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  • 1985-1989  (2)
Document type
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The øresund experiment — Wind and temperature structure over a land-water-land area (1987)
    Springer
    Boundary layer meteorology 41 (1987), S. 309-318 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A short description of the so-called øresund experiment is given. The project studies the atmospheric dispersion process and modifications in the wind field across the 20-km wide øresund strait between Denmark and Sweden. The meteorological observational network extended over a 80-km wide cross section through the øresund. The dispersion process was investigated by carrying out SF6 tracer experiments. Wind and temperature data obtained on June 5, 1984 during the øresund experiment are analysed. On that day the water surface was colder than the land area. The near-surface winds were found to accelerate over the water near the upwind coast, subsequently decelerated as the water fetch increased, and accelerated once again as the second land surface was encountered. The complicated behaviour of the lower level wind fields is explained by a combination of roughness length changes and the development of a shallow stable layer over the water that inhibits vertical momentum transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120447
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Turbulence and diffusion over inhomogeneous terrain (1987)
    Springer
    Boundary layer meteorology 41 (1987), S. 173-202 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper provides an overview of some aspects of atmospheric boundary-layer dispersion processes over homogeneous and complex terrain. Special emphasis is placed on a discussion of the boundarylayer scaling regimes over homogeneous terrain and the characteristics of the dispersion processes associated with each of these regimes. The paper points out that vertical concentration profiles usually deviate substantially from a Gaussian distribution. The mean flow and turbulence over a low hill is dealt with, and in the inner layer the turbulence levels are increased due to the mean flow speed-up. In the outer layer the turbulence is modified by the rapid distortion effect. In a middle layer the turbulence is reduced due to the effect of a hill-induced streamline curvature. The paper concludes that the flow perturbations introduced by large-scale hills and valleys invalidate the use of simple approximations for describing atmospheric dispersion processes, and that it is necessary to utilize the full set of equations of motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120438
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    Paper (German National Licenses)
    Fulltext
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