Quasi-Fixed Points and Periodic-Orbits in the Zebiak-Cane Enso Model with Applications in Kalman Filtering .1. Monthly Quasi-Fixed Points

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1995
Editor: 
Journal Title: 
Monthly Weather Review
Journal Date: 
Sep
Place Published: 
Tertiary Title: 
Volume: 
123
Issue: 
9
Pages: 
2802-2813
Section / Start page: 
Publisher: 
ISBN Number: 
0027-0644
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1995RR51300012
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Call Number: 
Abstract: 

In an effort to apply the interactive Kalman filter to higher-dimensional systems, the concept of a quasi-fixed point is introduced. This is defined to be a system state where the tendency, in a suitable reduced space, is at a minimum. It allows one to use conventional search algorithms for the detection of quasi-fixed points. In Part I quasi-fixed points of the ENSO model of Zebiak and Cane are found when run in a permanent monthly mode, the reduced space being defined via a multiple EOF projection. The stability characteristics of the quasi-fixed points are analyzed, and it is shown that they are significantly different from the (in)stabilities of the average monthly models. With these quasi-fixed points, assimilation experiments are carried out with the interactive Kalman filter for the Zebiak-Cane model in the reduced space. It is demonstrated that the results are superior to both a seasonal Kalman filter and the extended Kalman filter.

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Rr513Times Cited:1Cited References Count:16

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