Evidence of a reduction in cloud condensation nuclei activity of water-soluble aerosols caused by biogenic emissions in a cool-temperate forest.

ABSTRACT: Biogenic organic aerosols can affect cloud condensation nuclei (CCN) properties, and subsequently impact climate change. Large uncertainties exist in how the difference in the types of terrestrial biogenic sources and the abundance of organics relative to sulfate affect CCN properties. For the submicron water-soluble aerosols collected for two years in a cool-temperate forest in northern Japan, we show that the hygroscopicity parameter κ_CCN (0.44 ± 0.07) exhibited a distinct seasonal trend with a minimum in autumn (κ_CCN = 0.32-0.37); these κ_CCN values were generally larger than that of ambient particles, including water-insoluble fractions. The temporal variability of κ_CCN was controlled by the water-soluble organic matter (WSOM)-to-sulfate ratio

SUBMITTER: Muller A 

PROVIDER: S-EPMC5559486 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature