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RISPhase Alignment of the Tropical Stratospheric QBO in the Annual Cycle
Publisher: American Meteorological Society
Abstract: This paper investigates the occurrence of phase alignment of the tropical stratospheric quasi-biennial oscillation (QBO) with the annual cycle. First, updating previous studies, observational results are shown for NCEP ...
Forced, Dissipative Generalizations of Finite-Amplitude Wave-Activity Conservation Relations for Zonal and Nonzonal Basic Flows
Publisher: American Meteorological Society
Abstract: The effects of forcing and dissipation are incorporated into finite amplitude, local wave-activity relations for disturbances to zonal and nonzonal flows. The method used is an extension of the momentum?Casimir and ...
The Vertical-Scale Cascade in Atmospheric Tracers due to Large-Scale Differential Advection
Publisher: American Meteorological Society
Abstract: Reduction in the vertical scale of atmospheric tracer fields occurs as a result of quasi-horizontal stirring by the large-scale flow, provided that the flow varies in the vertical. This scale reduction and the implications ...
Influence of the Equatorial QBO on the Extratropical Stratosphere
Publisher: American Meteorological Society
Abstract: The work described here examines the influence of the equatorial quasi-biennial oscillation (QBO) on the extratropics in a zonally truncated 3D mechanistic stratospheric model. Model results show that the extratropical ...
Wind Gyres in Circumpolar Oceans
Publisher: American Meteorological Society
Abstract: The interaction between a close wind-gyre and a neighboring eastward current is investigated using a hierarchy of increasingly complex analytical models. The method used to determine the vertical structure is that proposed ...
Wave Activity Diagnostics Applied to Baroclinic Wave Life Cycles
Publisher: American Meteorological Society
Abstract: Wave activity diagnostics are calculated for four different baroclinic wave life cycles, including the LC1 and LC2 cases studied by Thorncroft, Hoskins, and McIntyre. The wave activity is a measure of the disturbance ...
Zonally Symmetric Adjustment in the Presence of Artificial Relaxation
Publisher: American Meteorological Society
Abstract: umerical experiments, presented in a companion paper, have been performed in which the zonal-mean state of the stratosphere in a comprehensive, stratosphere-resolving, general circulation model is strongly relaxed (or ...
Reflection of Planetary Waves in Three-Dimensional Tropospheric Flows
Publisher: American Meteorological Society
Abstract: The authors consider quasi-stationary planetary waves that are excited by localized midlatitude orographic forcing in a three-dimensional primitive-equation model. The waves propagate toward subtropical regions where the ...
Constraints on the Mean Mass Transport across Potential Vorticity Contours
Publisher: American Meteorological Society
Abstract: An expression is derived for the quasi-horizontal part of the mass transport across a given potential vorticity contour on an isentropic surface, in terms of the rate of change of absolute circulation around the contour ...
The Response of the Lower Stratosphere to Zonally Symmetric Thermal and Mechanical Forcing
Publisher: American Meteorological Society
Abstract: he response of the atmosphere to zonally symmetric applied heating and mechanical forcing is considered, allowing for the fact that the response may include a change in the wave force (or ?wave drag?). A scaling argument ...