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 25 for “"turbulent fluxes,"”.
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Free convection and turbulent fluxes over complex terrain
… of the Black Forest, southwestern Germany. Turbulent fluxes were calculated with the eddy-covariance (EC) method and were used to detect FCCs with the help of a stability parameter. The flux measurements were further combined with ABL profiling measurements (Sodar/RASS) and a large-eddy …
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Site-specific modelling of turbulent fluxes on the Tibetan Plateau
… step, particular issues about data quality of turbulent fluxes (sensible heat flux and latent heat flux/evapotranspiration) at Tibetan Plateau sites have been addressed. One of them is the degradation of data quality due to the frequent occurrence of near-ground free convective conditions. …
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Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
… (CBLAST-Low). Observations were made of turbulent fluxes, turbulent kinetic energy, and the length scales of flux-carrying and energy-containing eddies in the ocean surface boundary layer. A new technique was developed to separate wave and turbulent motions spectrally, using ideas for …
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Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
… (CBLAST-Low). Observations were made of turbulent fluxes, turbulent kinetic energy, and the length scales of flux-carrying and energy-containing eddies in the ocean surface boundary layer. A new technique was developed to separate wave and turbulent motions spectrally, using ideas for …
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Quality Assurance for Eddy Covariance Measurements of Turbulent Fluxes and its Influence on the Energy Balance Closure Problem
… covariance method enables direct measurements of turbulent fluxes at the earth’s surface. Such measurements are required to study the surface energy balance and the exchange of gaseous air constituents. Due to improvements in the construction of adequate sensors and the progress in computer …
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Vertical air profiling in False Bay
… micrometeorology mainly constitutes vertical turbulent fluxes of parameters such as momentum, heat, water vapour and aerosols. These turbulent fluxes have been tested in the laboratory and can be applied to the atmospheric changes over the ocean, where wind speed, the air-sea temperature …
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Land-atmosphere Exchange and Air Quality during Stable Atmospheric Boundary Layer Events
… winter. This dissertation analyzes the surface turbulent characteristics from observations and evaluates the numerical model performances using the Weather Research and Forecasting (WRF) model and the Community Multiscale Air Quality Modeling (CMAQ) System. The objective of this research is to …
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Eddy-covariance measurements as a tool for ecological and hydrological studies on the Tibetan Plateau
… studies that can be assessed by measurements of turbulent fluxes with the eddy-covariance (EC) method. This includes flux measurements over the most common two vegetation types on the TP, Kobresia pygmaea pasture and alpine steppe. In particular these in situ measurements were used to investigate …
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Assessing and Improving the Representation of Hydrologic Processes in Atmospheric, Ocean, and Land Modeling and Dataset Generation
… the depiction of three phenomena, ocean surface turbulent fluxes, humidity inversions, and groundwater, are assessed, and suggestions for improvements of their representations are made. First, ocean surface turbulent fluxes, including those of moisture (latent heat flux), heat (sensible heat …
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The Effect of Persistent Vortices on Boundary Layer Behavior in Turbulent Flow along a Kelvin-Stuart Cat's Eyes Wavy Wall
… vortex near a wall will reduce the wall fluxes in turbulent flows. To test the theory flow visualization and hot-wire experiments in a water tunnel at moderate Reynolds number reveal that a persistent vortex will relaminarize the boundary layer along wavy even in the presence of …
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Numerical Simulation of Thermohaline Convection in the Mixed Layer of the Ocean
… of solar heating, horizontal advectlon, and turbulent fluxes at the sea surface, while wind mixing enter through the use of depth-dependent eddy diffusion coefficients resulting from the wave-orbital shear model of KitaigorodsldLy. All inputs are treated as functions of time-of-day, or …
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Surface-Atmosphere coupling over the central Arctic Ocean
… and microphysical properties and the surface turbulent fluxes. The Arctic Ocean Experiment (AOE) 2001 and the Arctic Summer Cloud-Ocean Study (ASCOS) 2008 took place in the central Arctic Ocean during the late summer/early freeze-up period. The aim of both campaigns was to improve the …
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A numerical investigation of collisionality and turbulent transport
An investigation of collisionality's role in turbulent transport in magnetized plasma using the GS2 gyrokinetic simulation software is presented. The investigation consists of three parts, conducted by way of numerical modeling: 1) input calibration using the conditions and results of a reference …
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Study of the atmospheric boundary layer processes over sloping terrain covered by sparse canopy
… spatial scales influencing the properties of the turbulent fluxes. Both experimental and modelling approaches characterize the study methodology. Measurements are first performed in laboratory in order to calibrate flux sensors (i.e., ultrasonic anemometers), and subsequently into three N-W Italy …
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On the role of high frequency waves in ocean altimetry
… radar backscatter, the atmospheric flow, and turbulent fluxes within the marine boundary layer. This uncommon ensemble provides the means to address several specific altimeter-related topics. First, we examine and document the impact that non wind-driven gravity wave variability, e.g. swell, …
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Numerical Model Simulation of Offshore Flow During the Winter Season
… with the use of a K-theory profile for the turbulent fluxes in the marine planetary boundary layer were isolated. The initial air-sea temperature difference and the K-theory formulations were crucial to the computational stability of the model as well as the resolution of the model, even …
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High-Resolution Modelling of Surface-Atmosphere Interactions and Convection Development at Nam Co Lake, Tibetan Plateau
… and specifically the exchange of momentum, turbulent energy and water vapour as well as the development of convection are not only important for the surface energy balance and local water resources, but also have influence on the evolution of the monsoon system and climate. High-resolution, …
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Marine atmospheric influences on trace gas observations and transport during the ICARTT 2004 campaign
… suggesting that additional parameters like turbulent fluxes or surface roughness are required to determine SIBL development in the region.</p>
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On optical and physical properties of sea ice in the Baltic Sea
… in the oceans with equal ice growth rates. The turbulent fluxes of heat and salinity under the landfast sea ice were measured to be small.
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Investigation of the Influence of Temperature Inversions and Turbulence on Land-atmosphere Interactions for Rolling Terrain
… quality. The models used for estimating surface fluxes such as heat, moisture, and carbon dioxide (CO2) were designed to work best in horizontally uniform, flat terrain. This is a challenge for measuring surface fluxes in non-uniform, complex terrain as these models break down especially during …
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