Colloquium on 5 December 2013
The PBL: a new instrument for atmospheric turbulence profiles


Title: The PBL: a new instrument for atmospheric turbulence profiles
Speaker: Laure Catala
Date: Thursday, 5 December 2013
Time: 11:00 - 12:00
Venue: SAAO Auditorium


Early 2010 we set up and started operating a MASS-DIMM (multi aperture scintillation sensor – differential image motion monitor) at the Sutherland site. The instrument has produced a valuable statistical sample of data allowing to extract general trends and low altitude resolution profiles of the atmospheric turbulence in addition to provide all observers on the plateau with the current seeing conditions.

In addition to the continuous monitoring done with the MASS-DIMM instrument, we started a collaboration with the University of Nice (France) who developed a new instrument (PBL). The main goal of the PBL is to provide high altitude resolution profiles of both the turbulence strength and the outer scale. This will be the first instrument providing the outer scale profile which is a critical parameter for the upcoming ELTs. In this talk I will explain the importance of characterizing the outer-scale profile. Then I will present the general working principle of the PBL, the work done in order to obtain atmospheric profiles from it and the first results from observations done at Sutherland in August 2011.

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