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Volume 17, issue 8 | Copyright

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

Atmos. Chem. Phys., 17, 5515-5535, 2017
https://doi.org/10.5194/acp-17-5515-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 02 May 2017

Research article | 02 May 2017

Summertime observations of elevated levels of ultrafine particles in the high Arctic marine boundary layer

Julia Burkart1, Megan D. Willis1, Heiko Bozem2, Jennie L. Thomas3, Kathy Law3, Peter Hoor2, Amir A. Aliabadi4, Franziska Köllner5, Johannes Schneider5, Andreas Herber6, Jonathan P. D. Abbatt1, and W. Richard Leaitch7 Julia Burkart et al.
  • 1Department of Chemistry, University of Toronto, Toronto, Canada
  • 2Institute of Atmospheric Physics, Johannes Gutenberg-University, Mainz, Germany
  • 3LATMOS/IPSL, UPMC Univ. Paris 06 Sorbonne Universités, UVSQ, CNRS, Paris, France
  • 4Environmental Engineering Program, University of Guelph, Guelph, Canada
  • 5Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 6Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
  • 7Environment and Climate Change Canada, Toronto, Ontario, Canada

Abstract. Motivated by increasing levels of open ocean in the Arctic summer and the lack of prior altitude-resolved studies, extensive aerosol measurements were made during 11 flights of the NETCARE July 2014 airborne campaign from Resolute Bay, Nunavut. Flights included vertical profiles (60 to 3000m above ground level) over open ocean, fast ice, and boundary layer clouds and fogs. A general conclusion, from observations of particle numbers between 5 and 20nm in diameter (N5 − 20), is that ultrafine particle formation occurs readily in the Canadian high Arctic marine boundary layer, especially just above ocean and clouds, reaching values of a few thousand particles cm−3. By contrast, ultrafine particle concentrations are much lower in the free troposphere. Elevated levels of larger particles (for example, from 20 to 40nm in size, N20 − 40) are sometimes associated with high N5 − 20, especially over low clouds, suggestive of aerosol growth. The number densities of particles greater than 40nm in diameter (N >  40) are relatively depleted at the lowest altitudes, indicative of depositional processes that will lower the condensation sink and promote new particle formation. The number of cloud condensation nuclei (CCN; measured at 0.6% supersaturation) are positively correlated with the numbers of small particles (down to roughly 30nm), indicating that some fraction of these newly formed particles are capable of being involved in cloud activation. Given that the summertime marine Arctic is a biologically active region, it is important to better establish the links between emissions from the ocean and the formation and growth of ultrafine particles within this rapidly changing environment.

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Our aircraft study for the first time systematically investigates aerosol size distributions, including ultrafine particles (5–20 nm in diameter), in the Arctic summertime atmosphere. We find that ultrafine particles occur very frequently in the boundary layer and not aloft, suggesting a surface source of these particles. Understanding aerosol properties and sources is crucial to predict climate and especially important in the Arctic as this region responds extremely fast to climate change.
Our aircraft study for the first time systematically investigates aerosol size distributions,...
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