Validation and application of an ensemble Kalman filter in the Selat Pauh of Singapore
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OD_2009.pdf
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Author(s)
Wei, Jun
Rizzoli, Paola M
Date Issued
December 2009
Journal
Ocean Dynamics
Publisher
Springer
Citation
Wei, Jun, and Paola Malanotte-Rizzoli. “Validation and Application of an Ensemble Kalman Filter in the Selat Pauh of Singapore.” Ocean Dynamics 60.2 (2010) : 395-401-401. Copyright © 2009, Springer-Verlag
Version
Author's final manuscript
Abstract
The effectiveness of an ensemble Kalman filter (EnKF) is assessed in the Selat Pauh of Singapore using observing system simulation experiment. Perfect model experiments are first considered. The perfect model experiments examine the EnKF in reducing the initial perturbations with no further errors than those in the initial conditions. Current velocity at 15 observational sites from the true ocean is assimilated every hour into the false ocean. While EnKF reduces the initial velocity error during the first few hours, it fails after one tidal cycle (approximately 12 h) due to the rapid convergence of the ensemble members. Successively, errors are introduced in the surface wind forcing. A random perturbation ε [epsilon] is applied independently to each ensemble member to maintain the ensemble spread. The assimilation results showed that the success of EnKF depends critically on the presence of ε [epsilon], yet it is not sensitive to the magnitude of ε [epsilon], at least in the range of weak to moderate perturbations. Although all experiments were made with EnKF only, the results could be applicable in general to all other ensemble-based data assimilation methods.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1007/s10236-009-0253-y
