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Fluorescent water-soluble organic aerosols in the High Arctic atmosphere
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2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 9845Article in journal (Refereed) Published
Abstract [en]

Organic aerosols are ubiquitous in the earth's atmosphere. They have been extensively studied in urban, rural and marine environments. However, little is known about the fluorescence properties of water-soluble organic carbon (WSOC) or their transport to and distribution in the polar regions. Here, we present evidence that fluorescent WSOC is a substantial component of High Arctic aerosols. The ratios of fluorescence intensity of protein-like peak to humic-like peak generally increased from dark winter to early summer, indicating an enhanced contribution of protein-like organics from the ocean to Arctic aerosols after the polar sunrise. Such a seasonal pattern is in agreement with an increase of stable carbon isotope ratios of total carbon (delta C-13(TC)) from -26.8 parts per thousand to -22.5 parts per thousand. Our results suggest that Arctic aerosols are derived from a combination of the long-range transport of terrestrial organics and local sea-to-air emission of marine organics, with an estimated contribution from the latter of 8.7-77% (mean 45%).

Place, publisher, year, edition, pages
2015. Vol. 5, 9845
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Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-117446DOI: 10.1038/srep09845ISI: 000353597800001PubMedID: 25920042OAI: oai:DiVA.org:su-117446DiVA: diva2:813001
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AuthorCount:11;

Available from: 2015-05-21 Created: 2015-05-19 Last updated: 2017-12-04Bibliographically approved

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