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Volume 17, issue 23 | Copyright

Special issue: Pan-Eurasian Experiment (PEEX)

Atmos. Chem. Phys., 17, 14365-14392, 2017
https://doi.org/10.5194/acp-17-14365-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 04 Dec 2017

Research article | 04 Dec 2017

Long-term measurements (2010–2014) of carbonaceous aerosol and carbon monoxide at the Zotino Tall Tower Observatory (ZOTTO) in central Siberia

Eugene F. Mikhailov1,2, Svetlana Mironova2, Gregory Mironov2, Sergey Vlasenko2, Alexey Panov3, Xuguang Chi4, David Walter1, Samara Carbone5, Paulo Artaxo5, Martin Heimann6, Jost Lavric6, Ulrich Pöschl1, and Meinrat O. Andreae1,7 Eugene F. Mikhailov et al.
  • 1Multiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany
  • 2Department of Atmospheric Physics, Saint-Petersburg University, St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., 199034, St. Petersburg, Russia
  • 3Sukachev Institute of Forest, Siberian Branch, Russian Academy of Sciences, 50 Akademgorodok, 660036, Krasnoyarsk, Russia
  • 4School of Atmospheric Sciences, Nanjing University, 210023, Jiangsu, China
  • 5Instituto de Física, Universidade de São Paulo (USP), Rua do Matão, Travessa R, 187, CEP 05508-900, São Paulo, SP, Brasil
  • 6Max-Planck-Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany
  • 7Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA

Abstract. We present long-term (5-year) measurements of particulate matter with an upper diameter limit of ∼10µm (PM10), elemental carbon (EC), organic carbon (OC), and water-soluble organic carbon (WSOC) in aerosol filter samples collected at the Zotino Tall Tower Observatory in the middle-taiga subzone (Siberia). The data are complemented with carbon monoxide (CO) measurements. Air mass back trajectory analysis and satellite image analysis were used to characterise potential source regions and the transport pathway of haze plumes. Polluted and background periods were selected using a non-parametric statistical approach and analysed separately. In addition, near-pristine air masses were selected based on their EC concentrations being below the detection limit of our thermal–optical instrument. Over the entire sampling campaign, 75 and 48% of air masses in winter and in summer, respectively, and 42% in spring and fall are classified as polluted. The observed background concentrations of CO and EC showed a sine-like behaviour with a period of 365±4 days, mostly due to different degrees of dilution and the removal of polluted air masses arriving at the Zotino Tall Tower Observatory (ZOTTO) from remote sources. Our analysis of the near-pristine conditions shows that the longest periods with clean air masses were observed in summer, with a frequency of 17%, while in wintertime only 1% can be classified as a clean. Against a background of low concentrations of CO, EC, and OC in the near-pristine summertime, it was possible to identify pollution plumes that most likely came from crude-oil production sites located in the oil-rich regions of Western Siberia. Overall, our analysis indicates that most of the time the Siberian region is impacted by atmospheric pollution arising from biomass burning and anthropogenic emissions. A relatively clean atmosphere can be observed mainly in summer, when polluted species are removed by precipitation and the aerosol burden returns to near-pristine conditions.

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