Seasonal variations of trace gases, meteorological parameters, and formation of aerosols in boreal forests

The data from observations made in the Hyytiala background station over the period 1997-2003 were analyzed in order to investigate the possible links between physical, chemical and meteorological parameters for event and nonevent days during different seasons. The seasonal patterns of average trace gas (O 3 , H 2 O, NO = NO + NO 2 , SO,) concentrations, UV-A irradiation intensity, temperature, relative humidity and condensation sink were...