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Proceedings Paper

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)
Author(s): Detlev Sprung; Peter Grossmann; Erik Sucher; Karin Weiss-Wrana; Karin Stein
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Paper 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 Cn2. 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 independent measurement systems have been operated in a flat pasture site in north-western Germany. In the 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. Cn2 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 Cn2. 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.

Paper Details

Date Published: 11 October 2011
PDF: 12 pages
Proc. SPIE 8178, Optics in Atmospheric Propagation and Adaptive Systems XIV, 817809 (11 October 2011); doi: 10.1117/12.897720
Show Author Affiliations
Detlev Sprung, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Peter Grossmann, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Erik Sucher, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Karin Weiss-Wrana, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)
Karin Stein, Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung (Germany)


Published in SPIE Proceedings Vol. 8178:
Optics in Atmospheric Propagation and Adaptive Systems XIV
Karin Stein; John D. Gonglewski, Editor(s)

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