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  • A conditional analysis method applied to globally intermittent turbulence

    Creator:
    Klipp, Cheryl L.
    Abstract:
    Globally intermittent turbulence is characterized by sudden switching from significant turbulence to weak turbulence and back on time scales ranging from seconds to tens of minutes as opposed to microscale intermittency, which is due to organization of small scale gradients by individual eddies on scales as small as the Kolmogorov...
    Resource Type:
    Dissertation
    Full Text:
    , 171-203. Howell, J. F. and L. Mahrt: 1997, 'Multiresolution Flux Decomposition', Boundary Layer

  • Sudden changes in local mean values demarcate geophysical regimes

    Creator:
    Howell, James F., 1965-
    Abstract:
    Sudden changes occur where the mean values associated with two adjacent non-overlapping windows of data are anomalously different, and the transition between the window means occurs over a scale that is small relative to the scale of the windows. Positions of sudden changes can be economically retrieved. The sudden change...
    Resource Type:
    Dissertation
    Full Text:
    . Wea. Rev., 123, 2913-2933. Mahrt, L. and J. F. Howell, 1994: The influence of coherent structures and

  • The influence of small scale variability on scaling relationships describing atmospheric turbulence

    Creator:
    Howell, James Frederick
    Abstract:
    The statistics describing variations of turbulent motions within the so called inertial range of length scales depend on the scale over which the motions are varying and the "average" rate at which the turbulent kinetic energy is being dissipated on the molecular scale. This hypothesis stemmed from the similarity arguments...
    Resource Type:
    Masters Thesis
    Full Text:
    - 1)1 N I2irr(i - 1)1 N x cos2 L N j & N x sin2 [ N j (7) i=1 i=1 The factor of N is needed to

  • Observational studies of stable nocturnal boundary layers: intermittent turbulence, sensible heat budgets and observational errors

    Creator:
    Nakamura, Reina
    Abstract:
    Atmospheric boundary layers become stably stratified at night over land when the surface becomes colder than the air layer above. In stable nocturnal boundary layers (SNBL), turbulence becomes weak and intermittent, terrain-induced phenomena such as drainage currents or gravity-waves emerge and the surface heterogeneity is enhanced. Because of their complexity...
    Resource Type:
    Dissertation
    Full Text:
    -Layer Meteorol. 5, 95-119. Vickers, D., and L. Mahrt, 2004: Evaluating formulations of stable boundary

  • An examination of structure and parameterization of turbulence in the stably-stratified atmospheric boundary layer

    Creator:
    Ruscher, Paul Harold
    Abstract:
    The very stable boundary layer is a region of the atmosphere typified by large vertical gradients of temperature and momentum. Analysis of very stable atmospheric flows is complicated by the presence of nonlinear interactions among gravity waves, shear-driven overturning circulations, two-dimensional vortical modes and intermittent turbulence in various stages of...
    Resource Type:
    Dissertation
    Full Text:
    5 too' f_ k:/'' 4 -[ r---- : / i: :: : J r / ,'Q - ,tf i I --"\ L.4, / ': A - \" 'U 2

  • Structure of turbulence in stratified flow : aircraft data from SESAME and ALPEX

    Creator:
    Gamage, Nimal K. K.
    Abstract:
    Several horizontal flight segments from SESAME and ALPEX are studied using structure functions and specral analysis methods. Theoretical analysis of the relative errors in structure function and correlation function in the presence of large scale wave activity is presented. The effect of stratification and shear on the -5/3 inertial subrange...
    Resource Type:
    Masters Thesis
    Full Text:
    , 239 pp. Mahrt, L., 1985: Vertical Structure and Turbulence in the Very Stable Boundary Layer, J

  • Turbulent structure in the bora and stable boundary layer

    Creator:
    Frank, Helmut P.
    Abstract:
    An eigenvector analysis of the velocity-temperature correlation matrix is applied to clear-air turbulence measured by aircraft in the Bora. The eigenvectors are identified with the main eddies of the turbulence. This study attempts to infer the three-dimensional structure of these eddies. The results are compared with turbulent structures in the...
    Resource Type:
    Masters Thesis
    Full Text:
    , L., 1985: Vertical structure and turbulence in the very stable boundary layer. J. Atmos. Sci., 42

  • A nonlocal mixing formulation for the atmospheric boundary layer

    Creator:
    Frech, Michael C.
    Abstract:
    A two-scale approach for the turbulent mixing of momentum in an unstable stratified boundary layer is proposed in an attempt to eliminate existing inconsistencies between parameterized mixing of heat and momentum. The parameterization of the large eddy stress is suitable for simple boundary layer models where computational efficiency is important....
    Resource Type:
    Masters Thesis
    Full Text:
    Mahrt. Thanks also to Michael Ek for the valuable discussions during the preparation of this thesis

  • Modelling and analysis of geophysical turbulence : use of optimal transforms and basis sets

    Creator:
    Gamage, Nimal K. K.
    Abstract:
    The use of efficient basis functions to model and represent flows with internal sharp velocity gradients, such as shocks or eddy microfronts, are investigated. This is achieved by analysing artificial data, observed atmospheric turbulence data and by the use of a Burgers' equation based spectral model. The concept of an...
    Resource Type:
    Dissertation
    Full Text:
    Mahrt The use of efficient basis functions to model and represent flows with internal sharp velocity

  • Turbulent and gravity wave transport in the free atmosphere

    Creator:
    Kim, Jinwon
    Resource Type:
    Dissertation
    Full Text:
    Gravity Wave Transport in the Free Atmosphere Abstract approved: Larry Mahrt Turbulent fluxes and