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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 2 | Copyright

Special issue: EARLINET, the European Aerosol Research Lidar Network

Atmos. Meas. Tech., 11, 1119-1141, 2018
https://doi.org/10.5194/amt-11-1119-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Feb 2018

Research article | 26 Feb 2018

Experimental techniques for the calibration of lidar depolarization channels in EARLINET

Livio Belegante1, Juan Antonio Bravo-Aranda2,3, Volker Freudenthaler4, Doina Nicolae1, Anca Nemuc1, Dragos Ene1, Lucas Alados-Arboledas2,3, Aldo Amodeo5, Gelsomina Pappalardo5, Giuseppe D'Amico5, Francesco Amato5, Ronny Engelmann6, Holger Baars6, Ulla Wandinger6, Alexandros Papayannis7, Panos Kokkalis7, and Sérgio N. Pereira8 Livio Belegante et al.
  • 1National Institute of Research and Development for Optoelectronics, 409 Atomistilor Str, Magurele, Romania
  • 2Andalusian Institute for Earth System Research, Granada, Spain
  • 3Department of Applied Physcis, University of Granada, Granada, Spain
  • 4Meteorological Institute, Ludwig-Maximilians-Universitat, Theresienstr. 37, 80333 Munich, Germany
  • 5Istituto di Metodologie per l'Analisi Ambientale CNR-IMAA, C.da S. Loja, Tito Scalo, Potenza 85050, Italy
  • 6Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
  • 7National Technical University of Athens (NTUA), Physics Department, Heroon Polytechniou 9, 15780 Zografou, Athens, Greece
  • 8Evora Geophysics Center, Rua Romao Ramalho 59, 7000, Evora, Portugal

Abstract. Particle depolarization ratio retrieved from lidar measurements are commonly used for aerosol-typing studies, microphysical inversion, or mass concentration retrievals. The particle depolarization ratio is one of the primary parameters that can differentiate several major aerosol components but only if the measurements are accurate enough. The accuracy related to the retrieval of particle depolarization ratios is the driving factor for assessing and improving the uncertainties of the depolarization products. This paper presents different depolarization calibration procedures used to improve the quality of the depolarization data. The results illustrate a significant improvement of the depolarization lidar products for all the selected lidar stations that have implemented depolarization calibration procedures. The calibrated volume and particle depolarization profiles at 532nm show values that fall within a range that is generally accepted in the literature.

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This paper presents different depolarization calibration procedures used to improve the quality of the depolarization data. The results illustrate a significant improvement of the depolarization lidar products for all the selected EARLINET lidar instruments. The calibrated volume and particle depolarization profiles at 532 nm show values that fall within a range that is accepted in the literature. The depolarization accuracy estimate at 532 nm is better than ±0.03 for all cases.
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