Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity

Details Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity Oxidation of ambient biogenic secondary organic aerosol by hydroxyl radicals: Effects on cloud condensation nuclei activity

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3822805w&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 22, CiteID L22805

Physics

3

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Evolution Of The Atmosphere (1610, 8125), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Processes: Clouds And Aerosols

Scientific paper

Changes in the hygroscopicity of ambient biogenic secondary organic aerosols (SOA) due to controlled OH oxidation were investigated at a remote forested site at Whistler Mountain, British Columbia during July of 2010. Coupled photo-oxidation and cloud condensation nuclei (CCN) experiments were conducted on: i) ambient particles exposed to high levels of gas-phase OH, and ii) the water-soluble fraction of ambient particles oxidized by aqueous-phase OH. An Aerodyne Aerosol Mass Spectrometer (AMS) monitored the changes in the chemical composition and degree of oxidation (O:C ratio) of the organic component of ambient aerosol due to OH oxidation. The CCN activity of size-selected particles was measured to determine the hygroscopicity parameter ($\kappa$org,CCN) for particles of various degrees of oxygenation. In both cases, the CCN activity of the oxidized material was higher than that of the ambient particles. In general, $\kappa$org,CCN of the aerosol increases with its O:C ratio, in agreement with previous laboratory measurements.

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