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Sources and Radiative Absorption of Water-Soluble Brown Carbon in the High Arctic Atmosphere
Stockholm University, Faculty of Science, Department of Geological Sciences. McGill University, Canada.
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Number of Authors: 62019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 24, p. 14881-14891Article in journal (Refereed) Published
Abstract [en]

Brown carbon (BrC) is a source of light-absorbing aerosols. The Arctic is more sensitive to emissions of light-absorbing aerosols than lower latitudes. Knowledge of BrC in a historical period is beneficial to understand its role in a changing climate. Here, we present measurement of water-soluble BrC (WS-BrC) for the Arctic aerosols during late winter-late spring in 1991. Mass absorption coefficient (0.07 +/- 0.04 M/m) and efficiency (0.41 +/- 0.21 m(2)/g) at 365 nm of WS-BrC were lower than those in polluted urban and rural regions. WS-BrC was mainly from biomass burning/combustion (dark winter to mid-March) and marine sources connected with photochemical gas to particle conversion (after polar sunrise to June). Solar radiative absorption of WS-BrC relative to elemental carbon was 5% on average in February to April and surged to 34% after mid-May. This study helps in understanding the role of BrC in the Arctic climate.

Place, publisher, year, edition, pages
2019. Vol. 46, no 24, p. 14881-14891
Keywords [en]
organic aerosol, brown carbon, biomass burning, fossil fuel combustion, Canadian high Arctic
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-177798DOI: 10.1029/2019GL085318ISI: 000504376700001OAI: oai:DiVA.org:su-177798DiVA, id: diva2:1387726
Available from: 2020-01-22 Created: 2020-01-22 Last updated: 2020-03-16Bibliographically approved

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