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Volume 16, issue 13
Atmos. Chem. Phys., 16, 8109-8123, 2016
https://doi.org/10.5194/acp-16-8109-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 8109-8123, 2016
https://doi.org/10.5194/acp-16-8109-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Jul 2016

Research article | 05 Jul 2016

Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements

Elina Giannakaki1,a, Pieter G. van Zyl2, Detlef Müller3, Dimitris Balis4, and Mika Komppula1 Elina Giannakaki et al.
  • 1Finnish Meteorological Institute, P.O. Box 1627, 70211, Kuopio, Finland
  • 2Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
  • 3School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, UK
  • 4Laboratory of Atmospheric Physics, Thessaloniki, Greece
  • aon leave from: Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, Athens, Greece

Abstract. Optical and microphysical properties of different aerosol types over South Africa measured with a multi-wavelength polarization Raman lidar are presented. This study could assist in bridging existing gaps relating to aerosol properties over South Africa, since limited long-term data of this type are available for this region. The observations were performed under the framework of the EUCAARI campaign in Elandsfontein. The multi-wavelength PollyXT Raman lidar system was used to determine vertical profiles of the aerosol optical properties, i.e. extinction and backscatter coefficients, Ångström exponents, lidar ratio and depolarization ratio. The mean microphysical aerosol properties, i.e. effective radius and single-scattering albedo, were retrieved with an advanced inversion algorithm. Clear differences were observed for the intensive optical properties of atmospheric layers of biomass burning and urban/industrial aerosols. Our results reveal a wide range of optical and microphysical parameters for biomass burning aerosols. This indicates probable mixing of biomass burning aerosols with desert dust particles, as well as the possible continuous influence of urban/industrial aerosol load in the region. The lidar ratio at 355nm, the lidar ratio at 532nm, the linear particle depolarization ratio at 355nm and the extinction-related Ångström exponent from 355 to 532nm were 52±7sr, 41±13sr, 0.9±0.4% and 2.3±0.5, respectively, for urban/industrial aerosols, while these values were 92±10sr, 75±14sr, 3.2±1.3% and 1.7±0.3, respectively, for biomass burning aerosol layers. Biomass burning particles are larger and slightly less absorbing compared to urban/industrial aerosols. The particle effective radius were found to be 0.10±0.03, 0.17±0.04 and 0.13±0.03µm for urban/industrial, biomass burning, and mixed aerosols, respectively, while the single-scattering albedo at 532nm was 0.87±0.06, 0.90±0.06, and 0.88±0.07 (at 532nm), respectively, for these three types of aerosols. Our results were within the same range of previously reported values.

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Optical and microphysical properties of different aerosol types over South Africa measured with a multi-wavelength polarization Raman lidar are presented. Aerosol characterization of elevated layers was performed. This study could assist in bridging existing gaps relating to aerosol properties over South Africa.
Optical and microphysical properties of different aerosol types over South Africa measured with...
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