Volatile hydrocarbons in and around Vienna, Austria

Lanzerstorfer, Christof; Puxbaum, Hans

doi:10.1007/bf00158231

Cited by 27 publications

(1 citation statement)

References 16 publications

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“…Gee et al [8] compared the concentrations of VOCs in some cities in Europe, America, and Asia and found that the VOC concentrations in Asia were the highest. The VOC concentrations in Vienna, Europe [9], Sydney, Oceania [10], Atlanta, North America [11], and Osaka, Asia [12] were 283.2, 279.9, 332.3, and 501.2 mg/m 3 , respectively. Domestically, research on VOCs can be traced back to the photochemical smog era in Lanzhou.…”

Section: Introductionmentioning

confidence: 99%

Vertical Features of Volatile Organic Compounds and Their Potential Photochemical Reactivities in Boundary Layer Revealed by In-Situ Observations and Satellite Retrieval

Yang,

Zhu,

Shi

et al. 2024

Remote Sensing

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Based on in-situ vertical observations of volatile organic compounds (VOCs) in the lower troposphere (0–1.0 km) in Nanjing, China, during the summer and autumn, we analyzed the VOCs vertical profiles, diurnal variation, and their impact factors in meteorology and photochemistry. The results showed that almost all the concentrations of VOC species decreased with height, similar to the profiles of primary air pollutants, as expected. However, we found the ratios of inactive species (e.g., acetylene) and secondary VOCs (e.g., ketones and aldehydes) in total VOCs (TVOCs) increased with height. Combined with satellite-retrieved data, we found the average HCHO tropospheric column concentrations were 2.0 times higher in the summer than in the autumn. While the average of tropospheric NO2 column concentrations was 3.0 times lower in the summer than in the autumn, the seasonal differences in the ratio of oxygenated VOCs (OVOCs) to NO2 (e.g., HCHO/NO2) shown in TROPOMI satellite-retrieved data were consistent with in-situ observations (e.g., acetone/NO2). On average, during autumn daytime, the mixing layer (ML), stable boundary layer (SBL), and residual layer (RL) had OH loss rates (LOH) of 6.9, 6.3, and 5.5 s−1, respectively. The LOH of alkenes was the largest in the ML, while the LOH of aromatics was the largest in the SBL and RL. At autumn night, the NO3 loss rates (LNO3) in the SBL and RL were 2.0 × 10−2 and 1.6 × 10−2 s−1, respectively, and the LNO3 of aromatics was the largest in the SBL and RL. In the daytime of summer, the LOH of VOCs was ~40% lower than that in autumn in all layers, while there was no significant difference in LNO3 at night between the two seasons. This study provides data support and a theoretical basis for VOC composite pollution control in the Nanjing region.

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Section: Introductionmentioning

confidence: 99%

Vertical Features of Volatile Organic Compounds and Their Potential Photochemical Reactivities in Boundary Layer Revealed by In-Situ Observations and Satellite Retrieval

Yang,

Zhu,

Shi

et al. 2024

Remote Sensing

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Organische Verbindungen und der Photosmog

Barnes

Becker

Wiesen

2007

Chemie in nserer Zeit

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In der Troposphäre werden infolge des stofflichen Eintrags aus natürlichen und anthropogenen Quellen mannigfaltige photochemische Reaktionen ausgelöst. Insbesondere wird die Bildung von Photooxidantien, verursacht durch die Emission reaktiver organischer Gase und Stickoxide als Vorkäufersubstanzen für Ozon, verändert. Einige grundlegende Reaktionsmechanismen für den Abbau verschiedener Gruppen organischer Verbindungen werden diskutiert. Der wichtigste Oxidationsmechanismus verläuft über OH‐Reaktionen in einer Radikalkette, die sich vor allem tagsüber in der belasteten Luft bei Sonneneinstrahlung ausbildet. Da über den Oxidationsmechanismus aromatischer Kohlenwasserstoffe die größten Wissenslücken bestehen, werden die dafür verantwortlichen bekannten und vorgeschlagenen Reaktionsmechanismen ausführlich erläutert. Schließlich wird das Problem der steigenden NO2‐Konzentrationen in urbaner Luft angesprochen.

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