Fig. 4.

Sources and sinks of highly oxygenated organic molecules (HOM). Modelled median diurnal trends of the sources and sinks of HOM at the Station for Measuring Ecosystem-Atmosphere Relations II (SMEAR II) between 15 and 24 May 2013. Panel a shows the sources and sinks inside the forest canopy (0–18 m above ground) while panel b shows the integrated sources and sinks between 0 and 2500 m above the ground. Note the different scales on the y-axes. The panels show the sources of HOM(g) from monoterpenes (MT) oxidized with O₃ and OH and the sinks due to dry deposition and condensation onto aerosol particles