Abstract
We report physical particle size distribution and chemical composition data over a Beech forest in Denmark during May and June of 2004 with a focus on four days characterized by high concentrations of ultra‐fine particles. Highest number concentrations of sub‐30 nm particles were observed when net radiation >300 W m−2 and ambient particle surface area <100 μm2 cm−3. The 10–30 nm particles show growth rates of 1.5–4.5 nm hr−1 and are comprised predominantly of ammonium, sulfate and associated water.
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