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Optimizing Lidar Scanning Strategies for Wind Energy Turbulence Measurements
(2015-05-08)
Turbulence has a significant effect on wind farm power production and turbine reliability. Since remote sensing devices, such as lidars, are commonly used in wind energy studies, the accurate measurement of turbulence with ...
ENSEMBLE KALMAN FILTER METHODS FOR CONVECTIVE-SCALE RADAR DATA ASSIMILATION AND MULTI-SCALE DATA ASSIMILATION OF THE 13 JUNE 2010 TORNADIC SUPERCELL ENVIRONMENT
(2014-08-15)
Ensemble data assimilation at convective-scales will need to solve a number of scientific and technical issues prior to being usable for operational numerical weather prediction. This research contributes to this goal by ...
The Role of Surface Drag in Supercell Tornadogenesis and Mesocyclogenesis: Studies Based on Idealized Numerical Simulations
(2017-05)
Idealized numerical simulations of supercell thunderstorms have been employed for several decades to study tornadogenesis, providing valuable insights that have helped shape our current understanding of the process. Until ...
Observations and Simulations of Moisture Changes Occurring Around Sunset at the ARM Climate Research Facility
(2018-05-11)
Each summer, the U.S. Southern Great Plains (SGP) hosts a variety of ingredients (e.g. moisture, shear, instability, and lift) critical to understanding the life-cycle of deep, moist convection. Past studies have primarily ...
ASSIMILATION OF ATTENUATED DATA FROM X-BAND NETWORK RADARS USING ENSEMBLE KALMAN FILTER
(2013)
To use reflectivity data from X-band radars for quantitative precipitation estimation and storm-scale data assimilation, the effect of attenuation must be properly accounted for. Traditional approaches try to make correction ...
Optimal Design of a Multi-scale Ensemble System for Convective Scale Probabilistic Forecasts: Data Assimilation and Initial Condition Perturbation Methods
(2014-12-12)
This dissertation research was undertaken to better understand the optimal design of convection-permitting storm-scale ensemble forecast (SSEF) systems that resolve features ranging from synoptic to convective scales. The ...
Polarimetric and Rapid-Scan Radar Observations of Tornadoes
(2019)
Tornadoes are capable of lofting large pieces of debris that present irregular shapes, near-random orientations, and a wide range of dielectric constants to polarimetric radars. While ties between tornadic debris signature ...
Relationships between Monthly Agroclimate Variability and Local Crop Yield in the Central and Eastern United States and Southern Canada
(2015-05-08)
Short-term agroclimate is defined here as the monthly-to-seasonal meteorological, geological, biological, and psychological factors that modulate local and regional crop yield. Modern agricultural production in the central ...
Improving High-Resolution Tropical Cyclone Prediction using a Cycled, GSI-Based Hybrid Ensemble-Variational Data Assimilation System for HWRF with Vortex Scale Observations
(2019-12-13)
A Gridpoint Statistical Interpolation analysis system (GSI)-based, continuously cycled, dual-resolution hybrid ensemble-variational (EnVar) data assimilation (DA) system is developed for the Hurricane Weather Research and ...
A Synoptic and Dynamic Climatology of Heavy Midlatitude Rainfall: Trends Across the United States from 1950-2009
(2010)
The increasing regularity and intensity of heavy precipitation events across the United States during the latter part of the 20th century is widely recognized. Many climate models predict continued growth in the proportion ...