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Preprints
https://doi.org/10.5194/acp-2020-453
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-453
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 25 May 2020

Submitted as: research article | 25 May 2020

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This preprint is currently under review for the journal ACP.

Biomass burning aerosols in the southern hemispheric midlatitudes as observed with a multiwavelength polarization Raman lidar

Athena Augusta Floutsi1, Holger Baars1, Martin Radenz1, Moritz Haarig1, Zhenping Yin1,2,3, Patric Seifert1, Cristofer Jimenez1, Ulla Wandinger1, Ronny Engelmann1, Boris Barja4, Felix Zamorano4, and Albert Ansmann1 Athena Augusta Floutsi et al.
  • 1Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 2School of Electronic Information, Wuhan University, Wuhan, China
  • 3Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China
  • 4Atmospheric Research Laboratory, University of Magallanes, Punta Arenas, Chile

Abstract. In this paper, we present long-term observations of the multiwavelength Raman lidar PollyXT conducted in the framework of the DACAPO-PESO campaign. Regardless the relatively clean atmosphere in the southern mid-latitude oceans region, we observed regularly events of long-range transported smoke, originating either from regional sources in South America or from Australia. Two case studies will be discussed. Both cases were identified as smoke events and they occurred on 5 February 2019 and 11 March 2019. 5 For the first case considered, the lofted smoke layer was located at an altitude between 1 and 4.2 km, and apart from the predominance of smoke particles, particle linear depolarization values indicated the presence of dust particles in the layer. Mean lidar ratio values at 355 and 532 nm were 49 ± 12 and 24 ± 18 sr respectively, while the mean particle linear depolarization was 7.6 ± 3.6 % at 532 nm. The advection of smoke and dust particles above Punta Arenas affected significantly the available CCN and INP in the lower troposphere, and triggered effectively ice crystal formation processes. Regarding the second case, the thin smoke layers were observed at altitudes between 5.5–7, 9 and 11 km. The particle linear depolarization ratio at 532 nm increased rapidly with height, starting from 2 % for the lowest two layers and increasing up to 9.5 % for the highest layer, indicating the possible presence of non-spherical coated soot aggregates. INP activation was effectively facilitated. The long-term analysis of the one year of observations showed that tropospheric smoke advection over Punta Arenas occurred 16 times (lasting from 1 to 17 hours), regularly distributed over the period and with high potential to influence cloud formation in the otherwise pristine environment of the region.

Athena Augusta Floutsi et al.

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Athena Augusta Floutsi et al.

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