Observation of Kelvin-Helmholtz and propagating buoyancy waves in the Antarctic with the help of sodar and microbarograph

Abstract

Internal gravity waves of different types are frequently observed in the stable atmoshperic boundary layer. The most common way to study the waves is analysis of pressure records. Remote sensing techniques also can be used to observe the waves and to estimate their parameters. We used synchronous sodar and microbarograph records obtained during austral summer at the Antarctic Finnish station Aboa (73.04° S, 13.40° W). Among six wave episodes of different types visible on sodar echograms there was only one in which corresponding pressure oscillations with nearly constant amplitude were present. For three episodes there were pressure oscillation with varying amplitude seemed to be associated with the waves visible on the echograms. For two cases corresponding pressure oscillations were absent.