Elevated levels of glyoxal and methylglyoxal at a remote mountain site in southern China: Prompt in-situ formation combined with strong regional transport

Lv, Shaojun; Gong, Daocheng; Ding, Yaozhou; Lin, Youjing; Wang, Hao; Hang, Ding; Wu, Gengchen; He, Chao; Zhou, Lei; Liu, Shaw Chen; Ristovski, Zoran; Chen, Duohong; Shao, Min; Zhang, Yuanhang; Wang, Boguang

doi:10.1016/j.scitotenv.2019.04.020

Cited by 31 publications

(15 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More importantly, high chemical loss rates are expected to lead to low concentrations of BVOCs. The concentrations of aromatic VOCs are much greater than those of BVOCs, which is consistent with other studies in the subtropical forests in South China. ,,, The mean concentration of benzene is slightly higher than those in previous studies, while the mean concentrations of toluene, o -xylene, and styrene are lower than those reported by Wu et al and Tang et al The Guangdong province is one of the most developed regions in China. The high aromatic VOC concentrations in the forest suggest a high regional background of anthropogenic VOCs .…”

Section: Resultssupporting

confidence: 89%

“…High (MACR + MVK)-to-isoprene ratios were also observed in another subtropical-forest station in China in summer. These studies found high concentrations of glyoxal, methylglyoxal, and simulated OH radical that indicate strong atmospheric oxidative capacity. , …”

Section: Resultsmentioning

confidence: 90%

“…These studies found high concentrations of glyoxal, methylglyoxal, and simulated OH radical that indicate strong atmospheric oxidative capacity. 28,29 Figures 2 and Figure S6 in SI show the 72 h backward trajectories that are derived by the HYSPLIT model for the sampling periods. 33 The trajectories are divided into three categories on the basis of the transport distances and directions.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity

Liu

et al. 2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

Volatile organic compounds (VOCs) are important pollutants that affect air quality and atmosphere–ecosystem interactions. Atmospheric sampling onboard a multicopter unmanned aerial vehicle (UAV), serving as an economical and flexible measurement technique, collects valuable VOC data sets at intermediate spatial scales of hundreds of meters. In this study, we deployed a UAV-based VOC sampler in South China and conducted VOC samplings at two locations over the canopy of a subtropical forest. The collected VOC samples were analyzed offline by gas chromatography-mass spectrometry. Isoprene and α-pinene, two dominant biogenic VOCs, showed day-to-night variations that were consistent with their emission patterns. High concentrations of ozone and aromatic VOCs indicate a strong influence of anthropogenic pollution in this forest area. Meanwhile, high ratios of the concentrations of methacrolein and methyl vinyl ketone to isoprene were observed, which are consistent with the possibly fast atmospheric oxidation under the anthropogenic influence. Significant daytime concentration differences were observed between the two sampling locations for isoprene. The analysis by a gradient transport model suggests a large isoprene emission heterogeneity along the mountain slope at the scale of hundreds of meters for subtropical forests, which has not yet been well represented in most biosphere emission models. Strong eddy diffusion caused by the valley breeze may also contribute to the observed concentration differences.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity

Liu

et al. 2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

“…Higher O/C ratio of core-shell particles is also consistent with current studies reporting more oxidized organic species in cloud/fog residues (Brege et al, 2018;Chakraborty et al, 2016;Zhang et al, 2017b). With high levels of VOCs at the sampling site (Lv et al, 2019), prevalent formation of aqueous SOA through the uptake of VOCs in cloud droplets would be expected (Kim et al, 2019;Liu et al, 2018a). The contribution from photochemical processes may also be reflected by the association of the highest fraction (81%) of OM-containing particles with a higher concentration of O3 during cloud event #2 (Table S3).…”

Section: In-cloud Formation Of Ommentioning

confidence: 99%

Impact of in-cloud aqueous processes on the chemical compositions and morphology of individual atmospheric aerosols

Fu¹,

Lin²,

Zhang³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. The composition, morphology, and mixing structure of individual cloud residues (RES) and interstitial particles (INT) at a mountain-top site were investigated. Eight types of particles were identified, including sulfate-rich (S-rich), S-organic matter (OM), aged soot, aged mineral, aged fly ash, aged metal, fresh mixture, and aged mixture. A shift of dominant particle types from S-rich (29 %) and aged soot (27 %) in the INT to S-OM (24 %) and aged mixture (22 %) in the RES is observed. In particular, particles with organic shells are enriched in the RES (30 %) relative to the INT (12 %). Our results highlight the in-cloud formation of more oxidized organic shells on the activated particles. We also show that in-cloud processes may result in less compact soot, with the fractal dimensions (Df) of soot in the RES (1.82 ± 0.12) lower than those in the INT (2.11 ± 0.09). This research emphasizes the role of in-cloud processes on the chemistry and microphysical properties of individual particles. Given that organic coatings may determine the particle hygroscopicity, activation ability, and heterogeneous chemical reactivity, the increase of OM-shelled particles upon in-cloud processes should have considerable implications.

show abstract

“…50 Indeed, glyoxal and methylglyoxal are measurable in some environmental atmospheres and can be atmospheric contaminants derived from anthropogenic and biogenic sources. 49,51…”

Section: Introductionmentioning

confidence: 99%

Flavorings-Related Lung Disease: A Brief Review and New Mechanistic Data

et al. 2019

View full text Add to dashboard Cite

Flavorings-related lung disease is a potentially disabling and sometimes fatal lung disease of workers making or using flavorings. First identified almost 20 years ago in microwave popcorn workers exposed to butter-flavoring vapors, flavorings-related lung disease remains a concern today. In some cases, workers develop bronchiolitis obliterans, a severe form of fixed airways disease. Affected workers have been reported in microwave popcorn, flavorings, and coffee production workplaces. Volatile α-dicarbonyl compounds, particularly diacetyl (2,3-butanedione) and 2,3-pentanedione, are implicated in the etiology. Published studies on diacetyl and 2,3-pentanedione document their ability to cause airway epithelial necrosis, damage biological molecules, and perturb protein homeostasis. With chronic exposure in rats, they produce airway fibrosis resembling bronchiolitis obliterans. To add to this knowledge, we recently evaluated airway toxicity of the 3-carbon α-dicarbonyl compound, methylglyoxal. Methylglyoxal inhalation causes epithelial necrosis at even lower concentrations than diacetyl. In addition, we investigated airway toxicity of mixtures of diacetyl, acetoin, and acetic acid, common volatiles in butter flavoring. At ratios comparable to workplace scenarios, the mixtures or diacetyl alone, but not acetic acid or acetoin, cause airway epithelial necrosis. These new findings add to existing data to implicate α-dicarbonyl compounds in airway injury and flavorings-related lung disease.

show abstract

Elevated levels of glyoxal and methylglyoxal at a remote mountain site in southern China: Prompt in-situ formation combined with strong regional transport

Cited by 31 publications

References 46 publications

Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity

Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity

Impact of in-cloud aqueous processes on the chemical compositions and morphology of individual atmospheric aerosols

Flavorings-Related Lung Disease: A Brief Review and New Mechanistic Data

Contact Info

Product

Resources

About