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RISAssimilation of Tropical Cyclone Advisory Minimum Sea Level Pressure in the NCEP Global Data Assimilation System
Publisher: American Meteorological Society
Abstract: he assimilation of official advisory minimum sea level pressure observations has been developed and tested in the National Centers for Environmental Prediction (NCEP) Global Data Assimilation System (GDAS) to address ...
An OSSE-Based Evaluation of Hybrid Variational–Ensemble Data Assimilation for the NCEP GFS. Part I: System Description and 3D-Hybrid Results
Publisher: American Meteorological Society
Abstract: n observing system simulation experiment (OSSE) has been carried out to evaluate the impact of a hybrid ensemble?variational data assimilation algorithm for use with the National Centers for Environmental Prediction (NCEP) ...
An OSSE-Based Evaluation of Hybrid Variational–Ensemble Data Assimilation for the NCEP GFS. Part II: 4DEnVar and Hybrid Variants
Publisher: American Meteorological Society
Abstract: his work describes the formulation of a hybrid four-dimensional ensemble--variational (4DEnVar) algorithm and initialization options utilized within the National Centers for Environmental Prediction global data assimilation ...
Interpretation of the Structure and Evolution of Adjoint-Derived Forecast Sensitivity Gradients
Publisher: American Meteorological Society
Abstract: A 36-h adjoint-based forecast sensitivity study of three response functions defined in the lower troposphere?average temperature in an isolated region of the upper Midwest (R1), meridional temperature difference (R2), and ...
Application of Adjoint-Derived Forecast Sensitivities to the 24–25 January 2000 U.S. East Coast Snowstorm
Publisher: American Meteorological Society
Abstract: The 24?25 January 2000 eastern United States snowstorm was noteworthy as operational numerical weather prediction (NWP) guidance was poor for lead times as short as 36 h. Despite improvements in the forecast of the surface ...
A Simultaneous Multiscale Data Assimilation Using Scale-Dependent Localization in GSI-Based Hybrid 4DEnVar for NCEP FV3-Based GFS
Publisher: American Meteorological Society
Predictions of 2010’s Tropical Cyclones Using the GFS and Ensemble-Based Data Assimilation Methods
Publisher: American Meteorological Society
Abstract: xperimental ensemble predictions of tropical cyclone (TC) tracks from the ensemble Kalman filter (EnKF) using the Global Forecast System (GFS) model were recently validated for the 2009 Northern Hemisphere hurricane season ...
The Impact of Supplemental Dropwindsonde Data on the Structure and Intensity of Tropical Storm Karen (2013) in the NCEP Global Forecast System
Publisher: American Meteorological Society
Abstract: he impact of assimilating synoptic surveillance dropwindsonde data on the analysis and forecast of the structure and intensity of Tropical Storm Karen (2013) was examined. Data-denial experiments were conducted using the ...
Introduction of the GSI into the NCEP Global Data Assimilation System
Publisher: American Meteorological Society
Abstract: At the National Centers for Environmental Prediction (NCEP), a new three-dimensional variational data assimilation (3DVAR) analysis system was implemented into the operational Global Data Assimilation System (GDAS) on 1 ...
Improving Incremental Balance in the GSI 3DVAR Analysis System
Publisher: American Meteorological Society
Abstract: The gridpoint statistical interpolation (GSI) analysis system is a unified global/regional three-dimensional variational data assimilation (3DVAR) analysis code that has been under development for several years at the ...