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Piedehierro, Ana A; Welti, André; Buchholz, Angela; Korhonen, Kimmo; Pullinen, Iida; Summanen, Ilkka; Virtanen, Annele; Laaksonen, Ari
Atmospheric chemistry and physics, 07/2021, Letnik: 21, Številka: 14Journal Article
We investigate the effect of water content and oxidative age on ice nucleation using 100 nm monodisperse particles of boreal forest secondary organic aerosol (SOA) surrogates. Ice nucleation experiments are conducted in the temperature range between 210 and 240 K and from ice to water saturation using the Spectrometer for Ice Nuclei (SPIN). The effect of the particle water content on the ice nucleation process is tested by preconditioning α-pinene SOA at different humidities (40 %, 10 % and <1 % RH.sub.W). The influence of the particle oxidative age is tested by varying their O:C ratio (oxygen-to-carbon ratio, O:C â¼0.45, 0.8, 1.1). To assess the suitability of α-pinene as a model compound to study the ice nucleation properties of boreal forest SOA and to confirm the atmospheric relevance of our findings, we compare them to measurements of SOA using pine-needle oil or Scots pine tree emissions as precursors.
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