Abstract
Abstract Preliminary results from the 1985 IAGO (Interaction Atmosphere-Glace-Ocean) field programme in Adelie Land, Antarctica, allow for a detailed description of several katabatic events, especially of their vertical structure and time and space variations. Several Loewe's phenomena, where a sudden transition from shooting to tranquil flow takes place, have been observed. Two of them have been well documented and are shown here. For both cases, as observed at a downstream station close to the coast, the mean wind speed suddenly decreased from about 20 m s−1 to almost zero, while a large pressure increase was recorded (5.7 hPa on 3 December 1985 and 2.1 hPa on 18 December 1985). This paper aims at explaining such large surface-pressure changes, as more usual approaches cannot. For both cases it is found that the flow is stratified upwards with a surface well-mixed cold air layer, a very stable capping inversion layer, an overlying unstable layer thickening from upstream to downstream and a stable transi...
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