A statistical study of the interrelationship between turbulence-related quantities in an elevated sheet-and-layer zone, and evidence for strong anisotropy
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A statistical study of the interrelationship between turbulence-related quantities in an elevated sheet-and-layer zone, and evidence for strong anisotropy

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  • Personal Author:
    Gossard, Earl
  • Corporate Authors:
    Wave Propagation Laboratory
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)
  • Description:
    Fast response turbulence data and mean gradient data were recorded on the 300 m tower of the Boulder Atmospheric Observatory, located near Erie, Colorado, USA. Data were recorded for 30 minutes within an elevated stable zone while the carriage was held stationary at 121 m elevation. Very sharp sheets and layers moved past the sensors during this period, but 3 intervals of relatively time stationary records were isolated for extensive statistical analyses. Following some background information, the chronology of events during the experimental period is described, and the instrumentation and methods for measuring the various structure parameters and the gradient Richardson Number are discussed. A multiple and partial correlation and regression analysis perature and velocity structure parameters and the mean_height gradients of temperature and velocity (C 2, C 2, d9/dz, |dv/dz|) is then carried out and the results are described.V It is found~that |dv/dz | is on],y weakly correlated with CT and d0/dz, but is well correlated with C • On the other hand d0/dz is highly correlated with CT2 and CW2, but negligibly correlated with |dv/dz|. This data base strongly suggests anisotropy of the perturbations, even at very small scales.

    It prompted a more extensive study of anisotropy within stable layers, in which the tower carriage was passed through a very stable inversion layer while measuring turbulence quantities with fast response sensors. This study verified the existence of strong anisotropy in both the horizontal plane and the vertical plane containing the local mean wind.

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  • Series:
    NOAA technical memorandum ERL WPL ; 133
  • Document Type:
    Technical Memorandum
  • License:
  • Rights Information:
    CC0 Public Domain
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    Library
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