Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 76 for “"Atmospheric Boundary Layer"”.
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The atmospheric boundary layer above the Agulhas current
This thesis describes the atmospheric boundary layer above the Agulhas Current using shipboard meteorological measurements and rawinsonde ascents. The juxtaposition of the warm Agulhas Current and cool shelf waters is shown to have far-reaching effects on the overlying atmosphere. Air-sea fluxes of …
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Quasi-coherent structures in the marine atmospheric boundary layer
… structures amidst the chaos of a turbulent boundary layer. It has been observed that a quasi-periodic phenomena called "bursting" accounts for a major contribution to the turbulent Reynolds stress and the production of turbulent kinetic energy. Bursting is the term used for a sequence of …
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A time-varying subsidence parameterization for the atmospheric boundary layer
… parameterization for subsidence in the atmospheric boundary layer (ABL) on a one-dimensional coupled land-atmosphere model. Measurements of large-scale divergence in the ABL are scarce and often marred by error, providing the motivation to model this important physical process and …
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Energetics and similarity theory in the wave-affected atmospheric boundary layer
… sensors are used in this analysis to examine atmospheric fluxes occurring within the wave-affected boundary layer (WBL). Using Monin-Obukhov (MO) Similarity Theory, we analyzed the fluxes and energy balance under different atmospheric stability conditions. Through a comparison of …
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Transport Processes of Reactive Trace Gases in the Atmospheric Boundary Layer
Transport of trace gases within the atmospheric boundary layer plays a key role in feedback processes between the earth’s surface and the atmosphere and consequently in ecosystem budgets of carbon and nitrogen (among many more). For a correct quantification of the exchange between surface and …
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Statistical Scaling of Turbulent Surface Pressure in the Atmospheric Boundary Layer
… These fluctuations are of interest both to atmospheric scientists, as a fluid dynamic property, and to acousticians, as a source of wind noise. At the ground surface, previous work has found the dominant source of pressure fluctuations to be an interaction of the turbulent vertical velocity …
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Land-atmosphere Exchange and Air Quality during Stable Atmospheric Boundary Layer Events
… have been observed under conditions with stable atmospheric boundary layers. The multiday stagnant meteorological conditions, especially the vertical structure of the atmospheric boundary layer (ABL) below 1 km in the atmosphere, have been notoriously difficult to capture using numerical weather …
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Study of the atmospheric boundary layer processes over sloping terrain covered by sparse canopy
… varying surface roughness, and a wide range of atmospheric thermal conditions. The surface roughness object of the research is a sparse canopy layer evolving in time along the vegetative season, and characterized by a multiplicity of temporal and spatial scales influencing the properties of the …
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Description of Coherent Structures in the Atmospheric Boundary Layer By Model Reduction of the Surface Pressure
… and temporal coherence of local features in the atmospheric boundary layer. In each case, modes were identified that can be associated with wave-like pressure fluctuations that propagate either at convective or acoustic speeds.</p>
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Variational sensitivity analysis and data assimilation studies of the coupled land surface-atmospheric boundary layer system
… mutual dependence of these fluxes on surface and atmospheric states, the land and boundary layer comprise a coupled system with complicated interactions and feedbacks which are significant factors in modulating the variability of the weather and climate. In this thesis we develop a framework for …
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Numerical Simulation Of The Atmospheric Boundary Layer Over Complex Topography: A Modern Approach To A Classical Problem
… were developed and validated to simulate the atmospheric boundary layer (ABL) using large eddy simulation (LES). This framework captures the topography of the Earth’s surface rather than modeling it. To robustly simulate the ABL, four unique capabilities (temperature transport, topographic …
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Estimating atmospheric boundary layer turbulence in the marine environment using lidar systems with applications for offshore wind energy
Estimating turbulence in the marine-atmospheric boundary layer is critical to many industrial, commercial and scientific fields, but of particular importance to the wind energy industry. Contributing to both the efficiency of energy extraction and the life-cycle cost of the turbine itself, …
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The behavior of the atmospheric boundary layer in the vicinity of the Gulf Stream sea surface temperature front
The evolution of the marine atmospheric boundary layer (MABL) in the vicinity of a sea surface temperature (SST) front is of particular research interest, as the large air-sea temperature and humidity differences at the surface fuels various physical processes inside the boundary layer, causing …
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The variability of the marine atmospheric boundary layer in the Greenland Sea marginal ice zone a case study.
The vertical structure of the atmospheric boundary layer in the East Greenland Sea Fram Strait marginal ice zone (MIZ) is examined for various wind flow regimes with respect to the ice edge. Rawinsonde profiles and surface observations collected from three ships during MIZEX-87 (20 March - 11 April …
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Estimating atmospheric boundary layer turbulence in the marine environment using lidar systems with applications for offshore wind energy
Estimating turbulence in the marine-atmospheric boundary layer is critical to many industrial, commercial and scientific fields, but of particular importance to the wind energy industry. Contributing to both the efficiency of energy extraction and the life-cycle cost of the turbine itself, …
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The Behavior of the Atmospheric Boundary Layer in the Vicinity of the Gulf Stream Sea Surface Temperature Front
The evolution of the marine atmospheric boundary layer (MABL) in the vicinity of a sea surface temperature (SST) front is of particular research interest, as the large air-sea temperature and humidity differences at the surface fuels various physical processes inside the boundary layer, causing …
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An experimental study of the atmospheric boundary layer modified by a change in surface roughness and surface temperature
… stable air is heated from below, and an internal boundary layer (IBL) with an unstable stratification develops within the stable layer which originated over the ocean. As this flow moves inland the IBL grows vertically depending on changes in surface roughness and surface temperature. Eventually, …
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Modelling the marine boundary layer for offshore wind power utilisation
… with modelling the structure of the marine atmospheric boundary layer, with focus on effects, which are important for wind resource assessment. Data from the offshore measurement program Rodsand in the Danish Baltic Sea have been used for the analysis. The core of the work is the …
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