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Preprints
https://doi.org/10.5194/acp-2020-22
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-22
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 Feb 2020

19 Feb 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Is the near-spherical shape the new black for smoke?

Anna Gialitaki1,2, Alexandra Tsekeri1, Vassilis Amiridis1, Romain Ceolato3, Lucas Paulien3, Anna Kampouri1,2, Antonis Gkikas1, Stavros Solomos1, Eleni Marinou4,1, Moritz Haarig5, Holger Baars5, Albert Ansmann5, Tatyana Lapyonok6, Anton Lopatin7, Oleg Dubovik6, Silke Groß4, Martin Wirth4, and Dimitris Balis2 Anna Gialitaki et al.
  • 1National Observatory of Athens/IAASARS, Athens, Greece
  • 2Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, Greece
  • 3ONERA, The French Aerospace Lab, Toulouse, France
  • 4Institute of Atmospheric Physics,German Aerospace Center (DLR), Oberpfaffenhofen, Germany
  • 5Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
  • 6Laboratoire d'Optique Atmosphérique, CNRS/Université Lille, Villeneuve d'Ascq, France
  • 7GRASP-SAS, Villeneuve d'Ascq, France

Abstract. We examine the capability of near-spherical-shaped particles to reproduce the non-typical Particle Linear Depolarization Ratio (PLDR) values measured over Europe for stratospheric smoke originating from Canadian wildfires. The smoke layers were detected both in the troposphere and the stratosphere, though in the latter case the particles presented PLDR values of almost 18 % at 532 nm as well as a strong spectral dependence from the UV to the Near-IR. The assumption that the smoke particles have a near-spherical shape allows for the reproduction of the observed PLDR and Lidar Ratio (LR), whereas this was not possible when using more complicated shapes. The results presented here are supported by recent findings in the literature, showing that up to now the near-spherical shape (or closely similar shapes) is the only morphology found capable of reproducing the observed intensive optical properties of stratospheric smoke, as well as their spectral dependence.

Anna Gialitaki et al.

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Anna Gialitaki et al.

Anna Gialitaki et al.

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Short summary
Smoke particles injected into the stratosphere are find to significantly depolarize the incident light while this effect is also accompanied by a strong spectral dependence. Here we utilize scattering simulations to show that this behavior can be attributed to the near-spherical shape of stratospheric smoke which can produce both the non-typical values and wavelength dependence of smoke depolarization. This was not feasible when assuming more complicated morphologies for the smoke particles.
Smoke particles injected into the stratosphere are find to significantly depolarize the incident...
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