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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-271
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-271
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 07 Oct 2019

Submitted as: research article | 07 Oct 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

The potential of elastic/polarization lidars to retrieve extinction profiles

Elina Giannakaki1,2, Panos Kokkalis3,4, Eleni Marinou4,5, Nikolaos S. Bartsotas6, Vassilis Amiridis4, Albert Ansmann7, and Mika Komppula2 Elina Giannakaki et al.
  • 1Department of Environmental Physics and Meteorology, University of Athens, Athens, 15784, Greece
  • 2Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, Kuopio, 70211, Finland
  • 3Physics Department, Faculty of Science, Kuwait University, Kuwait
  • 4Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, 15236, Greece
  • 5Institute of Atmospheric Physics, German Aerospace Center (DLR), Oberpfaffenhofen, 82234, Germany
  • 6Atmospheric Modeling and Weather Forecasting Group, Department of Physics, National and Kapodistrian University of Athens, Greece
  • 7Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, 04318, Germany

Abstract. In this study we estimate the particle extinction profiles at Finokalia, Crete, using only the information provided by the elastic and polarization channels of a PollyXT lidar system. Most of the time Finokalia site is affected by only two aerosol types, i.e. marine and dust particles. These two aerosol types, having different optical properties, permit the separation of aerosol mixture. The proposed method uses the particle backscatter profiles at 532 nm and the vertically resolved particle linear depolarization ratio measurements at the same wavelength. The particle linear depolarization ratio and the lidar ratio values of pure aerosol types are taken from literature. The total extinction profile is then estimated and compared well with Raman retrievals. Any difference between the proposed methodology and Raman extinction profiles indicates that the non-dust component could be probably attributed to polluted marine or polluted continental aerosols. Comparison with sun-photometric aerosol optical depth observations is performed as well during daytime with reasonable differences between the two instruments. Differences in the total aerosol optical depth is attributed to the limited ability of the lidar to correctly represent the aerosol optical properties in the near range due to overlap problem.

Elina Giannakaki et al.
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Elina Giannakaki et al.
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Short summary
A new methodology, ElEx, is presented to provide the vertical profile of particle extinction profiles at Finokalia, Crete. Only the information provided by the elastic and polarization channels of a PollyXT lidar system is used. In the frame of this study the total extinction profile is compared well with Raman retrievals. ElEx can be used even during daytime and with low time resolution windows of 1 hour or less.
A new methodology, ElEx, is presented to provide the vertical profile of particle extinction...
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