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Free Content The summertime ABL structure over an antarctic oasis with a vertical Doppler sodar

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Abstract:

The one-component version of the multiple-frequency LATAN-3M sodar was operated during the summer 2006–2007 at the Russian Antarctic station Novolazarevskaya at Schirmacher oasis. We show the typical echograms for the prevailing conditions of forced turbulence, convective turbulence, strong katabatic flows and moist air advection with wave structures. The profiles of the vertical wind component and its variance reveal the vertical structure of local diurnal katabatic winds. We observed the core of a drainage flow at a height of 10–30 m. During the sea air mass advection, the wavy structures are clearly seen in the echograms at heights of 100–200 m a.g.l. The vertical wind component time series show that these waves are propagating rather than advected. The spectrum of the waves has a pronounced peak corresponding to the Brunt-Väisälä frequency in the layer 400–1000 m a.g.l. but not to that in the layer where the waves appear.

German
Die Einkomponentenversion des Multifrequenz-LATAN-3M-Sodar wurde im Sommer 2006–2007 auf der russischen antarktischen Station Novolazarevskaya an der Schirmacher Oase ausprobiert. Wir zeigen typische Echogramme unter den Bedingungen erzwungener Turbulenz, Konvektion, katabatischer Winde und feuchter Seeluft-Advektion. Die Profile der vertikalen Windkomponenten und ihre Varianz verraten die vertikale Struktur lokaler tageszeitlicher katabatischer Winde. Das Zentrum dieser Winde war in einer Höhe von 10–30 Metern zu beobachten. Füur die Seeluftmassenadvektion können die Wellenstrukturen in den Echogrammen klar auf einer Höohe von 100–200 Metern ü.N.N. gesehen werden. Die Zeitreihe vertikaler Windkomponenten zeigt, dass sich diese Wellen fortpflanzen. Das Spektrum der Wellen hat einen Spitzenwert in der Nähe der Brunt-Väisälä Frequenz für die Schicht 400–1000 ü.N.N. Diese Frequenz unterscheidet sich jedoch stark von der Brunt-Väisälä Frequenz für die Höhenschicht, wo die Wellen beobachtet wurden.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2009/0369

Publication date: April 1, 2009

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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