The Stable Atmospheric Boundary Layer over an Antarctic ice Sheet |
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| Authors: | Dörthe Handorf Thomas Foken Christoph Kottmeier |
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| Affiliation: | (1) Alfred Wegener Institute for Marine and Polar Research, Research Department, Potsdam, Telegrafenberg A43, D-14473 Potsdam, Germany;(2) Dept. of Micrometeorology, University of Bayreuth, Universitätsstraße 30, D-95440 Bayreuth, Germany;(3) Institute of Meteorology and Climate Research, University of Karlsruhe, Kaiserstraße 12, D-76128 Karlsruhe, Germany |
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| Abstract: | Turbulence measurements up to 11-m height and longterm profile measurements up to 45-m height performed at the German Neumayer Station in Antarctica are used to investigate different components of turbulence closure schemes of the stable boundary layer. The results confirm the linear relationships for the universal functions of momentum and heat exchange in the stability range z/L < 0.8 ... 1, whereas the local scaling approach should be used above the surface layer. Furthermore, boundary-layer heights below 50 m are frequently observed at this coastal Antarctic site, mainly due to the influence of stability above the boundary layer. It is shown that the inclusion of this stability into parametrization relations is necessary to provide realistic equilibrium heights of the stable boundary layer. Two relations, based on different physical approaches, were successfully applied for the parametrization of the equilibrium height. |
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| Keywords: | Stable boundary layer Boundary-layer height Universal functions Similarity theory |
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