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  • Organized large eddies  (2)
  • Springer  (2)
  • 1995-1999  (2)
  • 1975-1979
  • 1945-1949
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  • Springer  (2)
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  • 1995-1999  (2)
  • 1975-1979
  • 1945-1949
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  • 1
    Digitale Medien
    Digitale Medien
    Evidence of Organized Large Eddies by Ground-Based Doppler Lidar, Sonic Anemometer and Sodar (1998)
    Springer
    Boundary layer meteorology 88 (1998), S. 343-361 
    Details
    ISSN: 1573-1472
    Schlagwort(e): Heterodyne Doppler lidar ; Organized large eddies ; Planetary boundary laye ; Turbulence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract In an experiment investigating the planetary boundary layer (PBL) wind and temperature fields, and PBL inversion height recorded by various instruments, the results reveal the presence of organized large eddies (OLE) or rolls. The measurements by lidars, anemometers, soundings and sodar gave an overview of the characteristics of the rolls and sources of energy production that maintain them. The experimental results obtained on two consecutive days are compared to model outputs. The agreement is excellent, showing that thermal stratification and wind shear are important factors in the structure and dynamics of OLE. A heterodyne Doppler lidar (HDL) is shown to be a useful tool in the study of OLE.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1001167212584
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Evidence of a Mixed-Layer Dynamics Contribution to the Entrainment Process (1999)
    Springer
    Boundary layer meteorology 93 (1999), S. 47-73 
    Details
    ISSN: 1573-1472
    Schlagwort(e): Boundary-layer model ; Mixed-layer dynamics ; Organized large eddies ; Ekman flow ; Cold-air outbreak
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The internal thermal boundary layer developing over the Mediterranean during a cold-air outbreak associated with a Tramontane event has been studied by means of airborne lidar, in situ sensors, and a modelling approach that consisted of nesting the University of Washington (UW) planetary boundary-layer (PBL) model in an advective zero-order jump model. This approach bypasses some of the deficiencies associated with each model: the absence of the dynamics in the mixed layer for the zero-order jump model and the lack of an inversion at the PBL top for the UW PBL model. Particular attention is given to the parameterization of the entrainment flux at the PBL top. Values of the entrainment closure parameter derived with the model when matching PBL structure observations are much lower than those derived with standard zero-order jump models. They also are in good agreement with values measured in different meteorological situations by other studies. This improvement is a result of the introduction of turbulent kinetic energy production in the mixed layer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1002083425811
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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