References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-11-3093-2011

On the potential contribution of open lead particle emissions to the central Arctic aerosol concentration

Held

¹ ² Brooks

I. M.

³ Leck

² ⁴ Tjernström

² ⁴

University of Bayreuth, Bayreuth Center of Ecology and Environmental Research, 95440 Bayreuth, Germany

Stockholm University, Department of Meteorology, 10691 Stockholm, Sweden

University of Leeds, School of Earth and Environment, Leeds, LS2 9JT, UK

Bert Bolin Center for Climate Research, Stockholm University, 10691 Stockholm, Sweden

01 04 2011

11 7 3093 3105

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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We present direct eddy covariance measurements of aerosol number fluxes, dominated by sub-50 nm particles, at the edge of an ice floe drifting in the central Arctic Ocean. The measurements were made during the ice-breaker borne ASCOS (Arctic Summer Cloud Ocean Study) expedition in August 2008 between 2°–10° W longitude and 87°–87.5° N latitude. The median aerosol transfer velocities over different surface types (open water leads, ice ridges, snow and ice surfaces) ranged from 0.27 to 0.68 mm s<sup>−1</sup> during deposition-dominated episodes. Emission periods were observed more frequently over the open lead, while the snow behaved primarily as a deposition surface. Directly measured aerosol fluxes were compared with particle deposition parameterizations in order to estimate the emission flux from the observed net aerosol flux. Finally, the contribution of the open lead particle source to atmospheric variations in particle number concentration was evaluated and compared with the observed temporal evolution of particle number. The direct emission of aerosol particles from the open lead can explain only 5–10% of the observed particle number variation in the mixing layer close to the surface.

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