Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 18 2007 10.5194/acp-7-4793-2007 http://www.atmos-chem-phys.net/7/4793/2007/ http://www.atmos-chem-phys.net/7/4793/2007/acp-7-4793-2007.html http://www.atmos-chem-phys.net/7/4793/2007/acp-7-4793-2007.pdf 4793 4805 2007-09-21 Using a moving measurement platform for determining the chemical composition of atmospheric aerosols between Moscow and Vladivostok S. Kuokka K. Teinilä kimmo.teinila@fmi.fi K. Saarnio M. Aurela M. Sillanpää R. Hillamo V.-M. Kerminen K. Pyy E. Vartiainen M. Kulmala A. I. Skorokhod N. F. Elansky I. B. Belikov Finnish Meteorological Institute, Erik Palménin aukio 1, 00560, Helsinki, Finland University of Helsinki, Department of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland Obukhov Institute of Atmospheric Physics, Pyzhevsky 3, Moscow 119017, Russia The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements of aerosol physical and chemical properties were made from an observatory carriage connected to a passenger train. Black carbon (BC) concentrations in fine particles (PM_2.5, aerodynamic diameter <2.5 μm) were measured with an aethalometer using a five-minute time resolution. Concentrations of inorganic ions and some organic compounds (Cl^−, NO₃^−, SO₄^2−, Na⁺, NH₄⁺, K⁺, Ca²⁺, Mg²⁺, oxalate and methane sulphonate) were measured continuously by using an on-line system with a 15-min time resolution. In addition, particle volume size distributions were determined for particles in the diameter range 3–850 nm using a 10-min time resolution. The continuous measurements were completed with 24-h PM_2.5 filter samples stored in a refrigerator and analyzed later in a chemical laboratory. The analyses included the mass concentrations of PM_2.5, ions, monosaccharide anhydrides (levoglucosan, galactosan and mannosan) and trace elements (Al, As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sb, V and Zn). The mass concentrations of PM_2.5 varied in the range of 4.3–34.8 μg m^−3 with an average of 21.6 μg m^−3. Fine particle mass consisted mainly of BC (average 27.6%), SO₄^2− (13.0%), NH₄⁺ (4.1%) and NO₃^− (1.4%). One of the major constituents was obviously organic carbon which was not determined. The contribution of BC was high compared with other studies made in Europe and Asia. High concentrations of ions, BC and particle volume were observed between Moscow and roughly 4000 km east of it, as well as close to Vladivostok, primarily due to local anthropogenic sources. 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