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Boreal environment research 19 (suppl. B): 1 © 2014 issn 1239-6095 (print) issn 1797-2469 (online) helsinki 30 september 2014

Preface to the special issue

This special issue closes the scientific work of the Finnish Centre of Excellence (FCoE) in “Physics, Chemistry, Biology and Meteorology of Atmospheric composition and Climate change”, conducted during the six-year period between 2008 and 2013. The issue starts with a paper that synthesizes our scientific progress made during the project, including the most important new findings, international collaboration and outlook for future research (Kulmala et al. 2014). The synthesis and outlook is fol- lowed by 24 research papers presenting the latest scientific results obtained during the project. These papers cover the following five subject areas: (1) formation and growth of atmospheric aerosol parti- cles, (2) ions and clusters, (3) aerosol–cloud interactions, (4) biosphere–atmosphere interactions, and (5) earth system behavior. The last paper of the special issue lies at the interface between science and society, demonstrating innovative activities of the FCoE to make scientific findings approachable to the general public.

Veli-Matti Kerminen and Markku Kulmala Helsinki, 18 June 2014

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LIITTYVÄT TIEDOSTOT

Experimental studies on nucleation and atmospheric aerosol particle formation down to the molecular level

The simulation results were compared with the corresponding results of the direct measurements of the APi-TOF mass spectrometer of charged ammonia-sulfuric acid clusters

Extending fundamental knowledge on aerosol formation bymeasuring sub–3 nm ions and particles

Firstly the relative contributions of sulfuric acid, ammonia and ions in nucleation processes was quantified experimentally, supporting that sulfuric acid alone cannot explain

Formation of low-volatility aerosol precursor molecules and clusters in the atmosphere

i) Develop a selective and sensitive method for neutral sulphuric acid and sulphuric acid containing cluster detection. ii) Detect and understand the first steps of neutral

From turbulence to cloud formation : modelling the aerosol-cloud interactions

The results in Paper IV provide evidence that accounting subgrid variability in cloud microphysical processes yields weaker anthropogenic change in LWP and, subsequently, in

On the formation and growth of sub-3 nm atmospheric particles and molecular clusters

i) To develop and evaluate theoretical methods to study the dynamics of sub-3 nm particles. ii) To obtain a comprehensive picture of the concentrations and dynamics of sub-3 nm

Probing gas-phase radical reactions and modeling the detection of aerosol precursors using computational and experimental methods

Understanding the gas-phase chemistry of secondary organic aerosol (SOA) formation is critical for accurate estimation of the effect of these aerosol on Earth’s radiative

Transport and retention of pollutants from different production systems

The papers covered the following general topics: (1) trans- port of nutrients, particles, and pesticides from agricultural catchment areas, (2) nitrogen and phosphorus

Physical and chemical characteristics of aerosol particles and cloud-droplet activation during the Second Pallas Cloud Experiment (Second PaCE)

Measured parameters included aerosol number size distribution, aerosol chemical composition, aerosol hygroscopic growth factor, cloud droplet number size distribution