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RISA Stratosphere-Troposphere Data Assimilation System
Publisher: American Meteorological Society
Abstract: A data assimilation system has been developed at the UK Meteorological Office to analyze the mix of observations available in the troposphere and stratosphere. The data assimilation system is based on the analysis correction ...
On the Sensitivity of Annular Mode Dynamics to Stratospheric Radiative Time Scales
Publisher: American Meteorological Society
Abstract: Long decorrelation time scales of the annular mode are observed in the lower stratosphere. This study uses a simple dynamical model, which has been used extensively to study stratosphere?troposphere coupling to investigate ...
Isentropic Mass Exchange between the Tropics and Extratropics in the Stratosphere
Publisher: American Meteorological Society
Abstract: The isentropic mass exchange between the Tropics and extratropics in the stratosphere is investigated with a semi-Lagrangian transport model for the periods from 1 June to 31 October 1992 and from 1 December 1992 to 30 ...
Planetary-Scale Disturbances in the Southern Stratosphere during Early Winter
Publisher: American Meteorological Society
Abstract: The early winter (mid-April to mid-July) circulation in the Southern Hemisphere stratosphere is studied. Emphasis is placed on the evolution of strong disturbances with structures dominated by the zonal wavenumber-1 component ...
High-Resolution Stratospheric Tracer Fields Estimated from Satellite Observations Using Lagrangian Trajectory Calculations
Publisher: American Meteorological Society
Abstract: A technique is introduced by which high-resolution tracer fields may be constructed from low-resolution satellite observations. The technique relies upon the continual cascade of tracer variance from large to small scales ...
The Splitting of the Stratospheric Polar Vortex in the Southern Hemisphere, September 2002: Dynamical Evolution
Publisher: American Meteorological Society
Abstract: The polar vortex of the Southern Hemisphere (SH) split dramatically during September 2002. The large-scale dynamical effects were manifest throughout the stratosphere and upper troposphere, corresponding to two distinct ...
Global QBO Circulation Derived from UKMO Stratospheric Analyses
Publisher: American Meteorological Society
Abstract: Global circulation anomalies associated with the stratospheric quasi-biennial oscillation (QBO) are analyzed based on U.K. Meteorological Office (UKMO) assimilated wind and temperature fields. Zonal winds and temperatures ...
Evolution of the Stratosphere during Northern Winter 1991/92 as Diagnosed from U.K. Meteorological Office Analyses
Publisher: American Meteorological Society
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 ...
Mixing Processes within the Polar Night Jet
Publisher: American Meteorological Society
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 ...
Spring Dehydration in the Antarctic Stratospheric Vortex Observed by HALOE
Publisher: American Meteorological Society
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. ...