Abstract
In July 2005 the Oboukhov Institute of Atmospheric Physics (OIAP) and the Leipzig Institute for Meteorology (LIM) conducted a joint experiment at Zvenigorod (Russia) using the OIAP's acoustic pulse sounding method and the acoustic travel time tomography of the LIM group. These were deployed simultaneously with SODAR and temperature profiler measurements of wind speed and temperature profiles used for monitoring the state of the lower atmosphere. Internal gravity waves (IGWs) in the stably stratified atmosphere were detected by means of cross-coherence analysis of the acoustic travel times. The acoustic receivers were placed in groups of three at several locations distributed within the measurement field. Two methods were employed for detecting coherent structures: first in the vertical direction along refracting ray paths with turning points in the atmosphere between 50 m to 300 m and second the pulse propagation along almost horizontal ray paths that connect pairs of source and receivers. In this way both horizontal and vertical information of the state of the atmosphere was monitored continuously during the experiment; this allowed both the detection of wave-like structures and the spatial and temporal characteristics of the effective sound speed fluctuations. From these fluctuations the anisotropy of the IGW's is deduced. Two measurement days are analysed in this study which revealed several anisotropic frequency domains caused by wave-like structures.
Published Version
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