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Stability and height dependant variations of the structure function parameters in the lower atmospheric boundary layer investigated from measurements of the long-term experiment VERTURM (vertical turbulence measurements

 
: Sprung, Detlev; Grossmann, Peter; Sucher, Erik; Weiss-Wrana, Karin; Stein, Karin

:

Stein, K. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optics in Atmospheric Propagation and Adaptive Systems XIV : 20.09.2011, Prague, Chech Republic
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 8178)
ISBN: 978-0-8194-8805-3
ISBN: 978-0-81948-805-3
Paper 817809
Conference "Optics in Atmospheric Propagation and Adaptive Systems" <14, 2011, Prague>
English
Conference Paper
Fraunhofer IOSB ()
optical turbulence; lower atmospheric boundary layer

Abstract
Operation and design of electro-optical systems are affected by atmospheric optical turbulence quantified by the refractive index parameter Cn². Regarding wave propagation in the visible and infrared (IR), Cn² is a function of height, dependant on temperature, pressure, and the structure temperature function parameter CT². The long-term experiment VerTurM (vertical turbulence measurements) was designed to characterize the vertical variations of optical turbulence up to 250 m in the lower atmospheric boundary layer for a moderate typical central European climate. Since May 2009 three atmospheric surface layer at a tall tower sonic anemometer measurements are performed on four discrete heights between 4 and 64 m providing information about atmospheric stability and turbulence. CT² is derived. From 30 to 250 m a SODAR-RASS system (Sound Detection and Ranging - Radio acoustic sounding system) yields every half an hour profiles of CT². Additional direct measurements of Cn² have been performed near the ground using a scintillometer. First results of the three measurement systems are presented. Vertical profiles and stability dependence are analysed in respect of Monin-Obukhov-similarity theory (MOST). Differences in the measurement systems and the expected height variations are discussed.

: http://publica.fraunhofer.de/documents/N-190179.html