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Strong anthropogenic control of secondary organic aerosol formation from isoprene in Beijing

Bryant, Daniel J ; Dixon, William J ; Hopkins, James R ; Dunmore, Rachel E ; Pereira, Kelly L ; Shaw, Marvin ; Squires, Freya A ; Bannan, Thomas J ; Mehra, Archit ; Worrall, Stephen D ; Bacak, Asan ; Coe, Hugh ; Percival, Carl J ; Whalley, Lisa K ; Heard, Dwayne E ; Slater, Eloise J ; Ouyang, Bin ; Cui, Tianqu ; Surratt, Jason D ; Liu, Di ; Shi, Zongbo ; Harrison, Roy ; Sun, Yele ; Xu, Weiqi ; Lewis, Alastair C ; Lee, James D ; Rickard, Andrew R ; Hamilton, Jacqueline F

Atmospheric chemistry and physics, 2020-06, Vol.20 (12), p.7531-7552 [Periódico revisado por pares]

Katlenburg-Lindau: Copernicus GmbH

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Título:
Strong anthropogenic control of secondary organic aerosol formation from isoprene in Beijing
Autor: Bryant, Daniel J ; Dixon, William J ; Hopkins, James R ; Dunmore, Rachel E ; Pereira, Kelly L ; Shaw, Marvin ; Squires, Freya A ; Bannan, Thomas J ; Mehra, Archit ; Worrall, Stephen D ; Bacak, Asan ; Coe, Hugh ; Percival, Carl J ; Whalley, Lisa K ; Heard, Dwayne E ; Slater, Eloise J ; Ouyang, Bin ; Cui, Tianqu ; Surratt, Jason D ; Liu, Di ; Shi, Zongbo ; Harrison, Roy ; Sun, Yele ; Xu, Weiqi ; Lewis, Alastair C ; Lee, James D ; Rickard, Andrew R ; Hamilton, Jacqueline F
Assuntos: Aerosol formation ; Aerosols ; Air pollution ; Air pollution control ; Air quality management ; Anthropogenic factors ; Chromatography ; Data analysis ; Data processing ; Elution ; Emissions ; High performance liquid chromatography ; HPLC ; Human influences ; Isoprene ; Isoprene emissions ; Liquid chromatography ; Mass spectrometry ; Mass spectroscopy ; Nitrogen compounds ; Nitrogen oxides ; Organic carbon ; Oxidation ; Oxides ; Ozone ; Particulate matter ; Photochemistry ; Pollutants ; Polluted environments ; Rainforests ; Scientific imaging ; Secondary aerosols ; Spectroscopy ; Sulfates ; Tracers ; Tropical climate ; Tropical forests ; Uptake ; Urban areas ; VOCs ; Volatile organic compounds
É parte de: Atmospheric chemistry and physics, 2020-06, Vol.20 (12), p.7531-7552
Descrição: Isoprene-derived secondary organic aerosol (iSOA) is a significant contributor to organic carbon (OC) in some forested regions, such as tropical rainforests and the Southeastern US. However, its contribution to organic aerosol in urban areas that have high levels of anthropogenic pollutants is poorly understood. In this study, we examined the formation of anthropogenically influenced iSOA during summer in Beijing, China. Local isoprene emissions and high levels of anthropogenic pollutants, in particular NOx and particulate SO42-, led to the formation of iSOA under both high- and low-NO oxidation conditions, with significant heterogeneous transformations of isoprene-derived oxidation products to particulate organosulfates (OSs) and nitrooxy-organosulfates (NOSs). Ultra-high-performance liquid chromatography coupled to high-resolution mass spectrometry was combined with a rapid automated data processing technique to quantify 31 proposed iSOA tracers in offline PM2.5 filter extracts. The co-elution of the inorganic ions in the extracts caused matrix effects that impacted two authentic standards differently. The average concentration of iSOA OSs and NOSs was 82.5 ng m−3, which was around 3 times higher than the observed concentrations of their oxygenated precursors (2-methyltetrols and 2-methylglyceric acid). OS formation was dependant on both photochemistry and the sulfate available for reactive uptake, as shown by a strong correlation with the product of ozone (O3) and particulate sulfate (SO42-). A greater proportion of high-NO OS products were observed in Beijing compared with previous studies in less polluted environments. The iSOA-derived OSs and NOSs represented 0.62 % of the oxidized organic aerosol measured by aerosol mass spectrometry on average, but this increased to ∼3 % on certain days. These results indicate for the first time that iSOA formation in urban Beijing is strongly controlled by anthropogenic emissions and results in extensive conversion to OS products from heterogenous reactions.
Editor: Katlenburg-Lindau: Copernicus GmbH
Idioma: Inglês

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Strong anthropogenic control of secondary organic aerosol formation from isoprene in Beijing

Katlenburg-Lindau: Copernicus GmbH

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