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RISObservation Sensitivity Calculations Using the Adjoint of the Gridpoint Statistical Interpolation (GSI) Analysis System
Publisher: American Meteorological Society
Abstract: The adjoint of a data assimilation system provides an efficient way of estimating sensitivities of analysis or forecast measures with respect to observations. The NASA Global Modeling and Assimilation Office (GMAO) has ...
Impact of Parameter Estimation on the Performance of the FSU Global Spectral Model Using Its Full-Physics Adjoint
Publisher: American Meteorological Society
Abstract: The full-physics adjoint of the Florida State University Global Spectral Model at resolution T42L12 is applied to carry out parameter estimation using an initialized analysis dataset. The three parameters, that is, the ...
Performance of 4D-Var with Different Strategies for the Use of Adjoint Physics with the FSU Global Spectral Model
Publisher: American Meteorological Society
Abstract: A set of four-dimensional variational data assimilation (4D-Var) experiments were conducted using both a standard method and an incremental method in an identical twin framework. The full physics adjoint model of the Florida ...
Tribological Investigation of Multilayer Graphene Reinforced Alumina Ceramic Nanocomposites
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We investigated the wear resistance properties of high-frequency induction heat (HFIH) sintered alumina (Al2O3) ceramic nanocomposites containing various multilayer graphene (MLG) concentrations. The tribology of the ...
The GEOS-3 Retrospective Data Assimilation System: The 6-Hour Lag Case
Publisher: American Meteorological Society
Abstract: The fixed-lag Kalman smoother (FLKS) has been proposed as a framework to construct data assimilation procedures capable of producing high-quality climate research datasets. FLKS-based systems, referred to as retrospective ...
Variational Correction of Aircraft Temperature Bias in the NCEP’s GSI Analysis System
Publisher: American Meteorological Society
Abstract: arious studies have noted that aircraft temperature data have a generally warm bias relative to radiosonde data around 200 hPa. In this study, variational aircraft temperature bias correction is incorporated in the Gridpoint ...
Expansion of the All-Sky Radiance Assimilation to ATMS at NCEP
Publisher: American Meteorological Society
Abstract: AbstractSince the implementation of all-sky radiance assimilation of the Advanced Microwave Sounding Unit-A (AMSU-A) in the operational hybrid 4D ensemble?variational Global Forecast System at NCEP in 2016, the all-sky ...
Multiple Hydrometeors All-Sky Microwave Radiance Assimilation in FV3GFS
Publisher: American Meteorological Society
Abstract: Motivated by the use of the GFDL microphysics scheme in the Finite-Volume Cubed-Sphere Dynamical Core Global Forecast System (FV3GFS), the all-sky radiance assimilation framework has been expanded to include precipitating ...
Impact of Atmospheric River Reconnaissance Dropsonde Data on the Assimilation of Satellite Radiance Data in GFS
Publisher: American Meteorological Society
All-Sky Microwave Radiance Assimilation in NCEP’s GSI Analysis System
Publisher: American Meteorological Society
Abstract: he capability of all-sky microwave radiance assimilation in the Gridpoint Statistical Interpolation (GSI) analysis system has been developed at the National Centers for Environmental Prediction (NCEP). This development ...