Atmospheric Chemistry of Oxygenated Volatile Organic Compounds: Impacts on Air Quality and Climate

Mellouki, Abdelwahid; Wallington, Timothy J.; Chen, Jianmin

doi:10.1021/cr500549n

Cited by 442 publications

(333 citation statements)

References 223 publications

Supporting

Mentioning

328

Contrasting

Order By: Relevance

“…Five important VOCs were quantified for the first time in the ambient air of Delhi during WIFEX. These are isoprene (a very reactive emission from plants and combustion), acetonitrile (a biomass burning tracer) and the oxygenated VOCs -methanol, acetone, acetaldehydewhich are among the most water-soluble organics present in air, and are important for fog water chemistry 34,36 . Among the measured VOCs, the concentration of oxygenated VOCs (sum of methanol, acetaldehyde, acetone, methyl vinyl ketone and methyl ethyl ketone) was found to be highest followed by aromatic compounds (benzene, toluene, the sum of C8 and C9 aromatics such as dimethyl and trimethyl benzenes), isoprene and acetonitrile.…”

Section: +mentioning

confidence: 99%

Winter Fog Experiment Over the Indo-Gangetic Plains of India

et al. 2017

View full text Add to dashboard Cite

The objectives of the Winter Fog Experiment (WIFEX) over the Indo-Gangetic Plains of India are to develop better now-casting and forecasting of winter fog on various time-and spatial scales. Maximum fog occurrence over northwest India is about 48 days (visibility <1000 m) per year, and it occurs mostly during the December-February time-period. The physical and chemical characteristics of fog, meteorological factors responsible for its genesis, sustenance, intensity and dissipation are poorly understood. Improved understanding on the above aspects is required to develop reliable forecasting models and observational techniques for accurate prediction of the fog events. Extensive sets of comprehensive groundbased instrumentation were deployed at the Indira Gandhi International Airport, New Delhi. Major in situ sensors were deployed to measure surface micrometeorological conditions, radiation balance, turbulence, thermodynamical structure of the surface layer, fog droplet and aerosol microphysics, aerosol optical properties, and aerosol and fog water chemistry to describe the complete environmental conditions under which fog develops. In addition, Weather Forecasting Model coupled with chemistry is planned for fog prediction at a spatial resolution of 2 km. The present study provides an introductory overview of the winter fog field campaign with its unique instrumentation.

show abstract

Section: +mentioning

confidence: 99%

Winter Fog Experiment Over the Indo-Gangetic Plains of India

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Given the thousands of potential SOA precursors in air and the range of oxidation products they form, 36,375 there are a wide range of structures and volatilities of species that could contribute to SOA. 376,377 As seen in Fig.…”

Section: Soa Phasementioning

confidence: 99%

“…466 Thermal reactions involving uptake of carbonyl compounds such as glyoxal, followed by hydration and then reaction with sulfate ions are known to generate organosulfates. 375,467 Reactions of epoxides, for example from isoprene oxidation in the atmosphere, 468 also generate signicant amounts of organosulfates via ring-opening reactions with sulfuric acid/ sulfate. 469,470 Photochemical reactions in the condensed phase include direct absorption and photochemistry by organics, photosensitized reactions induced by interactions with excited triplet states (e.g.…”

mentioning

confidence: 99%

Introductory lecture: atmospheric chemistry in the Anthropocene

Finlayson-Pitts

2017

Faraday Discuss.

View full text Add to dashboard Cite

The term “Anthropocene” was coined by Professor Paul Crutzen in 2000 to describe an unprecedented era in which anthropogenic activities are impacting planet Earth on a global scale. Greatly increased emissions into the atmosphere, reflecting the advent of the Industrial Revolution, have caused significant changes in both the lower and upper atmosphere. Atmospheric reactions of the anthropogenic emissions and of those with biogenic compounds have significant impacts on human health, visibility, climate and weather. Two activities that have had particularly large impacts on the troposphere are fossil fuel combustion and agriculture, both associated with a burgeoning population. Emissions are also changing due to alterations in land use. This paper describes some of the tropospheric chemistry associated with the Anthropocene, with emphasis on areas having large uncertainties. These include heterogeneous chemistry such as those of oxides of nitrogen and the neonicotinoid pesticides, reactions at liquid interfaces, organic oxidations and particle formation, the role of sulfur compounds in the Anthropocene and biogenic–anthropogenic interactions. A clear and quantitative understanding of the connections between emissions, reactions, deposition and atmospheric composition is central to developing appropriate cost-effective strategies for minimizing the impacts of anthropogenic activities. The evolving nature of emissions in the Anthropocene places atmospheric chemistry at the fulcrum of determining human health and welfare in the future.

show abstract

“…Results of the RR-GC experiments have been summarised in Table 3. The determined rate coefficients are large values displaying high reactivity of OH with the cyclic ether 2-MTHF similarly to open-chain aliphatic ethers, see, e.g., [24][25][26] and references therein. It is to be noted, moreover that the k 1 value determined at ~3 mbar is less than half of that measured at ~1 bar suggesting a possible pressure dependence of the reaction.…”

Section: Determination Of K 1 From Rr-gc Experimentsmentioning

confidence: 99%

Direct and relative rate coefficients for the gas-phase reaction of OH radicals with 2-methyltetrahydrofuran at room temperature

Illés

Zügner

et al. 2016

Reac Kinet Mech Cat

View full text Add to dashboard Cite

2-methyltetrahydrofuran (2-MTHF) is a renewable green solvent, a platform molecule for organic syntheses and a potential automotive fuel or fuel additive that can be produced efficiently from lignocellulosic biomass. Its reaction with OH radicals is important concerning both of its atmospheric fate and combustion. Kinetics of the overall reaction OH + 2-MTHF → products (1) were studied at room temperature (T = 298 ± 1 K) using both direct and relative kinetic methods. The low pressure fast discharge flow (DF) experiments coupled with resonance fluorescence (RF) detection of OH have provided the direct rate coefficient of k 1 (298 K, 2.64 mbar He) = (1.21 ± 0.14 (±2σ)) × 10 -11 cm 3 molecule -1 s -1 . The relative-rate experiments (RR) with gas-chromatographic (GC) analysis were performed at higher pressure in synthetic air using the reaction OH + cyclohexane (c-C 6 H 12 ) → products (2) as reference. The determined rate coefficient ratio k 1 /k 2 = 3.80 ± 0.17 (±2σ) has been converted to k 1 (298 K, 1030 mbar air) = (2.65 ± 0.55 (±2σ)) × 10 -11 cm 3 molecule -1 s -1 . This k 1 value agrees reasonably well with the only other rate coefficient reported which was determined also at higher pressures. Comparison with the DF result indicates a possible pressure dependence of the reaction. Impact of 2-MTHF on the chemistry of the atmosphere has been briefly discussed.

show abstract

Atmospheric Chemistry of Oxygenated Volatile Organic Compounds: Impacts on Air Quality and Climate

Cited by 442 publications

References 223 publications

Winter Fog Experiment Over the Indo-Gangetic Plains of India

Winter Fog Experiment Over the Indo-Gangetic Plains of India

Introductory lecture: atmospheric chemistry in the Anthropocene

Direct and relative rate coefficients for the gas-phase reaction of OH radicals with 2-methyltetrahydrofuran at room temperature

Contact Info

Product

Resources

About