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 33 for “"Vertical Wind Shear"”.
-
Radar-derived Thermodynamic Structure of a Major Hurricane in Vertical Wind Shear
… pressure and temperature fields along with the wind and precipitation structure of Hurricane Rita emphasize the impact of vertical wind shear on the azimuthal location of convection in the eyewall and show the dynamic and thermodynamic processes that act to balance the vortex tilt. Analysis of …
-
An examination of the large-scale drivers of North Atlantic vertical wind shear and seasonal tropical cyclone variability
… driving tropical North Atlantic deep-layer vertical wind shear (VWS). VWS is a key variable for the seasonal prediction of tropical cyclone (TC) activity and can be used to assess sources of predictability within a given season. Part 1 of the dissertation examines tropical versus subtropical …
-
Sea Surface Temperatures and Vertical Wind Shear as Precursors to Tropical Cyclone Activity in the Caribbean and an Expanding Main Developing Region
<p>Sea surface temperatures and vertical wind shear are essential to tropical cyclone formation. TCs need warm SSTs and low shear for genesis. Increasing SSTs and VWS changes influence storm development. This work analyzes SST and VWS trends for the Caribbean, surrounding region, and the Atlantic …
-
Impacts of cold pool strength on tornado production in quasi-linear convective systems
… environments, particularly with instability and vertical wind shear. However, such studies have been limited to cases from field projects and thus exhibit a small domain and sample size. To bridge this gap, this study investigates cold pool strength and pre-convective line vertical wind shear for …
-
The effects of entrainment in the developing and rotating stages of supercell thunderstorms
… focused upon cumuli in environments with minimal vertical wind shear. Little attention has been given to investigating the entrainment into developing thunderstorms growing in environments with strong vertical wind shear, or to how rotating updrafts in some thunderstorms (i.e. supercells; produced …
-
Effects of environmental shear and buoyancy on simulated supercell interactions
This study examines the role that buoyancy and vertical wind shear play in modulating the relationship between storm interactions and storm severity. Using an idealized numerical model, 240 supercell interactions are simulated under systematically varied amounts of buoyancy and vertical wind shear. …
-
Quantifying entrainment and dilution in numerical simulations of developing thunderstorms
… have shown that in environments with significant vertical wind shear, the down-shear circulation is stronger. It has been hypothesized that greater entrainment (and thus dilution) occurs in stronger shear environments, but this relationship has not been suitably demonstrated with direct …
-
THE APPLICATION OF THE MARSUPIAL AND ROTATING CONVECTION PARADIGMS TO UNDERSTANDING THE TROPICAL CYCLOGENESIS AND INTENSIFICATION OF HURRICANE MICHAEL (2018)
… meteorological conditions, including strong vertical wind shear and the absence of classic Cape Verde–type characteristics. Data from the NOAA Global Forecast System (GFS), NOAA satellite imagery, and upper-air soundings are analyzed to investigate precursors to the storm’s formation. Results …
-
A theory of the mesoscale organization of moist convection and the associated vertical momentum transport
… between the updraft and the environmental wind. The orientation, aspect ratio, phase speed and size of the organized convection are determined. These quantities depend on the vertical wind-shear and the stratification. GATE, ARM, EMEX, SCSMEX, and TOGA COARE data are used to test the …
-
The Effects of Low-Level Wind Shear Orientation, Depth, and Magnitude on Low-Level Rotation in Simulated Supercell Thunderstorms
… CM1 are used to analyze the effects of low-level vertical wind shear on near-ground rotation in the storm. In particular, the parameters being assessed are the orientation, magnitude, and depth of the low-level vertical wind shear. Particular emphasis is given to the effects of the shear in …
-
Numerical Simulations of a Midlatitude Squall Line
… common temperature and moisture profiles in the vertical, and emphasis was placed on varying the microphysics and the vertical wind shear. The temperature and moisture profiles chosen were adapted from the environmental conditions which were present prior to the development of the 22 May 1976 …
-
How does terrain influence the upscale convective growth of orographic deep moist convection?
… available potential energy and weaker low-level vertical wind shear compared to the United States. One of the more intriguing results is the relatively fast transition, and close proximity to terrain, from first storms to larger mesoscale convective systems compared with locations in the United …
-
Formation and maintenance of tropical cyclone spiral bands in idealized numerical simulations
… between surface cold pools and low-level vertical wind shear. Despite much effort, no consensus has yet been reached on the underlying physical mechanism responsible for TC bands. We approach this problem by examining the formation of TC spiral bands in a set of idealized three-dimensional …
-
Midlevel ventilation's constraint on tropical cyclone intensity
… a hypothesized mechanism by which environmental vertical wind shear can constrain a TC's intensity. An idealized framework is developed to assess how ventilation affects TC intensity via two pathways: downdrafts outside the eyewall and eddy fluxes directly into the eyewall. Three key aspects are …
-
Effects of Inflow Parameters and Operating Conditions on the Structural Response and Power Production of a Commercial Wind Turbine
Onshore wind farms can experience a wide variety of wind conditions, even in simple or flat terrain, as a result of diurnal and seasonal changes in stability in the atmospheric boundary layer. At a farm in Southwestern Ontario, a commercial-sized wind turbine operates in close proximity to a …
-
Relationships between global warming and tropical cyclone activity in the Western North Pacific
… surface temperature (SST) exceeding 26oC Weak vertical shear in horizontal winds Large positive absolute vorticity at low levels Mean upward motion High mid-level humidity We separate the data into weekly 5ox5o region averages. Using a least squares fit, we identify global warming signals in …
-
An investigation of the development of supercells in the Indiana and Ohio tornado outbreak of 24 August 2016 using a WRF model simulation
… their first tornadoes. The third was a westerly wind shift behind the outflow boundary that triggered a second round of supercells, some of which also produced tornadoes. A mesoscale convective vortex, also owing to storms from the previous evening, moved across northern Illinois and Indiana …
-
Controls of updraft size, cold pool characteristics, and potential tornado intensity in supercell thunderstorms
… width is strongly dependent on environmental vertical wind shear, dependent on the boundary layer depth (as well as corresponding changes to CAPE) of the storm environment, yet relatively insensitive to the characteristics of convection initiation mechanisms. This study also find that the …
-
Detection and Analysis of Coherent Structures within and above Tall-vegetated Canopies
… scales of coherent structures in the horizontal wind velocity, the sonic temperature and the concentration of carbon dioxide and water vapour exceed those of the vertical wind velocity. Within the canopy, the temporal scales of all vector and scalar variables collapse at approx. 24 s to 28 s …
Page 1 of 2