Browsing OU - Theses by Subject "Data Assimilation"
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A Comparative Convective Study Between the Ensemble Kalman Filter and the Local Particle Filter Using the Gridpoint Statistical Interpolation System
(2020-07-30)The localized particle filter (LPF) is a recent advance in ensemble data assimilation for numerical weather prediction. Derived from the original particle filter used for highly nonlinear state variables, the LPF incorporates ... -
A Comparison of Hybrid-4DEnVar and Hourly Hybrid-3DEnVar Assimilation of Tail Doppler Radar Observations on the Prediction of Rapidly Evolving Hurricanes
(2019-08-01)Beginning in the summer of 2017 the National Weather Service upgraded the operational Hurricane WRF (HWRF) to a continuously cycled Gridpoint Statistical Interpolation (GSI) based, 6-hourly, Hybrid 3-dimensional (3D) ... -
Impact of Assimilating Ground-Based and Airborne Radar Observations for the Analysis and Prediction of the Eyewall Replacement Cycle of Hurricane Matthew (2016) Using HWRF Hybrid 3DEnVar System
(2021-08-05)Eyewall replacement cycles (ERC) are common dynamical processes in mature tropical cyclones (TCs) that can result in quick changes to the storm’s intensity and wind field size. As the resolution of TC models increases, ... -
Impact of data assimilation and model physics on the predictability of the 2012 Great Arctic Cyclone
(2022-08-04)Impact of data assimilation and model physics on the predictability of the 2012 Great Arctic Cyclone A case study of the Great Arctic Cyclone 2012 (AC12) is used to understand the role of initial condition errors and model ... -
TEST OF DIFFERENT TRANSFORMATION FUNCTIONS TO HYDROMETEOR AND WATER VAPOR MIXING RATIOS FOR DIRECT VARIATIONAL ASSIMILATION OF RADAR REFLECTIVITY DATA
(2021-05-14)Many issues exist when using highly nonlinear radar reflectivity forward observation operator in three-dimensional variational data assimilation methods (3DVAR), especially with hydrometeor mixing ratios as control variables ...