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  • 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:
    . Unfortunately fluxes have not been adequately sampled in the very stable boundary layer and little observation

  • A study of the relationship between ageostrophy and dynamical periodicities of the tropical Pacific Boundary Layer

    Creator:
    McCandlish, Cole B.
    Abstract:
    Eight years (1980-87) of twice-daily high-resolution radiosonde data from a tropical mid-Pacific island station are analyzed to generate time series of the planetary boundary layer (PBL) top pressure, an ageostrophic parameter (related to the divergence), and a parameter of mean PBL specific humidity. Sample spectra of these time series are...
    Resource Type:
    Masters Thesis
    Full Text:
    Relationship Between Ageostrophy and Dynamical Periodicities of the Tropical Pacific Boundary Layer Abstract

  • Transpiration and the atmospheric boundary layer : progress in modeling feedback mechanisms

    Creator:
    Heinsch, Faith Ann
    Abstract:
    Simple models of transpiration, e.g., the Penman-Monteith equation, treat atmospheric conditions as driving variables. In fact, transpiration modifies temperature and humidity throughout the convective boundary layer, creating feedbacks that stabilize the water use of vegetation. This thesis concentrates on the new empirical relationships proposed by Monteith (1995), for developing simple...
    Resource Type:
    Masters Thesis
    Full Text:
    the Atmospheric Boundary Layer: Progress in Modeling Feedback Mechanisms. Abstract approved: Simple

  • Turbulent and gravity wave transport in the free atmosphere

    Creator:
    Kim, Jinwon
    Resource Type:
    Dissertation
    Full Text:
    stable boundary layer ................... 18 Vertical profiles of (a) u, (b) v, and (c) 0 in the

  • On Symmetric Instabilities in Oceanic Bottom Boundary Layers

    Creator:
    Allen, J. S. and Newberger, P. A.
    Abstract:
    Model studies of two-dimensional, time-dependent, wind-forced, stratified downwelling circulation on the continental shelf have shown that the near-bottom offshore flow can develop time- and space-dependent fluctuations involving spatially periodic separation and reattachment of the bottom boundary layer and accompanying recirculation cells. Based primarily on the observation that the potential vorticity...
    Resource Type:
    Article
    Full Text:
    - tuations involving spatially periodic separation and reattachment of the bottom boundary layer and

  • Dynamics of the nearshore wave bottom boundary layer

    Creator:
    Foster, Diane Lyn
    Abstract:
    This thesis presents an examination of the nearshore wave bottom boundary layer under conditions of significant sediment response. Using both field observations and simple models, the response of the bottom boundary layer to random waves is shown to have a complex behavior. First, the linearized wave bottom boundary layer governing...
    Resource Type:
    Dissertation
    Full Text:
    Dynamics of the nearshore wave bottom boundary layer AN

  • Spectral integration and the numerical solution of two-point boundary value problems

    Creator:
    Norris, Gordon F.
    Abstract:
    Spectral integration methods have been introduced for constant-coefficient two-point boundary value problems by Greengard, and pseudospectral integration methods for Volterra integral equations have been investigated by Kauthen. This thesis presents an approach to variable-coefficient two-point boundary value problems which employs pseudospectral integration methods to solve an equivalent integral equation. This...
    Resource Type:
    Masters Thesis
    Full Text:
    is nearly zero over most of the interval and possesses a sharp boundary layer at the right endpoint

  • The use of conserved variables in the modeling and parameterization of shallow cumulus trade wind boundary layers

    Creator:
    Barbour, Philip L. (Philip Lee), 1960-
    Abstract:
    A time dependent model of the shallow, tropical convective boundary layer is developed and tested. To simplify the treatment of thermodynamic processes and return to first principles of physics, conserved quantities of entropy and total water density are used as primary model variables. In addition, a new shallow cumulus parameterization...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: A time dependent model of the shallow, tropical convective boundary layer is developed

  • Daytime Evolution of Relative Humidity at the Boundary Layer Top

    Creator:
    Ek, M. and Mahrt, L.
    Abstract:
    Data from the Hydrological and Atmospheric Pilot Experiment-Modélisation du Bilan Hydrigue (HAPEX-MOBILHY) field program and results from a one-dimensional model of the soil and atmospheric boundary layer are analyzed to study the daytime evolution of the relative humidity at the boundary layer top. This evolution is thought to control the...
    Resource Type:
    Article

  • Eddy Asymmetry in the Sheared Heated Boundary Layer

    Creator:
    Mahrt, L.
    Abstract:
    Statistical measures are developed to study the influence of mean shear on the asymmetry of eddy updrafts as observed from low-level aircraft flights in HAPEX, FIFE, and SESAME. This asymmetry involves formation of microfronts between updrafts with slow horizontal motion and downdrafts with faster horizontal motion. The variance of the...
    Resource Type:
    Article