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https://doi.org/10.5194/acp-2020-473
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-473
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Jul 2020

07 Jul 2020

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This preprint is currently under review for the journal ACP.

The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds – Theoretical framework

Cristofer Jimenez1, Albert Ansmann1, Ronny Engelmann1, David Donovan2, Aleksey Malinka3, Jörg Schmidt4, Patric Seifert1, and Ulla Wandinger1 Cristofer Jimenez et al.
  • 1Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 2Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
  • 3National Academy of Sciences of Belarus, Minsk, Belarus
  • 4Institute of Meteorology, University of Leipzig, Leipzig, Germany

Abstract. In a series of two articles, a novel, robust, and practicable lidar approach is presented that allows us to derive microphysical properties of liquid-water clouds (cloud extinction coefficient, droplet effective radius, liquid-water content, cloud droplet number concentration) at a height of 50–100 m above cloud base. The temporal resolution of the observations is on the order of 30–120 sec. Together with the aerosol information (aerosol extinction coefficients, cloud condensation nucleus concentration) below the cloud layer, obtained with the same lidar, in-depth aerosol-cloud interaction studies can be performed. The theoretical background and the methodology of the new cloud lidar technique is outlined in this article (part 1), measurement applications are presented in an companion publication (part 2). The novel cloud retrieval technique is based on lidar observations of the volume linear depolarization ratio at two different receiver field-of-views (FOVs). Extensive simulations of lidar returns in the multiple scattering regime were conducted to investigate the capabilities of a dual-FOV polarization lidar to measure cloud properties and to quantify the information content in the measured depolarization features regarding the basic retrieval parameters (cloud extinction coefficient, droplet effective radius). Key simulation results and the developed overall data analysis scheme to obtain the aerosol and cloud products are presented.

Cristofer Jimenez et al.

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Cristofer Jimenez et al.

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Short summary
A novel lidar method to study cloud microphysical properties (of liquid water clouds) and to study aerosol-cloud interaction (ACI) is developed and presented in this paper. In this part1, the theoretical framework including an error analysis is given together with an overview of the aerosol information that the same lidar system can obtain, The ACI concept based on aerosol and cloud information is also explained. Applications of the proposed approach to lidar measurements are presented in part2.
A novel lidar method to study cloud microphysical properties (of liquid water clouds) and to...
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