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Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 142019 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 5, no 1, article id eaau8066Article in journal (Refereed) Published
Abstract [en]

Light-absorbing organic aerosols, known as brown carbon (BrC), counteract the overall cooling effect of aerosols on Earth's climate. The spatial and temporal dynamics of their light-absorbing properties are poorly constrained and unaccounted for in climate models, because of limited ambient observations. We combine carbon isotope forensics (delta C-13) with measurements of light absorption in a conceptual aging model to constrain the loss of light absorptivity (i.e., bleaching) of water-soluble BrC (WS-BrC) aerosols in one of the world's largest BrC emission regions-South Asia. On this regional scale, we find that atmospheric photochemical oxidation reduces the light absorption of WS-BrC by similar to 84% during transport over 6000 km in the Indo-Gangetic Plain, with an ambient first-order bleaching rate of 0.20 +/- 0.05 day(-1) during over-ocean transit across Bay of Bengal to an Indian Ocean receptor site. This study facilitates dynamic parameterization of WS-BrC absorption properties, thereby constraining BrC climate impact over South Asia.

Place, publisher, year, edition, pages
2019. Vol. 5, no 1, article id eaau8066
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-166620DOI: 10.1126/sciadv.aau8066ISI: 000457547900089PubMedID: 30729159OAI: oai:DiVA.org:su-166620DiVA, id: diva2:1297572
Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-03-20Bibliographically approved

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Dasari, SanjeevAndersson, AugustBikkina, SrinivasHolmstrand, HenryBudhavant, KrishnakantGustafsson, Örjan
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