Abstract: The cyclonic vorticity budget of the hemispheres is investigated using the output of the CCC GCM and objective analyses for the FGGE period. Analysis of GCM output gives direct estimates of the ?topographic? and ?frictional? ...

Abstract: The appropriateness of using simplified versions of the equations of motion to explain the response of the atmosphere to external forcing, such as that associated with the 1982/83 El Niño, is considered. In particular, the ...

Abstract: Global warming will result in changes in mean temperature and precipitation distributions and is also expected to affect interannual and longer time-scale internally generated variability as a consequence of changes in ...

Abstract: The scale-dependent behavior of atmospheric flow on the sphere is investigated in terms of the spectra and spectral budgets of enstrophy and kinetic and available potential energy. The decomposition into both the α = (n, ...

Abstract: Results from the European Centre for Medium-Range Weather Forecasts (ECMWF) high-resolution (T213L31) global analysis-forecast system are analysed as a function of scale. Three regimes of forecast skill are identified, ...

Abstract: Analyzed and forecast 200-mb velocity potential statistics from the ECMWF analysis-forecast cycle for the December?February and June?August seasons of the years 1986?91 are considered. The forecast skill of this representation ...

Abstract: Diagnostic studies of the general circulation are conducted, almost exclusively, using data and equations where pressure is the vertical coordinate. The complexity of the lower boundary condition in these isobaric coordinates ...

Abstract: A spectral analysis of error at 24, 48 and 72 hours in an operational forecast system is carded out for a winter and a summer month. The scale-dependent behavior of the error and the several factors governing error growth, ...

Abstract: Vertically integrated budgets of mass and energy for the global atmosphere, based on the ECMWF and GFDL FGGE III-b datasets for July 1979, have been obtained and compared with one another and with the results of a general ...

Abstract: The assumption that the streamfunction for two-dimensional nondivergent flow on the sphere is a homogeneous and isotropic random field is used to obtain a variety of results for the study of large-scale atmospheric turbulence. ...