Articles | Volume 12, issue 9
Atmos. Chem. Phys., 12, 4143–4157, 2012
Atmos. Chem. Phys., 12, 4143–4157, 2012

Research article 10 May 2012

Research article | 10 May 2012

Lidar and radar measurements of the melting layer: observations of dark and bright band phenomena

P. Di Girolamo1, D. Summa1, M. Cacciani2, E. G. Norton3, G. Peters4, and Y. Dufournet5 P. Di Girolamo et al.
  • 1Dipartimento di Ingegneria e Fisica dell'Ambiente, Università degli Studi della Basilicata, Potenza, Italy
  • 2Dipartimento di Fisica, Università degli Studi di Roma "La Sapienza", Roma, Italy
  • 3School of Earth, Atmospheric & Environmental Sciences, University of Manchester, Manchester, UK
  • 4Meteorologisches Institut, Universität Hamburg, Hamburg, Germany
  • 5Delft University of Technology, Delft, The Netherlands

Abstract. Multi-wavelength lidar measurements in the melting layer revealing the presence of dark and bright bands have been performed by the University of BASILicata Raman lidar system (BASIL) during a stratiform rain event. Simultaneously radar measurements have been also performed from the same site by the University of Hamburg cloud radar MIRA 36 (35.5 GHz), the University of Hamburg dual-polarization micro rain radar (24.15 GHz) and the University of Manchester UHF wind profiler (1.29 GHz). Measurements from BASIL and the radars are illustrated and discussed in this paper for a specific case study on 23 July 2007 during the Convective and Orographically-induced Precipitation Study (COPS). Simulations of the lidar dark and bright band based on the application of concentric/eccentric sphere Lorentz-Mie codes and a melting layer model are also provided. Lidar and radar measurements and model results are also compared with measurements from a disdrometer on ground and a two-dimensional cloud (2DC) probe on-board the ATR42 SAFIRE. Measurements and model results are found to confirm and support the conceptual microphysical/scattering model elaborated by Sassen et al. (2005).

Final-revised paper