Abstract: Evidence is presented which illustrates the role of jet stream-frontal zone clear air turbulence (CAT) as a mechanism for the exchange of air and chemical trace constituents between the stratosphere and the troposphere. ...

Abstract: Results from three case study investigations of upper-level jet stream systems document the existence of stratospheric mesoscale cyclonic wind shear in the layer of maximum wind. Anomalously high values of potential vorticity ...

Abstract: Frontogenesis and geostrophically forced secondary circulations in the vicinity of jet stream-frontal zone systems are treated, assuming that the motions conform to the geostrophic momentum approximation and that the ...

Abstract: measurements from the Boulder Atmospheric Observatory meteorological research tower are used to describe the structure and physical processes of a strong surface cold front. Analysis reveals that the horizontal gradients ...

Abstract: No abstract available.

Abstract: Recent aircraft observations of the mesoscale and turbulent structure of upper level frontal zone-jet stream systems provide further evidence of stratosperic mesoscale cyclonic wind shear and associated anomalously high ...

Abstract: The distribution of wind, temperature, ozone, and turbulence within a multiple structured frontal zone-jet stream system is described using a combination of direct horizontal measurements by meteorologically-instrumented ...

Abstract: A numerical simulation using the inviscid adiabatic primitive equations for atmospheric motion framed in isentropic coordinates is shown to generate upper-level frontogenesis with physical and dynamical similarity to that ...

Abstract: The techniques of scale-analysis and case-study diagnosis are used to establish a theory of meteorological approximations for upper-level frontal zones. A scale-analysis of the governing equations reveals that. 1) the ...

Abstract: This article presents a review of upper-level fronts with the intent of synthesizing observational and modeling studies into a conceptual and dynamical description of these fronts and their evolution relative to the life ...