EPJ Web Conf.
Volume 237, 2020The 29th International Laser Radar Conference (ILRC 29)
|Number of page(s)||4|
|Published online||07 July 2020|
Is Near-Spherical Shape “the New Black” for Smoke ?
1 National Observatory of Athens, IAASARS, Athens, Greece
2 Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, Greece
3 ONERA, The French Aerospace Lab, Toulouse, France
4 Institute of Atmospheric Physics, German Aerospace Center (DLR), Oberpfaffenhofen, Germany
5 Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
* Email: firstname.lastname@example.org
Published online: 7 July 2020
We present smoke lidar measurements from the Canadian fires of 2017. The advected smoke layers over Europe are detected at both tropospheric and stratospheric heights, with the latter presenting non-typical values of the Particle Linear Depolarization Ratio (PLDR) with strong wavelength dependence from the UV to the Near-IR. Specifically, the PLDR values are of the order of 22, 18 and 4% at 355, 532 and 1064 nm respectively. In an attempt to interpret these results, we apply the hypothesis that smoke particles have near-spherical shapes. Scattering calculations with the T-matrix code support other findings in the literature (- ), showing that the near-spherical shape (or closely similar shapes as in ), is the only shape that has been shown to reproduce the observed PLDR and Lidar Ratio (LR) values of the stratospheric smoke particles at the three measurement wavelengths.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.