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.
Results
Showing 1 to 20 of 69 for “"downwelling"”.
-
Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
… different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly expanding relatively well mixed region near the shore and the second considered a steady flow that arises when an offshore …
-
Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
… different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly expanding relatively well mixed region near the shore and the second considered a steady flow that arises when an offshore …
-
Wind-driven circulation on a shallow, stratified shelf
… of inner shelf circulation during upwelling and downwelling. Variation in meteorological forcing on the North Carolina Inner shelf is shown to be dominated by synoptic weather systems. The structure of cold fronts, which are the dominant synoptic feature, and the local meteorological conditions …
-
Oceanic response observations due to passing tropical cyclones: an assessment of drag and sea spray parameterizations
… motivated attempting to replicate the apparent downwelling ahead of Hurricane Ignacio and three others—Irma, Florence and Michael, using the Price-Weller-Pinkel ½ order closure model, via comparisons of the depth of the 26°C isotherm, tropical cyclone heat potential and vertical velocity. When …
-
Fast food : the transport of particulate organic matter over an upwelling event on the west coast of southern Africa
… conditions, upwelling, relaxation and downwelling, were discemable from wind, current and temperature data at each site. Upwelling was most prevalent at Cape Columbine in contrast to relaxation at Elandsbaai. Significant differences (P < 0.00001) in chlorophyll a concentration, …
-
Control of the abyssal ocean overturning circulation by mixing-driven bottom boundary layers
… layer (BBL) along the sloping seafloor and downwelling in the stratified mixing layer (SML) above; their residual is the overturning circulation. This boundary-controlled circulation fundamentally alters abyssal tracer distributions, with implications for global climate. Chapter 1 describes …
-
Control of the abyssal ocean overturning circulation by mixing-driven bottom boundary layers
… layer (BBL) along the sloping seafloor and downwelling in the stratified mixing layer (SML) above; their residual is the overturning circulation. This boundary-controlled circulation fundamentally alters abyssal tracer distributions, with implications for global climate. Chapter 1 describes …
-
Physiological and ecological studies of mannitol utilizing marine bacteria
… on plates were monitored during upwelling and downwelling conditions.
-
Tectonic and magmatic processes during extension in planetary lithospheres : rifting, spreading, delamination, and recycling on Earth and Venus
… to driving forces such as the upwelling or downwelling of material in the mantle, especially for extensional systems. On Earth, the processes underpinning continental break-up are poorly understood despite decades of study. In this dissertation, I present a synthesis of numerical modeling, …
-
Vision and Bioluminescence in Cephalopods
… due to light scattering and absorption. Downwelling sunlight becomes exponentially dimmer, bluer, and more diffuse with depth. This optical structure means that an animal’s depth and viewing direction greatly affect the distances at which it can see visual targets such as potential prey …
-
Variable Viscosity Thermal Convection at Infinite Prandtl Number in a Thick Spherical Shell
… on temperature and pressure (depth). Linear downwellings and diffuse plume-like upwellings are dominant features in the numerical calculations. When Newtonian rheology is applied throughout the shell, depth- dependence of viscosity is the dominant rheological influence controlling the flow …
-
Oceanic response observations due to passing tropical cyclones : an assessment of drag and sea spray parameterizations
… motivated attempting to replicate the apparent downwelling ahead of Hurricane Ignacio and three others-Irma, Florence and Michael, using the Price-Weller-Pinkel 1/2 order closure model, via comparisons of the depth of the 26°C isotherm, tropical cyclone heat potential and vertical velocity. When …
-
Hydrographic Variability on Decadal and Interdecadal Scales in the Northern Gulf of Alaska
… upwelling in the central gulf (OSP) and enhanced downwelling along the coast (GAK 1). The seasonal and interannual variations of the GAK 1 temperatures and salinities reveal 1) a possible coupling between salinity, density and freshwater discharge and 2) a strong coupling between tem perature and …
-
Annual and Interannual Variability in the Wind Field and the Hydrography Along the Seward Line in the Northern Gulf of Alaska
… transport. On average Ekman transport produces downwelling while the transport due to Ekman pumping produces upwelling. The effect of the downwelling due to Ekman transport is apparent near the coast (0 - 20 km from the coast) at depths between 50 - 250 m. In this area there is a significant …
-
Effects of the composition of suspended particles in water on the photosynthetically usable radiation and remote-sensing reflectance
… The TSS is often empirically related to the downwelling irradiance (Ed) and above-surface remote-sensing reflectance (Rrs). However, the same TSS can result from different particle compositions, which are described by the particle size distribution (PSD). This implies that knowledge of TSS …
-
The Impacts of Wind Farms on Cumulus Development in the Central Great Plains
… the surface radiative balance by reflecting more downwelling solar radiation than absorbing upwelling terrestrial radiation. As boundary layer cumuli form from buoyant, moist plumes ascending from the surface, their growth may be hindered by the turbulent deformation of the plume by wind farms. A …
-
Turbulent interactions between stream flow and near-subsurface flow: a laboratory approach using particle image velocimetry and refractive index matching
… In particular, the cylinder produces strong downwelling into the bed upstream of its location and upwelling in discrete jets downstream. The velocity directions in the pore spaces reflect this upwelling and downwelling in the stream above. Mean velocities in the pore spaces beneath the …
-
The Variability of High-Frequency Motions and Their Interactions with the Mesoscale on the Mississippi Shelf
… are found to be suppressed by low-frequency downwelling that destroys or subdues the water column stratification. However, the correlation between mesoscale processes and high-frequency motions is not found at the mid-shelf and shelf break stations.</p>
-
Characterization of Pyranometer Thermal Offset and Correction of Historiacal Data
… used in networks around the world to measure downwelling and upwelling diffuse and total hemispherical broadband solar irradiances. PSP's present an offset in the signal, called thermal offset, produced by a radiation heat exchange between the glass dome, which defines the spectral throughput …
-
Discipline-Based Planetary Education Research and Computational Fluid Dynamics Analysis of Mars
… patterns resembled hot upwelling and cool downwelling which may be similar to subduction-like features. Furthermore, increasing the temperature of the hot boundaries resulted in faster, more rigorous convective motions and a hotter average temperature.</p>
Page 1 of 4