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Shallow gravity flows over the Ekström ice shelf

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Abstract

Wind and temperature profiles measured near the Antarctic Georg von Neumayer Station in January and February 1983 are analysed with respect to situations of low cloud cover. In these situations, shallow inversions develop in the period of low sun elevation. The structure of these inversions in comparison with those in midlatitudes is explained by considering the heat fluxes near the ground, the influence of surface friction over different terrain roughness and for different Coriolis parameters.

One effect of stabilisation over the Ekström ice shelf is the development of shallow gravity-influenced flows. The flow dynamics are discussed by means of a scale analysis. The results show that gravity is of considerable influence; however, it will not dominate the other forces. Strictly speaking, the flow is not katabatic for the scale considered. The Froude numbers of the flow approach values similar to those of nocturnal inversions during cooling periods. Thus it seems that the modelling methods for midlatitude stable planetary boundary layers (PBLs) will be successful in explaining antarctic boundary layers as well.

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References

  • Augstein, E.: 1984, ‘The Observatories of the Georg von Neumayer Station (70 °37′ S, 08 °22′ W)’, Reports on Polar Research, Special Issue No. 5, 15 pp.

  • Ball, F. K.: 1956, ‘The Theory of Strong Katabatic Winds’, Austral. J. Physics 9, 373–386.

    Google Scholar 

  • Ball, F. K.: 1957, ‘The Katabatic Winds of Adelie Land and King George Land’, Tellus 9, 201–208.

    Google Scholar 

  • Berz, G.: 1969, ‘Untersuchungen zum Wärmehaushalt der Erdoberfläche und zum bodennahen atmosphärischen Transport’, Münchner Universitätsschriften, Wissenschaftliche Mitteilung Nr. 16, 144 pp.

  • Defant, A.: 1933, ‘Der Abfluβ schwerer Luftmassen auf geneigtem Boden, nebst einigen Bemerkungen zu der Theorie stationärer Luftströme’, Sitzungsbericht der Preuβischen Akademie der Wissenschaften, 624–635.

  • Fiedler, F. and Panofsky, H.: 1972, ‘The Geostrophic Drag Coefficient and the “Effective” Roughness Length’, Quart. J. Royal Meteorol. Soc. 98, 213–220.

    Google Scholar 

  • Geiger, R.: 1960, ‘Das Klima der bodennahen Luftschicht’, Vieweg und Sohn, Braunschweig, 641 pp.

    Google Scholar 

  • Hoeber, H.: 1968, ‘Wind-, Temperatur-, und Feuchteprofile in der wassernahen Schicht über dem äquatorialen Atlantik’, Meteor. Forschungsergebnisse 4, 1–26.

    Google Scholar 

  • Houghton, J. T.: 1984, ‘The Global Climate’, Cambridge University Press, 233 pp.

  • König, G.: 1985, Roughness Length of an Antarctic Ice Shelf, to appear in Polarforschung.

  • Kottmeier, Ch.: 1982, ‘Die Vertikalstruktur nächtlicher Grenzschichtstrahlströme’, Ber. des Instituts für Meteorologie und Klimatologie der Universität Hannover, 21, 129 pp.

  • Lettau, H., Riordan, A., and Kuhn, M.: 1977, ‘Air Temperature and Three-Dimensional Wind Profiles in the Lowest 32 Meters as a Funktion of Bulk Stability’, Antarctic Research Series 25, 77–79.

    Google Scholar 

  • Madigan, C. T.: 1929, Scientific Report Australian Antarctic Expedition 4, 1911–1914.

    Google Scholar 

  • Mahrt, L. and Schwerdtfeger, W. S.: 1970, ‘Ekman Spirals for Exponential Thermal Wind’, Boundary-Layer Meteorol. 1, 137–145.

    Google Scholar 

  • Mahrt, L.: 1982, ‘Momentum Balance of Gravity Flows’, Journal of the Atmospheric Science 39, 2701–2711.

    Google Scholar 

  • Mellor, M.: 1977, ‘Engineering Properties of Snow’, J. Glaciol. 19, No. 81, 15–66.

    Google Scholar 

  • Nieuwstadt, F. T. M.: 1984, ‘Some Aspects of the Turbulent Stable Boundary Layer’, Boundary-Layer Meteorol. 30, 31–55.

    Google Scholar 

  • Parish, Th. R.: 1982, ‘Surface Airflow over Eastern Antarctica’, Monthly Wea. Rev. 110, 84–110.

    Google Scholar 

  • Tetzlaff, G.: 1974, ‘Der Wärmehaushalt in der zentralen Sahara’, Ber. der Inst. Für Meteorologie und Klimatologie der Universität Hannover 13.

  • Wunsch, C.: 1984, ‘The Ocean Circulation in Climate’, in J. T. Houghton (ed.), Chapter 10 of The Global Climate, Cambridge University Press, Cambridge.

    Google Scholar 

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  1. Institut für Meteorologie und Klimatologie der Universität Hannover, Herrenhäuser Straβe 2, 3000, 21, Hannover, Bundesrepublik Deutschland

    C. Kottmeier

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  1. C. Kottmeier
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Kottmeier, C. Shallow gravity flows over the Ekström ice shelf. Boundary-Layer Meteorol 35, 1–20 (1986). https://doi.org/10.1007/BF00117299

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