Search Results
You are looking at 1 - 6 of 6 items for :
- Author or Editor: Norman A. Phillips x
- Bulletin of the American Meteorological Society x
- All content x
TIROS-N data for 21 October 1979 indicate a stronger jet and cyclone vortex at 250 mb in the eastern Pacific than is suggested by forecast continuity and aircraft winds. NOAA-6 data for 29 January 1980 illustrates the problem of microwave temperature retrievals that are too low when precipitation is present. A preliminary test for the latter is outlined and recommended for users of the GWE Level lib satellite data.
TIROS-N data for 21 October 1979 indicate a stronger jet and cyclone vortex at 250 mb in the eastern Pacific than is suggested by forecast continuity and aircraft winds. NOAA-6 data for 29 January 1980 illustrates the problem of microwave temperature retrievals that are too low when precipitation is present. A preliminary test for the latter is outlined and recommended for users of the GWE Level lib satellite data.
A linear dynamical prediction model is combined with a linear analysis scheme to give a formula for the expected squared forecast error, as a function of space and time, given a knowledge of observational error covariance and spectrum of the true field. The formula is applied with a two-layer geostrophic model to estimate the maximum impact of tropospheric temperatures derived from satellite radiances over oceanic areas on the accuracy of 500 mb forecasts over North America. The results show a positive impact if the observations are analyzed by an unrealistically efficient optimum interpolation method, but they show a negative impact at all but the smallest satellite error values if the observations are analyzed by a method that ignores observational errors. Eight conclusions are reached concerning routine numerical forecasts and the First GARP Global Experiment.
A linear dynamical prediction model is combined with a linear analysis scheme to give a formula for the expected squared forecast error, as a function of space and time, given a knowledge of observational error covariance and spectrum of the true field. The formula is applied with a two-layer geostrophic model to estimate the maximum impact of tropospheric temperatures derived from satellite radiances over oceanic areas on the accuracy of 500 mb forecasts over North America. The results show a positive impact if the observations are analyzed by an unrealistically efficient optimum interpolation method, but they show a negative impact at all but the smallest satellite error values if the observations are analyzed by a method that ignores observational errors. Eight conclusions are reached concerning routine numerical forecasts and the First GARP Global Experiment.
Inertia circle motion is a familiar concept demonstrating the behavior of a horizontally moving particle on the rotating earth in response to the Coriolis force. Three dynamical principles valid in nonrotating space are used to explain the principal properties of this motion without the need for solving differential equations. The motion is an oscillation about a central latitude selected by the particle's angular momentum, in which the restoring force is set by the relative magnitudes of the poleward attraction of gravity and the equatorward attraction of the centrifugal force as the particle oscillates about the central latitude.
Inertia circle motion is a familiar concept demonstrating the behavior of a horizontally moving particle on the rotating earth in response to the Coriolis force. Three dynamical principles valid in nonrotating space are used to explain the principal properties of this motion without the need for solving differential equations. The motion is an oscillation about a central latitude selected by the particle's angular momentum, in which the restoring force is set by the relative magnitudes of the poleward attraction of gravity and the equatorward attraction of the centrifugal force as the particle oscillates about the central latitude.
The many activities of Carl-Gustaf Rossby are described, beginning with his early adventures at sea, and presented in the context of the meteorological world of his time. His scientific ideas and papers are not discussed except for an important aspect of his typical approach to analysis of atmospheric and oceanic motion. His success in fostering interaction between different people and institutions is emphasized.
The many activities of Carl-Gustaf Rossby are described, beginning with his early adventures at sea, and presented in the context of the meteorological world of his time. His scientific ideas and papers are not discussed except for an important aspect of his typical approach to analysis of atmospheric and oceanic motion. His success in fostering interaction between different people and institutions is emphasized.
