Abstract: An integration of a general circulation model, with an ocean covered globe (or ?aqua planet?), exhibits disturbances that are similar to observed eastward propagating waves of period 30 to 60 days (which we refer to as the ...

Abstract: The impact of a parameterized spectrum of gravity waves on the simulation of the stratosphere in the Met Office Unified Model (UM) is investigated. In the extratropical mesosphere, the gravity wave forcing acts against the ...

Abstract: Trajectory calculations are used to examine ozone transport in the polar winter stratosphere during periods of the Upper Atmosphere Research Satellite (UARS) observations. The value of these calculations for determining ...

Abstract: Trajectory calculations using horizontal winds from the U.K. Meteorological Office data assimilation system and vertical velocities from a radiation calculation are used to simulate the three-dimensional motion of air ...

Abstract: The conditions that lead to the major warming over Antarctica in late September 2002 are examined. In many respects, the warming resembled wave-2 warmings seen in the Northern Hemisphere; the winter cyclonic circulation ...

Abstract: The transport of passive tracers observed by the Upper Atmosphere Research Satellite is simulated using computed three-dimensional trajectories of ≈ 100 000 air parcels initialized on a stratosphere grid, with horizontal ...

Abstract: The three-dimensional evolution of stratospheric water vapor distributions observed by the Microwave Limb Sounder (MLS) during the period October 1991?July 1992 is documented. The transport features inferred from the MLS ...

Abstract: Greenland has a major influence on the atmospheric circulation of the North Atlantic?western European region, dictating the location and strength of mesoscale weather systems around the coastal seas of Greenland and directly ...

Abstract: he Observing System Research and Predictability Experiment (THORPEX) was a 10-yr, international research program organized by the World Meteorological Organization?s World Weather Research Program. THORPEX was motivated ...

Abstract: To investigate the effects of the middle atmosphere on climate, the World Climate Research Programme is supporting the project "Stratospheric Processes and their Role in Climate" (SPARC). A central theme of SPARC, to examine ...