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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 7
Atmos. Chem. Phys., 18, 4885-4896, 2018
https://doi.org/10.5194/acp-18-4885-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 18, 4885-4896, 2018
https://doi.org/10.5194/acp-18-4885-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Apr 2018

Research article | 10 Apr 2018

Clear-air lidar dark band

Paolo Di Girolamo1, Andrea Scoccione2, Marco Cacciani2, Donato Summa1, Benedetto De Rosa1, and Jan H. Schween3 Paolo Di Girolamo et al.
  • 1Scuola di Ingegneria, Università degli Studi della Basilicata, Potenza, Italy
  • 2Dipartimento di Fisica, Università di Roma “La Sapienza”, Rome, Italy
  • 3Institut fuer Geophysik und Meteorologie, Universität zu Köln, Cologne, Germany

Abstract. This paper illustrates measurements carried out by the Raman lidar BASIL in the frame of the HD(CP)2 Observational Prototype Experiment (HOPE), revealing the presence of a clear-air dark band phenomenon (i.e. a minimum in lidar backscatter echoes) in the upper portion of the convective boundary layer. The phenomenon is clearly distinguishable in the lidar backscatter echoes at 532 and 1064nm, as well as in the particle depolarisation data. This phenomenon is attributed to the presence of lignite aerosol particles advected from the surrounding open pit mines in the vicinity of the measuring site. The paper provides evidence of the phenomenon and illustrates possible interpretations for its occurrence.

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The paper illustrates what we believe are the first measurements of a phenomenon taking place in upper portion of the convective boundary layer in clear-air conditions leading to the appearance of a persistent minimum in lidar backscatter echoes, with alternating intensifications and attenuations. The paper gives experimental evidence of the phenomenon and provides possible interpretations for its occurrence referring to both hygroscopic and scattering properties of sounded aerosol particles.
The paper illustrates what we believe are the first measurements of a phenomenon taking place in...
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