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Volume 16, issue 8
Atmos. Chem. Phys., 16, 5191-5202, 2016
https://doi.org/10.5194/acp-16-5191-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: NETCARE (Network on Aerosols and Climate: Addressing Key Uncertainties...

Atmos. Chem. Phys., 16, 5191-5202, 2016
https://doi.org/10.5194/acp-16-5191-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Apr 2016

Research article | 26 Apr 2016

Biogenic, anthropogenic and sea salt sulfate size-segregated aerosols in the Arctic summer

Roghayeh Ghahremaninezhad1, Ann-Lise Norman1, Jonathan P. D. Abbatt2, Maurice Levasseur3, and Jennie L. Thomas4 Roghayeh Ghahremaninezhad et al.
  • 1Department of Physics and Astronomy, University of Calgary, Calgary, Canada
  • 2Department of Chemistry, University of Toronto, Toronto, Canada
  • 3Department of Biology, Laval University, Québec, Canada
  • 4Sorbonne Universités, UPMC Univ. Paris 06, Université Versailles St-Quentin, CNRS/INSU, UMR8190, LATMOS-IPSL, Paris, France

Abstract. Size-segregated aerosol sulfate concentrations were measured on board the Canadian Coast Guard Ship (CCGS) Amundsen in the Arctic during July 2014. The objective of this study was to utilize the isotopic composition of sulfate to address the contribution of anthropogenic and biogenic sources of aerosols to the growth of the different aerosol size fractions in the Arctic atmosphere. Non-sea-salt sulfate is divided into biogenic and anthropogenic sulfate using stable isotope apportionment techniques. A considerable amount of the average sulfate concentration in the fine aerosols with a diameter  < 0.49µm was from biogenic sources (> 63%), which is higher than in previous Arctic studies measuring above the ocean during fall (< 15%) (Rempillo et al., 2011) and total aerosol sulfate at higher latitudes at Alert in summer (> 30%) (Norman et al., 1999). The anthropogenic sulfate concentration was less than that of biogenic sulfate, with potential sources being long-range transport and, more locally, the Amundsen's emissions. Despite attempts to minimize the influence of ship stack emissions, evidence from larger-sized particles demonstrates a contribution from local pollution.

A comparison of δ34S values for SO2 and fine aerosols was used to show that gas-to-particle conversion likely occurred during most sampling periods. δ34S values for SO2 and fine aerosols were similar, suggesting the same source for SO2 and aerosol sulfate, except for two samples with a relatively high anthropogenic fraction in particles  < 0.49µm in diameter (15–17 and 17–19 July). The high biogenic fraction of sulfate fine aerosol and similar isotope ratio values of these particles and SO2 emphasize the role of marine organisms (e.g., phytoplankton, algae, bacteria) in the formation of fine particles above the Arctic Ocean during the productive summer months.

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Aerosols in six size fractions (> 0.49–7.0 microns) were collected in the Arctic (July 2014). The isotopic composition of sulfate aerosols was measured to determine the role of biogenic and anthropogenic sources in the growth of aerosols. More than 63 % of the average sulfate concentration in the fine aerosols (> 0.49 microns) was from biogenic sources. For some samples, the S isotope ratio values for SO2 and fine aerosols were close together, suggesting the same source for SO2 and aerosol sulfur.
Aerosols in six size fractions (> 0.49–7.0 microns) were collected in the Arctic (July 2014)....
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