Abstract: In the present study foehn clearance is described and compared with strong downslope windstorms like the foehn and chinook. The comparison is based on surface and satellite data taken during foehn north of the Alps in ...

Abstract: Statistics of the global tropopause pressure are evaluated for the period between 1979 and 1993. The analysis is based on gridded data as provided by the ECMWF reanalysis project. The thermal and dynamical definitions of ...

Abstract: This study presents global statistics of tropopause parameters for a 15-yr period (1979?93). The parameters are height, temperature, potential temperature, mixing ratio of water vapor, and zonal, meridional and vertical ...

Abstract: Numerical solutions of a hydrostatic mesoscale model for stratified flow over topography are compared with analytical results and observational data. The numerical model was found to reproduce well phase and amplitude of ...

Abstract: The German Front Experiment, 1987 (GFE87) is a field experiment using aircraft, radar, surface, and upper-air observations to determine the influence of the European Alps on cold fronts. Measurements are concentrated in ...

Abstract: The atmosphere induces changes of the earth?s angular momentum via orographic and frictional torques and, in particular, via torques exerted by the equatorial bulge. While the torques leading to fluctuations of the axial ...

Abstract: In this note the impact of the vertical coordinate system on upper-tropospheric and lower-stratospheric structures is studied using the fifth-generation Pennsylvania State University?NCAR Mesoscale Model (MM5). Two different ...

Abstract: The polar and subpolar tropopause in both hemispheres is investigated using the ECMWF Reanalysis (ERA) data from 1979 to 1993 and radiosonde data from 1989 to 1993. Both the thermal and the dynamical criteria are applied ...

Abstract: The channeling effect of the Pyrenees on a cold front is illustrated using high resolution surface data. Satellite data support the analysis of the surface data and show that the surface front is trapped to a significant ...

Abstract: Given a flow domain D with subdomains D1 and D2, piecewise potential vorticity inversion (PPVI) inverts a potential vorticity (PV) anomaly in D2 and assumes vanishing PV in D1 where boundary conditions must be taken into ...