Abstract: The present study describes the analysis of a sudden warming which developed spontaneously during one winter of a 33-month simulation using a three-dimensional, spectral, quasi-geostrophic model. The changes that occurred ...

Abstract: An investigation has been conducted of the steady response to orography as described by the linearized shallow-water equations on the sphere. Results have been obtained for both idealized and realistic climatological mean ...

Abstract: Meteorological analyses, produced at the U.K. Meteorological Office by data assimilation, are used to study the circulation of the stratosphere in the Northern Hemisphere during winter 1991/92. The analyses are supplemented ...

Abstract: Lagrangian material line simulations are performed using U.K. Meteorological Office assimilated winds and temperatures to examine mixing processes in the middle- and lower-stratospheric polar night jet during the 1992 ...

Abstract: The distribution of dehydrated air in the middle and lower stratosphere during the 1992 Southern Hemisphere spring is investigated using Halogen Occultation Experiment (HALOE) observations and trajectory techniques. ...