; Hu, Li; Mitroo, Dhruv; Turner, Jay R.; Williams, Brent J.

doi:10.1021/acs.est.5b06367

Cited by 34 publications

(25 citation statements)

References 56 publications

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“…CC-BY 3.0 License. and box model simulations (Millet et al, 2016). This impact can be further complicated by uncertainty in emissions of BVOC and model resolutions.…”

Section: Influence On Reactive Nitrogen and Ozonementioning

confidence: 99%

“…This impact can be further complicated by uncertainty in emissions of BVOC and model resolutions. For example, a recent study by Millet et al (2016) shows that in a city downwind of an isoprene-rich forest, daytime O 3 can be largely modulated by the chemical removal of isoprene throughout the night. Such local scale event may only be captured by a very high resolution model with detailed characterization 5 of emission sources.…”

Section: Influence On Reactive Nitrogen and Ozonementioning

confidence: 99%

“…If BVOC react with NO 3 instead of OH, the O 3 production of the BVOC can be reduced relative to reactions through OH, although in some instances they may slightly increase 30 O 3 by reducing next-day NO x . For example, measurements in St. Louis (Millet et al, 2016), Atmos. Chem.…”

Section: Impacts Of No 3 -Bvoc Chemistry On Air Qualitymentioning

confidence: 99%

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Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms and organic aerosol

Ng¹,

Brown²,

Archibald³

et al. 2016

Preprint

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Abstract. Oxidation of biogenic volatile organic compounds (BVOC) by the nitrate radical (NO3) represents one of the important interactions between anthropogenic emissions related to combustion and natural emissions from the biosphere. This interaction has been recognized for more than three decades, during which time a large body of research has emerged from laboratory, field and modeling studies. NO3-BVOC reactions influence air quality, climate and visibility through regional and global budgets for reactive nitrogen (particularly organic nitrates), ozone and organic aerosol. Despite its long history of research and the significance of this topic in atmospheric chemistry, a number of important uncertainties remain. These include an incomplete understanding of the rates, mechanisms and organic aerosol yields for NO3-BVOC reactions, lack of constraints on the role of heterogeneous oxidative processes associated with the NO3 radical, the difficulty of characterizing the spatial distributions of BVOC and NO3 within the poorly mixed nocturnal atmosphere and the challenge of constructing appropriate boundary layer schemes and non-photochemical mechanisms for use in state-of-the-art chemical transport and chemistry-climate models. This review is the result of a workshop of the same title held at the Georgia Institute of Technology in June 2015. The first section summarizes the current literature on NO3-BVOC chemistry, with a particular focus on recent advances in instrumentation and models, and in organic nitrate and secondary organic aerosol (SOA) formation chemistry. Building on this current understanding, the second half of the review outlines impacts of NO3-BVOC chemistry on air quality and climate, and suggests critical research needs to better constrain this interaction to improve the predictive capabilities of atmospheric models.

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“…CC-BY 3.0 License. and box model simulations (Millet et al, 2016). This impact can be further complicated by uncertainty in emissions of BVOC and model resolutions.…”

Section: Influence On Reactive Nitrogen and Ozonementioning

confidence: 99%

Section: Influence On Reactive Nitrogen and Ozonementioning

confidence: 99%

See 1 more Smart Citation

Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms and organic aerosol

Ng¹,

Brown²,

Archibald³

et al. 2016

Preprint

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show abstract

“…In moderately polluted environments, e.g. forests surrounding urban areas, nitrate radicals (NO 3 ), which form mainly from the oxidation of NO 2 by O 3 , are the dominant oxidant of isoprene at night when photochemical production of OH has diminished (Ng et al, 2017). The nitrate radicals can be abundant at night and short-lived during the day due to their rapid photolysis in sunlight and its reaction with NO (Wayne et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Low-level summertime isoprene observed at a forested mountaintop site in southern China: implications for strong regional atmospheric oxidative capacity

