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Discussion papers | Copyright
https://doi.org/10.5194/acp-2017-672
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 01 Nov 2017

Research article | 01 Nov 2017

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This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.

Characterization of the cloud microphysical and optical properties and aerosol-cloud interaction in the Arctic from in situ ground-based measurements during the CLIMSLIP-NyA campaign, Svalbard

Gwennolé Guyot1, Frans Olofson1, Peter Tunved2, Christophe Gourbeyre1, Guy Fevbre1, Régis Dupuy1, Christophe Bernard1, Gérard Ancellet3, Kathy Law3, Boris Quennehen4, Alfons Schwarzenboeck1, Kostas Eleftheriadis5, and Olivier Jourdan1 Gwennolé Guyot et al.
  • 1Laboratoire de Météorologie Physique (LaMP), Université Blaise Pascal (UBP), OPGC, CNRS UMR 6016, Clermont-Ferrand, France
  • 2Department of Applied Environmental Science (ITM), Stockholm University, Stockholm, Sweden
  • 3Laboratoire Atmosphère, Milieux et Observations Spatiales (LATMOS), IPSL, UPMC, CNRS UMR 8190, Paris
  • 4Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE), Université Grenoble Alpes/CNRS, 38041 Grenoble, France
  • 5Environmental Radioactivity Laboratory, Institute of Nuclear and Radiological Science & Technology, Energy & Safety, Attiki, Greece

Abstract. This study will focus on cloud microphysical and optical characterization of three different types of episodes encountered during the ground based CLIMSLIP-NyA campaign performed in Ny-Alesund, Svalbard: the Mixed Phase Cloud (MPC), snow precipitation and Blowing Snow (BS) events. These in situ cloud measurements will be combined with aerosol measurements and air mass backtrajectory simulations to qualify and parameterize the arctic aerosol cloud interaction and to assess the influence of anthropogenic pollution transported into the Arctic.

The results show a cloud bimodal distribution with the droplet mode at 10µm and the crystal mode centered at 250µm, for the MPC cases. The precipitation cases presents a crystal distribution centered around 350µm with mostly of dendritic shape. The BS cases show a higher concentration but smaller crystals, centered between 150 and 200µm, with mainly irregular crystals.

A polluted case, where aerosol properties are influenced by anthropogenic emission from Europe and East Asia, was compared to a clean case with local aerosol sources. These anthropogenic emissions seem to cause higher Black Carbon, aerosol and droplet concentrations, a more pronounced accumulation mode, smaller droplet sizes and a higher activation fraction Fa. Moreover, the activation diameter decreases as the droplet diameter increases and Fa increases showing that smaller particles are activated and droplets grow when the aerosol number decreases. This is in agreement with the first (Twomey) and second (Albrecht) aerosol indirect effect. The quantification of the variations of droplet concentration and size leads to IE (Indirect Effect) and NE (Nucleation Efficiency) coefficients values around 0.2 and 0.43, respectively. These values are close to those found by other studies in the arctic region which confirms these parameterizations of arctic aerosol-cloud interaction in climate models.

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Gwennolé Guyot et al.
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Short summary
Cloud and aerosol properties are key parameters in the accelerated arctic warming. In this context, this study will focus on in situ cloud microphysical and optical characterization of arctic Mixed Phase Cloud combined with aerosol measurements and air mass backtrajectory simulations during the ground based CLIMSLIP-NyA campaign performed in Ny-Alesund, Svalbard. The goal is to parameterize the arctic aerosol-cloud interaction and assess the influence of anthropogenic pollution.
Cloud and aerosol properties are key parameters in the accelerated arctic warming. In this...
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