Annual dynamics of aerosol organic components in the free atmosphere over South-Western Siberia

We study the annual behavior of the concentration of organic components of the atmospheric aerosol, sampled onboard the Tu-134 Optik airborne laboratory in the atmospheric layer of 500–8500 m. The concentration of the organic component in aerosol composition is found to be maximal during spring and minimal during fall. Compounds ranging from C8H18 to C35H72 are detected in the composition of aerosol particles. The range of hydrocarbons is the widest during the winter period (C12H26–C35H72) and during spring (C8H18–C31H64), and it is markedly narrower during summer (C18H38–C33H68) and during fall (C16H34–C31H64). One mode (n-alkane C20H42) predominates in aerosol composition throughout the year. A secondary maximum, corresponding to n-alkane C29H60, appears during the summer period.