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  • Atmospheric boundary layer coupling to midlatitude mesoscale sea surface temperature anomalies

    Creator:
    Thum, Nicolai
    Abstract:
    This thesis examines the mechanisms that couple the monthly-averaged atmospheric boundary layer (ABL) to open-ocean sea surface temperature (SST) perturbations on scales of 50-500 km. The observed positive correlation between surface wind speed anomalies and SST anomalies is successfully simulated using the Weather Research and Forecasting (WRF) model. In numerical...
    Resource Type:
    Dissertation
    Full Text:
    Boundary Layer Coupling to Midlatitude Mesoscale Sea Surface Temperature Anomalies Abstract approved

  • 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:
    turbulent bursts in the neutral atmospheric boundary layer. The VITA method is not optimal for our goal of

  • Turbulence structure within an inclined laboratory convection tank

    Creator:
    Nance, Jon D.
    Abstract:
    A baroclinic, convective mixed-layer was modeled, using water, in a laboratory convection tank identical to that used in the free convection study of Deardorff and Willis (1985). Baroclinicity and mean-flow shearing were achieved by tilting the tank by an angle of 1O⁰. The resulting mechanical-production rate of turbulence kinetic energy...
    Resource Type:
    Masters Thesis
    Full Text:
    boundary layer in a state of free convection (Willis and Deardorff, 1974; Deardorff and Willis, 1985) For

  • 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

  • Flow over surface discontinuities in a marine environment

    Creator:
    Moore, Erin M.
    Abstract:
    This study concentrates on analysis of LongEZ aircraft data taken offshore of the Atlantic Coast of the United States. Due to the land structure of the region, it was possible to isolate the effect of narrow land on air as it flows offshore. The narrow land (Outer Banks) separates inland...
    Resource Type:
    Masters Thesis
    Full Text:
    internal boundary layer (IBL) over land grows deeper and the eddies presumably grow larger. Larger eddies

  • 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:
    Formulation for the Atmospheric Boundary Layer Abstract approved: A two-scale approach for the turbulent

  • 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

  • Dynamics of a differentially-heated geophysical boundary layer

    Creator:
    Smith, Bartlett Knapp
    Abstract:
    An analytical two-layer model consisting of a time-dependent stratified boundary layer topped by stratified free flow is developed in order to study atmospheric boundary layer production of vertical motion. To avoid use of a constant eddy viscosity, the boundary layer equations are layer-integrated over a fixed depth, and surface stress...
    Resource Type:
    Masters Thesis
    Full Text:
    0 and p. Neglecting turbulent fluxes at the boundary layer top and layer-integrating equations (7

  • Influence of stratification and accelerations on boundary production of vertical motion

    Creator:
    Park, Soon-Ung
    Abstract:
    The influence of boundary layer pumping on an externally-forced synoptic-scale flow is examined. The results follow earlier theories of stratified incompressible Boussinesq flow. These theories state that the spin-down time scale and the penetration depth of the influence of boundary layer pumping are inversely proportional to the stratification and directly...
    Resource Type:
    Dissertation
    Full Text:
    turbulent diffusion of vorticity. Thus, boundary layer pumping is thought to be an important feedback

  • 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:
    Bora and Stable Boundary Layer Abstract approved: Larry Mahrt An eigenvector analysis of the