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Stationary Wave Accumulation and the Generation of Low-Frequency Variability on Zonally Varying Flows
Publisher: American Meteorological Society
Abstract: A potent mechanism for the generation of low-frequency atmospheric variability on vortex basic states consisting of a single potential vorticity jump, or contour, separating two regions of uniform equivalent barotropic ...
Oscillatory Instabilities to Zonally Varying Barotropic Flows
Publisher: American Meteorological Society
Abstract: The barotropic instability of a forced, axisymmetric vortex patch is examined and linked to prior work on the destabilization of a single Rossby wave via triad interactions. Both oscillatory instabilities, which share ...
Upper-Tropospheric Potential Vorticity Fluctuations and the Dynamical Relevance of the Time Mean
Publisher: American Meteorological Society
Abstract: Analysis of frequency distribution functions of potential vorticity (PV) on middleworld isentropic surfaces that intersect the tropopause reveals that dynamics on these surfaces are dominated by the tropopause separating ...
Potential Vorticity Homogenization and Stationary Waves
Publisher: American Meteorological Society
Abstract: The general character of stationary Rossby waves in a state with homogenized tropospheric PY as opposed to more conventionally assumed PV distributions is discussed. It is shown that the expected changes in wave pattern ...
Observational Error Structures and the Value of Advanced Assimilation Techniques
Publisher: American Meteorological Society
Abstract: The ability of four-dimensional variational (4DVAR) assimilation of data to reduce various observational error structures in a quasigeostrophic model is studied. It is found that 4DVAR with assimilation periods on the order ...