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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-858
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
28 Oct 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Benzene and Toluene in the surface air of North Eurasia from TROICA-12 campaign along the Trans-Siberian railway
Andrey I. Skorokhod, Elena V. Berezina, Konstantin B. Moiseenko, Nikolai F. Elansky, and Igor B. Belikov A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, 119017, Russia
Abstract. Volatile organic compounds (VOCs) were measured by proton transfer reaction – mass spectrometry (PTR-MS) on a mobile laboratory in a transcontinental TROICA-12 (21.07.2008–04.08.2008) campaign along the Trans-Siberian railway from Moscow to Vladivostok. Surface concentrations of benzene (C6H6) and toluene (C7H8) along with non-methane hydrocarbons (NMHCs), CO, O3, SO2, NO, NO2 and meteorology are analyzed in this study to identify the main sources of benzene and toluene along the Trans-Siberian railway. The most measurements in the TROICA-12 campaign were conducted under low-wind/stagnant conditions in moderately (~ 78 % of measurements) to weakly polluted (~ 20 % of measurements) air directly affected by regional anthropogenic sources adjacent to the railroad. Only 2 % of measurements were identified as characteristic of highly polluted urban atmosphere. Maximum values of benzene and toluene during the campaign reached 36.5 ppb and 45.6 ppb, correspondingly, which is significantly less than their one-time maximum permissible concentrations (94 and 159 ppb for benzene and toluene, correspondingly). About 90 % of benzene and 65 % of toluene content is attributed to motor vehicle transport and 10 % and 20 %, correspondingly, provided by the other local and regional-scale sources. The highest average concentrations of benzene and toluene are measured in the industrial regions of the European Russia (up to 0.3 and 0.4 ppb for benzene and toluene, correspondingly) and south Siberia (up to 0.2 and 0.4 ppb for benzene and toluene, correspondingly). Total contribution of benzene and toluene to photochemical ozone production along the Trans-Siberian railway is about 16 % compared to the most abundant biogenic VOC – isoprene. This contribution, however, is found to be substantially higher (up to 60–70 %) in urbanized areas along the railroad suggesting important role of anthropogenic pollutant sources in regional ozone photochemistry and air quality.

Citation: Skorokhod, A. I., Berezina, E. V., Moiseenko, K. B., Elansky, N. F., and Belikov, I. B.: Benzene and Toluene in the surface air of North Eurasia from TROICA-12 campaign along the Trans-Siberian railway, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-858, in review, 2016.
Andrey I. Skorokhod et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'comments', Anonymous Referee #1, 24 Dec 2016 Printer-friendly Version 
AC1: 'Response to Referee's comments', Elena Berezina, 26 Jan 2017 Printer-friendly Version Supplement 
 
RC2: 'Referee comment', Anonymous Referee #2, 07 Feb 2017 Printer-friendly Version 
AC2: 'Response to the Referee#2', Elena Berezina, 13 Feb 2017 Printer-friendly Version Supplement 
Andrey I. Skorokhod et al.
Andrey I. Skorokhod et al.

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Short summary
Main highlights of this study are: 1. Spatial variations of benzene and toluene levels along the Trans-Siberian railway are revealed and the main anthropogenic sources are identified. 2. The contribution of vehicle transport and other local and regional-scale sources to benzene and toluene levels is estimated. 3. Total contribution of benzene and toluene to photochemical ozone production along the Trans-Siberian railway is calculated and compared to the most abundant biogenic VOC – isoprene.
Main highlights of this study are: 1. Spatial variations of benzene and toluene levels along...
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