Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska
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Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska

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  • Journal Title:
    Journal of Geophysical Research: Atmospheres
  • Personal Author:
  • NOAA Program & Office:
  • Description:
    Long-term data on organic aerosol concentration and optical properties are needed in the Arctic to improve characterization of radiative forcing by atmospheric aerosols. This study presents the seasonal trends (summer 2012 to summer 2013) of organic carbon (OC) and water-soluble organic carbon (WSOC) along with optical properties of light-absorbing OC from a yearlong sampling campaign in Utqiaġvik, AK. Ambient OC concentrations for the year range from 0.008 ± 0.002 μg m−3 to 0.95 ± 0.06 μg m−3 with peaks in late summer, early fall, and late winter. On average, WSOC accounted for 57 ± 11% of the total OC burden throughout the sampling campaign, which is consistent with previous WSOC values. In order to understand the potential radiative impacts of light-absorbing OC, the light absorption properties of WSOC were determined. Seasonal averaging revealed that the highest average mass absorption efficiency value of 1.54 ± 0.75 m2 g−1 was in the fall, with an annual range of 0.70 ± 0.44 to 1.54 ± 0.75 m2 g−1. To quantify the contributions of fossil and contemporary carbon sources to OC, radiocarbon abundance measurements were performed. For OC, fossil contributions were the greatest for select samples in the fall at 61.4 ± 9.8%, with contemporary contributions dominating OC in the spring and summer (68.9 ± 9.8% and 64.8 ± 9.8%, respectively). Back trajectories identified five major source regions to Utqiaġvik throughout the year, with a marine influence from the Arctic Ocean potentially present in all seasons. All these results point to impact from primary and secondary sources of OC in the Arctic.
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  • Source:
    JGR Atmospheres 122(17): 9319-9331
  • DOI:
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA14OAR4310150
  • Place as Subject:
    Alaska
  • Rights Information:
    Other
  • Compliance:
    Submitted
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