Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-959
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
21 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Clear-air lidar dark band
Paolo Di Girolamo1, Andrea Scoccione2, Marco Cacciani2, Donato Summa1, and Jan H. Schween3 1Scuola di Ingegneria, Università degli Studi della Basilicata, Italy
2Dipartimento di Fisica, Università di Roma "La Sapienza", Italy
3Institut fuer Geophysik und Meteorologie, Universität zu Köln, 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 1064 nm, as well as in the particle depolarization 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.

Citation: Di Girolamo, P., Scoccione, A., Cacciani, M., Summa, D., and Schween, J. H.: Clear-air lidar dark band, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-959, in review, 2017.
Paolo Di Girolamo et al.
Paolo Di Girolamo et al.
Paolo Di Girolamo et al.

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Short summary
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 the sounded aerosol particles.
The paper illustrates what we believe are the first measurements of a phenomenon taking place in...
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