The paper presents the results of 13-year long investigations (1998-2010) of aerosol condensation activity in Tomsk. In the long-term behavior of the parameter of condensation activity, along with annual cycle and its second harmonics, the tendency is observed of slower oscillations ~6-7 years. Maximum values were observed in 1998-1999 and 2005-2007. Minimum annual mean values were realized in 2003 and 2008, i.e., the years when intrusions of subtropical air masses from arid regions of Kazakhstan and Middle Asia were more often.
aerosol, condensation activity, microstructure, long-term variability