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CSV
RISA Potential Vorticity and Wave Activity Diagnosis of Optimal Perturbation Evolution
Publisher: American Meteorological Society
Abstract: A diagnosis of singular vector (SV) evolution (computed for the L2 streamfunction norm) in the Eady model using potential vorticity (PV) and Eliassen?Palm (E?P) flux diagnostics is performed. In addition, a partitioning ...
Using Piecewise Potential Vorticity Inversion to Diagnose Frontogenesis. Part I: A Partitioning of the Q Vector Applied to Diagnosing Surface Frontogenesis and Vertical Motion
Publisher: American Meteorological Society
Abstract: The technique of piecewise potential vorticity (PV) inversion is used to identify the nondivergent wind fields attributed to upper-, middle-, and lower-tropospheric PV anomalies in addition to the irrotational wind with ...
On the Dynamics of Adjustment in the f-Plane Shallow Water Adjoint System
Publisher: American Meteorological Society
Abstract: AbstractAnalytic results and numerical experimentation reveal that a ?backward? integration of the adjoint of the shallow water system linearized about a basic state at rest on an f plane is characterized by a radiation ...
Validation of a Tropical Cyclone Steering Response Function with a Barotropic Adjoint Model
Publisher: American Meteorological Society
Abstract: The steering of a tropical cyclone (TC) vortex is commonly understood as the advection of the TC vortex by an ?environmental wind.? In past studies, the environmental steering wind vector has been defined by the horizontal ...
Diagnosis of Optimal Perturbation Evolution in the Eady Model
Publisher: American Meteorological Society
Abstract: The structure and evolution of Eady model singular vector (SV, also referred to as optimal perturbation) streamfunction perturbations are described using a combination of two different partitions of the vector subspace ...
Using Tropopause Maps to Diagnose Midlatitude Weather Systems
Publisher: American Meteorological Society
Abstract: The use of potential vorticity (PV) allows the efficient description of the dynamics of nearly balanced atmospheric flow phenomena, but the distribution of PV must be simply represented for ease in interpretation. ...
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 ...
Dynamical Sensitivity Analysis of Tropical Cyclone Steering Using an Adjoint Model
Publisher: American Meteorological Society
Abstract: hrough the use of an adjoint model, the sensitivity of the steering of a simulated tropical cyclone (TC) to various aspects of a model forecast trajectory can be calculated. This calculation, providing a priori information ...