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RISA Variational Method for Analyzing Vortex Flows in Radar-Scanned Tornadic Mesocyclones. Part I: Formulations and Theoretical Considerations
Publisher: American Meteorological Society
The Existence and Stability of Steady Circulations in a Conditionally Symmetrically Unstable Basic Flow
Publisher: American Meteorological Society
Abstract: By treating the latent heating as an energy source which is implicitly related to the motion field, the existence of steady nonlinear circulations in a flow susceptible to Conditionally Symmetric Instability (CSI) is ...
Cold and Warm Frontal Circulations in an Idealized Moist Semigeostrophic Baroclinic Wave
Publisher: American Meteorological Society
Abstract: Diagnoses are presented of the three-dimensional vertical circulation for a coupled cold-warm frontal system in an idealized moist semi-geostrophic (SG) baroclinic wave. The vertical circulation is computed in SG space ...
A Theoretical Study of Cold Air Damming
Publisher: American Meteorological Society
Abstract: The dynamics of cold air damming are examined analytically with a two-layer steady state model. The upper layer is a warm and saturated cross-mountain (easterly or southeasterly onshore) flow. The lower layer is a cold ...
Generalized Adjoint for Physical Processes with Parameterized Discontinuities. Part I: Basic Issues and Heuristic Examples
Publisher: American Meteorological Society
Abstract: Symbolic operations are used together with delta functions to derive the generalized adjoint method for physical processes that contain first-order discontinuities caused by parameterized on/off switches with zero-order ...
Extended Sawyer–Eliassen Equation for Frontal Circulations in the Presence of small Viscous Moist Symmetric Stability
Publisher: American Meteorological Society
Abstract: The Sawyer?Eliassen (S?E) equation for frontal circulations forced by a geostrophic stretching deformation is extended to include the effects of both negative moist potential vorticity (MPV) and eddy viscosity. Since the ...
Semibalance Model—Connection between Geostrophic-Type and Balanced-Type Intermediate Models
Publisher: American Meteorological Society
Abstract: A hybrid intermediate model, called the semibalance model, is derived from a single truncation of the vector vorticity equation with a balanced vorticity approximation that neglects the advection and stretching?tilting of ...
Generalized Adjoint for Physical Processes with Parameterized Discontinuities. Part II: Vector Formulations and Matching Conditions
Publisher: American Meteorological Society
Abstract: Generalized tangent linear and adjoint equations are derived for a vector equation that contains a parameterized source term with discontinuous on/off switches controlled by a threshold condition. As an extension of Part ...
A.Formula for Eddy Viscosity in the Presence of Moist Symmetric Instability
Publisher: American Meteorological Society
Abstract: Liny's formula for eddy viscosity in the presence of purely convective instability is extended by including both the buoyancy and inertial contributions to the turbulence energy in a slantwise convection of moist symmetric ...
Ageostrophic Pseudovorticity and Geostrophic C-Vector Forcing—A New Look at the Q Vector in Three Dimensions
Publisher: American Meteorological Society
Abstract: By combining the two Q-vector component equations with the third quasigeostrophic (QG) diagnostic equation (the vertical ageostrophic vorticity equation) a complete set of QG diagnostic equations is formed in a three-dimensional ...