Original Research Papers
Short-range evolution of small perturbations in a barotropic model
Authors:
- Jean-François LacarraEmail Jean-François Lacarra
- Olivier Talagrand
Abstract
The short-range evolution of small initial errors is numerically investigated with an f-plane shallow-water model. It is shown that this evolution can be approximated by a linearized model for meteorologically realistic situations, and for ranges of up to about 48 hours. The results are consistent with a description of the slow manifold as an attracting set along which the dynamics of the flow is dominated by an instability process. As a consequence of the relatively large time scale for the meteorologically significant components of the flow, the linear model valid for short periods can befurther simplified to a constant coefficient model describing only the evolution of the large-scale components of the error. The possible implicationsof this result for the improvement of assimilation procedures are briefly discussed.
- Year: 1988
- Volume: 40 Issue: 2
- Page/Article: 81-95
- DOI: 10.3402/tellusa.v40i2.11784
- Published on 1 Jan 1988
- Peer Reviewed