A TURBULENT DATA-ANALYSIS IN THE ANTARCTIC BOUNDARY-LAYER

Data collected by the Institute of Atmospheric Physics of CNR (Italy) during the 1991 Italian Antarctic expedition are used for the developm ent of Earth-air-sea interaction studies. In this paper wind and tempe rature data obtained by a digitized ultrasonic anemometer-thermometer describe the temporal, statistical and spectral turbulence behaviour i n the surface atmospheric boundary layer at different wind conditions and in morphologically different sites. The vertical momentum and ther mal fluxes, evaluated through the direct method, are found to be stric tly dependent on the local stability condition recorded during the mea surements. The examination of the velocities and temperature probabili ty density functions confirms the Lumley and Panofsky hypothesis on th e influence of both velocity components on temperature fluctuations. A multichannel spectral analysis confirms the obtained results for the low-frequency range.