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RISAdjoint Sensitivity and Finite-Time Normal Mode Disturbances during Blocking
Publisher: American Meteorological Society
Abstract: The finite-time normal mode instability of four-dimensional space?time basic states has been studied for cases of block development over the Gulf of Alaska, over the North Atlantic, and over southern Greenland using a ...
Singular Vectors, Finite-Time Normal Modes, and Error Growth during Blocking
Publisher: American Meteorological Society
Abstract: The evolution of finite-time singular vectors growing on four-dimensional space?time basic states is studied for cases of block development over the Gulf of Alaska and over the North Atlantic, using a two-level tangent ...
Genesis of Intraseasonal Oscillations and Equatorial Waves
Publisher: American Meteorological Society
Abstract: The particular role of evaporation?wind feedback, and as well cumulus convection and dissipation, in the formation of the Madden?Julian 30?60-day intraseasonal oscillation (MJO) and equatorially trapped waves, including ...
Subgrid-Scale Parameterizations of Eddy-Topographic Force, Eddy Viscosity, and Stochastic Backscatter for Flow over Topography
Publisher: American Meteorological Society
Abstract: General expressions for the eddy-topographic force, eddy viscosity, and stochastic backscatter, as well as a residual Jacobian term, are derived for barotopic flow over mean (single realization) topography. These subgrid-scale ...
Seasonal and Intraseasonal Variability of Large-Scale Barotropic Modes
Publisher: American Meteorological Society
Abstract: The barotropic instability of time-dependent observed basic states that are periodic, with a period of 1 yr covering the complete annual cycle, is analyzed using Floquet theory. The time-dependent basic state is constructed ...
Tropical–Extratropical Interactions of Intraseasonal Oscillations
Publisher: American Meteorological Society
Abstract: ropical?extratropical interactions of intraseasonal oscillations (ISOs), based on 30 years (1979?2009) of northern winter observations and theory, are compared. The phase relationships between the tropical signal of the ...
Seasonal Variability of Teleconnection Patterns
Publisher: American Meteorological Society
Abstract: The seasonal variability of 300-hPa global streamfunction fields taken from a 40-yr period of reanalyzed observations starting on 1 January 1958 and from long 497- and 900-yr general circulation model (GCM) datasets forced ...
Subgrid Parameterizations of the Eddy–Eddy, Eddy–Mean Field, Eddy–Topographic, Mean Field–Mean Field, and Mean Field–Topographic Interactions in Atmospheric Models
Publisher: American Meteorological Society
Abstract: Parameterizations are developed for each of the subgrid turbulence interaction classes in fully three-dimensional global atmospheric flows over topography, typical of January and July climate states. Stochastic and ...
A Theoretical Model of Australian Northwest Cloudband Disturbances and Southern Hemisphere Storm Tracks: The Role of SST Anomalies
Publisher: American Meteorological Society
Abstract: The author examine the effects of an enhanced sea surface temperature gradient, between the central Indian Ocean and the Indonesian archipelago, on the structure of the monthly averaged three-dimensional July global ...
Flow over Topography and Instability on Beta-Planes: The Effects of Different Expansion Representations
Publisher: American Meteorological Society
Abstract: We examine the linear instability properties of exact steady solutions for barotropic flow over topography in a beta-plane channel using models with different expansion representations and truncations. We compare our results ...