Formation and gas/particle partitioning of monoterpenes photo‐oxidation products over forests

Kavouras, Ilias G.; Mihalopoulos, N.; Stephanou, Euripides G.

doi:10.1029/1998gl900251

Cited by 140 publications

(137 citation statements)

References 19 publications

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“…Schauer et al (51) placed an upper estimate of the total organic aerosol attributable to secondary sources in the South Coast Air Basin in California at 31%. Investigations by Kavouras et al (52,53) have shown that the reaction of O 3 with monoterpenes plays a significant role in secondary particle formation over forested areas. The common occurrence of O 3 in indoor air coupled with the common use of terpene-based products is likely to produce secondary aerosols in indoor air as well.…”

Section: Resultsmentioning

confidence: 99%

Ozone and limonene in indoor air: a source of submicron particle exposure.

Wainman

Zhang

Weschler

et al. 2000

Environ Health Perspect

225

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Little information currently exists regarding the occurrence of secondary organic aerosol formation in indoor air. Smog chamber studies have demonstrated that high aerosol yields result from the reaction of ozone with terpenes, both of which commonly occur in indoor air. However, smog chambers are typically static systems, whereas indoor environments are dynamic. We conducted a series of experiments to investigate the potential for secondary aerosol in indoor air as a result of the reaction of ozone with d-limonene, a compound commonly used in air fresheners. A dynamic chamber design was used in which a smaller chamber was nested inside a larger one, with air exchange occurring between the two. The inner chamber was used to represent a model indoor environment and was operated at an air exchange rate below 1 exchange/hr, while the outer chamber was operated at a high air exchange rate of approximately 45 exchanges/hr. Limonene was introduced into the inner chamber either by the evaporation of reagent-grade d-limonene or by inserting a lemon-scented, solid air freshener. A series of ozone injections were made into the inner chamber during the course of each experiment, and an optical particle counter was used to measure the particle concentration. Measurable particle formation and growth occurred almost exclusively in the 0.1-0.2 microm and 0.2-0.3 microm size fractions in all of the experiments. Particle formation in the 0.1-0.2 microm size range occurred as soon as ozone was introduced, but the formation of particles in the 0.2-0.3 microm size range did not occur until at least the second ozone injection occurred. The results of this study show a clear potential for significant particle concentrations to be produced in indoor environments as a result of secondary particle formation via the ozone-limonene reaction. Because people spend the majority of their time indoors, secondary particles formed in indoor environments may make a significant contribution to overall particle exposure. This study provides data for assessing the impact of outdoor ozone on indoor particles. This is important to determine the efficacy of the mass-based particulate matter standards in protecting public health because the indoor secondary particles can vary coincidently with the variations of outdoor fine particles in summer.

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Section: Resultsmentioning

confidence: 99%

Ozone and limonene in indoor air: a source of submicron particle exposure.

Wainman

Zhang

Weschler

et al. 2000

Environ Health Perspect

225

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“…Aspects of the formation process in different parts of the world are described in several articles. [33][34][35][36][37][38][39][40] The exact role of VOCs in the nucleation process is a subject of debate, although the fact that biogenic VOCs are much more reactive than anthropogenic VOCs 41 suggests that they play a role from the outset. Also, the acidity of seed particles appears to enhance the formation of SOA, [42][43][44] which may mean that current organic particle formation rates from natural emissions are greater than they would be under natural conditions because of the presence today of global anthropogenic inorganic acidic pollution.…”

Section: Emissions Of Pom From Forests and Othermentioning

confidence: 99%

Natural Background Visibility and Regional Haze Goals in the Southeastern United States

Tombach

Brewer²

2005

Journal of the Air & Waste Management Association

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The goal of the regional haze mitigation program in the United States is to attain "natural conditions" in national parks and wilderness areas by 2064. Results of research investigations on background concentrations of sea salt and biogenic organic matter, of episodic Saharan and Asian dust, and of carbon from natural fires were reviewed to provide a basis for making site-specific estimates of what the concentrations of atmospheric fine particulate matter components might be under natural conditions in the Southeastern United States. Based on this review, rough estimates were made of potential contributions of these aerosol components to natural background visibility. Natural organic particles were the dominant influence on the rate of visibility improvement required to reach natural conditions at an inland, mountainous location, and organic particles and sea salt were the dominant influences on the rate at a coastal location. African dust also had a large episodic effect, but the current regulatory approach is not designed to address episodic background variations. Insufficient data exist to quantify the

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“…As a consequence, laboratory investigations have started to explore the change of SOA properties during their lifetime. The ozonolysis of α-pinene ozonolysis is one of the most well-studied SOA systems (α-pinene-O 3 SOA), as α-pinene is a significant biogenic VOC in many regions, and its ozonolysis plays an important role in SOA formation Griffin et al, 1999;Yu et al, 1999;Kavouras et al, 1998Kavouras et al, , 1999. α-Pinene-O 3 SOA is also generally considered as a model for many biogenic VOCs containing an endocyclic double bond (Guenther et al, 1995).…”

Section: Denjean Et Al: Relating Hygroscopicity and Optical Propementioning

confidence: 99%

Relating hygroscopicity and optical properties to chemical composition and structure of secondary organic aerosol particles generated from the ozonolysis of α-pinene

et al. 2015

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Abstract. Secondary organic aerosol (SOA) were generated from the ozonolysis of α-pinene in the CESAM (French acronym for Experimental Multiphasic Atmospheric Simulation Chamber) simulation chamber. The SOA formation and aging were studied by following their optical, hygroscopic and chemical properties. The optical properties were investigated by determining the particle complex refractive index (CRI). The hygroscopicity was quantified by measuring the effect of relative humidity (RH) on the particle size (size growth factor, GF) and on the scattering coefficient (scattering growth factor, f (RH)). The oxygen to carbon atomic ratios (O : C) of the particle surface and bulk were used as a sensitive parameter to correlate the changes in hygroscopic and optical properties of the SOA composition during their formation and aging in CESAM.The real CRI at 525 nm wavelength decreased from 1.43-1.60 (±0.02) to 1.32-1.38 (±0.02) during the SOA formation. The decrease in the real CRI correlated to the O : C decrease from 0.68 (±0.20) to 0.55 (±0.16). In contrast, the GF remained roughly constant over the reaction time, with values of 1.02-1.07 (±0.02) at 90 % (±4.2 %) RH. Simultaneous measurements of O : C of the particle surface revealed that the SOA was not composed of a homogeneous mixture, but contained less oxidised species at the surface which may limit water absorption. In addition, an apparent change in both mobility diameter and scattering coefficient with increasing RH from 0 to 30 % was observed for SOA after 14 h of reaction. We postulate that this change could be due to a change in the viscosity of the SOA from a predominantly glassy state to a predominantly liquid state.

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Formation and gas/particle partitioning of monoterpenes photo‐oxidation products over forests

Cited by 140 publications

References 19 publications

Ozone and limonene in indoor air: a source of submicron particle exposure.

Ozone and limonene in indoor air: a source of submicron particle exposure.

Natural Background Visibility and Regional Haze Goals in the Southeastern United States

Relating hygroscopicity and optical properties to chemical composition and structure of secondary organic aerosol particles generated from the ozonolysis of α-pinene

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