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Journal Articles Geophysical Research Letters Year : 2017

Evidence for marine biogenic influence on summertime Arctic aerosol

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Abstract

We present vertically-resolved observations of aerosol composition during pristine summertime Arctic background conditions. The methansulfonic acid (MSA)-to-sulfate ratio peaked near the surface (mean 0.10), indicating a contribution from ocean-derived biogenic sulfur. Similarly, the organic aerosol (OA)-to-sulfate ratio increased towards the surface (mean 2.0). Both MSA-to-sulfate and OA-to-sulfate ratios were significantly correlated with FLEXPART-WRF-predicted airmass residence time over open water, indicating marine influenced OA. External mixing of sea salt aerosol from a larger number fraction of organic, sulfate and amine-containing particles, together with low wind speeds (median 4.7 m s−1), suggests a role for secondary organic aerosol formation. Cloud condensation nuclei concentrations were nearly constant (∼120 cm−3) when the OA fraction was <60% and increased to 350 cm−3 when the organic fraction was larger and residence times over open water were longer. Our observations illustrate the importance of marine-influenced OA under Arctic background conditions, which are likely to change as the Arctic transitions to larger areas of open water.
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Dates and versions

insu-01539519 , version 1 (17-07-2020)

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Megan D. Willis, Franziska Köllner, Julia Burkart, Johannes Bozem, Jennie L. Thomas, et al.. Evidence for marine biogenic influence on summertime Arctic aerosol. Geophysical Research Letters, 2017, 44 (12), pp.6460-6470. ⟨10.1002/2017gl073359⟩. ⟨insu-01539519⟩
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