Lidar dark band
In the melting layer of precipitation a lidar often measures a dark band at about the same height as
the radar bright band. There are many good ideas on why the lidar backscatter could decrease at the onset
of melting at the top of the melting layer. I expect the most important to be the increased transparance of
the particle as cracks and holes are filled with liquid water (just let a graupel particle or snow flacke melt
on your hand).
The most complete description of the phemenon can be found in Chapter 8 of my thesis. Below you will find some of the earlier conference contributions as well.
ArticlesCloud measurements with radar
PhD thesis, 13 November 2000.
Chapter 8. Measurements of the melting layer using lidar and radar: the lidar dark band pdf (1.3 Mb) Radar and Lidar Observations of the Melting Process in the Bright Band
IGARSS 2000, Hawaii, USA.
Victor Venema, Herman Russchenberg, Arnoud Apituley, Andre van Lammeren, Susanne Crewell, and Leo Ligthart
The effect of the orientation of ice crystals in the melting layer and ice clouds on measurements using radar and lidar
The melting layer: The radar bright band is dark for lidar
Last update: 20 October 2003