et al. 2018

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Abstract. To investigate the atmospheric oxidative capacity (AOC) in forested high mountain areas adjacent to the photochemistry-active Pearl River Delta (PRD) region in southern China, one-month online observations of isoprene and its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) were conducted at a national background station in Nanling Mountains in summer 2016. The results showed that the observed daytime isoprene levels (377±46 pptv) were significantly lower in comparison with other forest sites within and outside China, although the sampling site was surrounded with subtropical evergreen broad-leaved trees which are strong isoprene emitters. Also, high daytime (MVK + MACR) ∕ isoprene ratios (1.9±0.5) were observed. Based on the observations, we hypothesized that the lower isoprene levels in the study forest might be attributable to a strong AOC in relation to the elevated regional complex air pollution. In further data analyses, high site-level concentrations of daytime OH (7.3±0.5×106 molecules cm−3) and nighttime NO3 radicals (6.0±0.5×108 molecules cm−3) were estimated by using a photochemical box model incorporating the master chemical mechanism (PBM-MCM), and high regional mixing ratios of OH (19.7±2.3×106 molecules cm−3) during 09:00–15:00 LT were also obtained by applying a parameterization method with measured aromatic hydrocarbons. And besides, high initial mixing ratios (1213±108 pptv) and short atmospheric reaction time (0.27 h) of isoprene during the day were derived by a sequential reaction approach. All these indicate that isoprene was rapidly and highly oxidized in this forest, which supports our hypothesis. The study suggests that the complex air pollution in the PRD may have significantly elevated the background AOC of the adjacent forests, and probably affects the regional air quality and ecological environment in the long term. The feedback of forest ecosystems to the increasing AOC in southern China warrants further studies.

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“…This region is downwind from the urban area of Sydney, where the largest emission source of NO x and VOC precursors is motor vehicles, and hence, causes elevated ozone downwind in the South West of Sydney. Various studies have shown that areas downwind from the upwind emission of precursors experience high ozone [32,33].…”

Section: Discussionmentioning

confidence: 99%

Source Contributions to Ozone Formation in the New South Wales Greater Metropolitan Region, Australia

Chang

Trieu

et al. 2018

Atmosphere

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Ozone and fine particles (PM2.5) are the two main air pollutants of concern in the New South Wales Greater Metropolitan Region (NSW GMR) due to their contribution to poor air quality days in the region. This paper focuses on source contributions to ambient ozone concentrations for different parts of the NSW GMR, based on source emissions across the greater Sydney region. The observation-based Integrated Empirical Rate model (IER) was applied to delineate the different regions within the GMR based on the photochemical smog profile of each region. Ozone source contribution was then modelled using the CCAM-CTM (Cubic Conformal Atmospheric model-Chemical Transport model) modelling system and the latest air emission inventory for the greater Sydney region. Source contributions to ozone varied between regions, and also varied depending on the air quality metric applied (e.g., average or maximum ozone). Biogenic volatile organic compound (VOC) emissions were found to contribute significantly to median and maximum ozone concentration in North West Sydney during summer. After commercial and domestic sources, power generation was found to be the next largest anthropogenic source of maximum ozone concentrations in North West Sydney. However, in South West Sydney, beside commercial and domestic sources, on-road vehicles were predicted to be the most significant contributor to maximum ozone levels, followed by biogenic sources and power stations. The results provide information that policy makers can use to devise various options to control ozone levels in different parts of the NSW Greater Metropolitan Region.

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Nighttime Chemistry and Morning Isoprene Can Drive Urban Ozone Downwind of a Major Deciduous Forest

Cited by 34 publications

References 56 publications

Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms and organic aerosol

Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms and organic aerosol

Low-level summertime isoprene observed at a forested mountaintop site in southern China: implications for strong regional atmospheric oxidative capacity

Source Contributions to Ozone Formation in the New South Wales Greater Metropolitan Region, Australia

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