Evidence for marine biogenic influence on summertime Arctic aerosol


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Andreas.Herber [ at ] awi.de

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 toward the surface (mean 2.0). Both MSA-to-sulfate and OA-to-sulfate ratios were significantly correlated with FLEXPART-WRF-predicted air mass 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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ISI/Scopus peer-reviewed
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Published
Eprint ID
46147
DOI 10.1002/2017GL073359

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Willis, M. D. , Köllner, F. , Burkart, J. , Bozem, H. , Thomas, J. L. , Schneider, J. , Aliabadi, A. A. , Hoor, P. M. , Schulz, H. , Herber, A. B. , Leaitch, W. R. and Abbatt, J. P. D. (2017): Evidence for marine biogenic influence on summertime Arctic aerosol , Geophysical Research Letters, 44 (12), pp. 6460-6470 . doi: 10.1002/2017GL073359


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