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RISSingular Vector Structure and Evolution of a Recurving Tropical Cyclone
Publisher: American Meteorological Society
Abstract: In this study, the structure and evolution of total energy singular vectors (SVs) of Typhoon Usagi (2007) are evaluated using the fifth-generation Pennsylvania State University?NCAR Mesoscale Model (MM5) and its tangent ...
Evaluation of a regional reanalysis and ERA-Interim over East Asia using in situ observations during 2013-2014
Publisher: American Meteorological Society
Abstract: n this study, the East Asia Regional Reanalysis (EARR) is developed for the period 2013-2014 and characteristics of the EARR are examined compared to ERA-Interim (ERA-I) reanalysis. The EARR is based on the Unified Model ...
Influence of Moist Physics and Norms on Singular Vectors for a Tropical Cyclone
Publisher: American Meteorological Society
Abstract: In this study, the structures and growth rates of singular vectors (SVs) for Typhoon Usagi were investigated using different moist physics and norms. The fifth-generation Pennsylvania State University?National Center for ...
Forecast Sensitivity Observation Impact in the 4DVAR and Hybrid-4DVAR Data Assimilation Systems
Publisher: American Meteorological Society
Abstract: AbstractIn this study, the observation impacts on 24-h forecast error reduction (FER), based on the adjoint method in the four-dimensional variational (4DVAR) data assimilation (DA) and hybrid-4DVAR DA systems coupled with ...
Dependence of Singular Vector Structure and Evolution on the Choice of Norm
Publisher: American Meteorological Society
Abstract: A diagnosis of singular vector (SV) evolution in the Eady model for the potential enstrophy and energy norms is performed using potential vorticity (PV) inversion and Eliassen?Palm (E?P) flux diagnostics, and compared with ...
Characteristics of Initial Perturbations in the Ensemble Prediction System of the Korea Meteorological Administration
Publisher: American Meteorological Society
Abstract: n this study, the initial ensemble perturbation characteristics of the new Korea Meteorological Administration (KMA) ensemble prediction system (EPS), a version of the Met Office Global and Regional Ensemble Prediction ...
Effect of Assimilating Himawari-8 Atmospheric Motion Vectors on Forecast Errors over East Asia
Publisher: American Meteorological Society
Abstract: AbstractIn this study, the effect of assimilating Himawari-8 (HIMA-8) atmospheric motion vectors (AMVs) on forecast errors in East Asia is evaluated using observation system experiments based on the Weather Research and ...
Effect of Boundary Conditions on Adjoint-Based Forecast Sensitivity Observation Impact in a Regional Model
Publisher: American Meteorological Society
Evaluation of Short-Range Precipitation Reforecasts from East Asia Regional Reanalysis
Publisher: American Meteorological Society
Abstract: As the need for regional reanalyses emerged around the world, a short period of the East Asia Regional Reanalysis (EARR) system was recently developed based on the Unified Model (UM). In this study, the quality of the EARR ...
Evolution of Analysis Error and Adjoint-Based Sensitivities: Implications for Adaptive Observations
Publisher: American Meteorological Society
Abstract: The structure and evolution of analysis error and adjoint-based sensitivities [potential enstrophy initial singular vectors (SVs) and gradient sensitivities of the forecast error to initial conditions] are compared following ...