Abstract: A critical examination of the foundations of the slow manifold concept is presented. We study the behavior of the simple Lorenz truncated primitive equation model and show that free gravity modes exist for large forcing. ...

Abstract: The algorithm developed by Vautard and Legras is applied to a series of 37 winter of 700 mb geopotential height observations, in order to identify quasi-stationary patterns occurring over the extratropical North Atlantic ...

Abstract: The ability of four-dimensional variational (4DVAR) assimilation of data to reduce various observational error structures in a quasigeostrophic model is studied. It is found that 4DVAR with assimilation periods on the order ...

Abstract: The description of clouds in mesoscale models has progressed significantly during recent years by improving microphysical schemes with more physical parameterizations deduced from observations. Recently, the first lidar ...

Abstract: The ability of the fifth-generation Pennsylvania State University?NCAR Mesoscale Model (MM5) to simulate midlatitude ice clouds is evaluated. Model outputs are compared to long-term meteorological measurements by active ...