Hannele Hakola

TL;DR: Three separate size regimes below 2-nm diameter are identified that build up a physically, chemically, and dynamically consistent framework on atmospheric nucleation—more specifically, aerosol formation via neutral pathways.

TL;DR: In this paper, the authors investigated the connection between forest-atmosphere carbon exchange and aerosol dynamics in the continental boundary layer by means of multiannual data sets of particle formation and growth rates, of CO2 fluxes, and of monoterpene concentrations in a Scots pine forest in southern Finland.

TL;DR: In this paper, the formation yields of nine carbonyl products were reported from the gas-phase OH radical-initiated reactions (in the presence of NO x 2 ) and the O3 reactions with seven monoterpenes.

TL;DR: In this paper, the authors measured the volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) from trees growing in a natural forest environment at two locations in Finland, and found that the main emitted compounds were Δ3-carene (southern Finland) and α- and β-pinene (northern Finland), with approximate relative contributions of 60-70% and 60-85% of the total observed monoterpene emission rates, respectively.

TL;DR: In this paper, the atmospheric lifetime of α-pinene with respect to the OH reaction was estimated to be 50 times longer in December than in July, which can be explained by small, but existing, emissions from at least Picea abies and also by the much longer atmospheric life time of monoterpenes in winter than in summer.