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- W2912997388 abstract "Abstract. Interaction of anthropogenic particles with radiation and clouds plays an important role on Arctic climate change. Mixing state of aerosols is a key parameter to influence aerosol-cloud and aerosol-radiation interaction. However, little is known on this parameter in the Arctic, preventing an accurate representation of this information in global models. Here we used transmission electron microscopy with energy-dispersive X-ray spectrometry (TEM/EDS), scanning TEM, scanning electron microscopy (SEM), nanoscale secondary ion mass spectrometry (NanoSIMS), and atomic forces microscopy (AFM) to determine the size and mixing properties of individual particles at 100 nm–10 μm, with a particular focus on sulfate and carbonaceous particles. We found that non-sea salt sulfate particles with size range at 100–2000 nm were commonly coated with organic matter (OM) in summer. 20 % of sulfate particles also had soot inclusions which only appeared in the organic coating. The OM coating is estimated to contribute to 63 % of the particle volume on average. Theoretical optical calculations from the Mie code suggest that absorption cross section of individual OM-coated particles significantly increased when assuming the OM coating as light-absorbing brown carbon (BrC). The microscopic observations suggest that OM modulates the mixing structure of fine Arctic sulfate particles, which may determine their hygroscopicity and optical properties." @default.
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- W2912997388 date "2019-02-04" @default.
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- W2912997388 title "Organic coating on sulfate and soot particles in summer Arctic atmosphere" @default.
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