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  • Cold air outbreak  (1)
  • Stable boundary layer  (1)
  • Springer  (2)
  • Elsevier
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  • Springer  (2)
  • Elsevier
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  • 1
    Electronic Resource
    Electronic Resource
    The Stable Atmospheric Boundary Layer over an Antarctic ice Sheet (1999)
    Springer
    Boundary layer meteorology 91 (1999), S. 165-189 
    Details
    ISSN: 1573-1472
    Keywords: Stable boundary layer ; Boundary-layer height ; Universal functions ; Similarity theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001889423449
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  • 2
    Electronic Resource
    Electronic Resource
    Roll Vortices and Boundary-Layer Development during a Cold Air Outbreak (1997)
    Springer
    Boundary layer meteorology 84 (1997), S. 45-65 
    Details
    ISSN: 1573-1472
    Keywords: Boundary-Layer development ; Vortex rolls ; Cold air outbreak
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The development of the boundary layer during a cold air outbreak in the FramStrait is documented by aircraft measurements. The convection was organisedinto roll vortices with aspect ratios increasing from 2.9 near the ice edgeto more than 6 at 100 km further downstream. This increase coincides with anincrease of the latent heat release in the cloud layer. The stability parameter-zi/L varies from about zero at the ice edge to 30 at a distance of 200 kmdownstream over open water where the satellite picture still shows cloudstreets. The increase is mainly due to the deepening of the boundary layer.The turbulent vertical sensible and latent heat fluxes near the surface amountto 400 W m-2 within a 300 km off-ice zone. 25% of the upward heat fluxin the subcloud layer is carried out by organised roll motions. Experimentswith a 2-dimensional non-hydrostatic model show a similar roll aspect ratio inthe first 50 km, but further downstream where condensational heating is moreimportant the modelled roll wavelengths are distinctly smaller than the observedones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000392931768
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    Paper (German National Licenses)
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