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RISOn Cost Functions in the Hybrid Variational–Ensemble Method
Publisher: American Meteorological Society
Abstract: n the hybrid variational?ensemble data assimilation schemes preconditioned on the square root of background covariance , is a linear map from the model space to a higher-dimensional space. Because of the use of the nonsquare ...
Forecasting a Large Number of Tropical Cyclone Intensities around Japan Using a High-Resolution Atmosphere–Ocean Coupled Model
Publisher: American Meteorological Society
Abstract: his work quantifies the benefits of using a high-resolution atmosphere?ocean coupled model in tropical cyclone (TC) intensity forecasts in the vicinity of Japan. To do so, a large number of high-resolution calculations ...
Numerical Simulation of the Diurnal Evolution of Tropical Island Convection over the Maritime Continent
Publisher: American Meteorological Society
Abstract: Numerical simulations of the diurnal evolution of tropical island convection observed during the Maritime Continent Thunderstorm Experiment (MCTEX) are performed using the Meteorological Research Institute nonhydrostatic ...
A Cloud-Resolving 4DVAR Assimilation Experiment for a Local Heavy Rainfall Event in the Tokyo Metropolitan Area
Publisher: American Meteorological Society
Abstract: cloud-resolving nonhydrostatic four-dimensional variational data assimilation system (NHM-4DVAR) was modified to directly assimilate radar reflectivity and applied to a data assimilation experiment using actual observations ...
Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part II: The Impacts of Land Use and Buildings
Publisher: American Meteorological Society
Abstract: orizontal convective rolls form in coastal areas around Sendai Airport during sea-breeze events. Using a building-resolving computational fluid dynamics model nested in an advanced forecast system with a data assimilation ...
Cloud-Resolving 4D-Var Assimilation of Doppler Wind Lidar Data on a Meso-Gamma-Scale Convective System
Publisher: American Meteorological Society
Abstract: he authors evaluated the effects of assimilating three-dimensional Doppler wind lidar (DWL) data on the forecast of the heavy rainfall event of 5 July 2010 in Japan, produced by an isolated mesoscale convective system (MCS) ...
Mesoscale Hybrid Data Assimilation System based on JMA Nonhydrostatic Model
Publisher: American Meteorological Society
Abstract: his paper discusses the benefits of using a hybrid ensemble Kalman filter and four-dimensional variational (4D-Var) data assimilation (DA) system rather than a 4D-Var system employing the National Meteorological Center ...
Toward Improved Forecasts of Sea-Breeze Horizontal Convective Rolls at Super High Resolutions. Part I: Configuration and Verification of a Down-Scaling Simulation System (DS3)
Publisher: American Meteorological Society
Abstract: orizontal convective rolls (HCRs) that develop in sea breezes greatly influence local weather in coastal areas. In this study, the authors present a realistic simulation of sea-breeze HCRs over an urban-scale area at a ...
The Variational Assimilation Method for the Retrieval of Humidity Profiles with the Wind-Profiling Radar
Publisher: American Meteorological Society
Abstract: Recently, a humidity estimation technique was developed by using the turbulence echo characteristics detected with a wind-profiling radar. This study is concerned with improvement of the retrieval algorithm for delineating ...
Evaluation of Cloud Microphysics in JMA-NHM Simulations Using Bin or Bulk Microphysical Schemes through Comparison with Cloud Radar Observations
Publisher: American Meteorological Society
Abstract: umerical weather prediction (NWP) simulations using the Japan Meteorological Agency Nonhydrostatic Model (JMA-NHM) are conducted for three precipitation events observed by shipborne or spaceborne W-band cloud radars. ...