Four-dimensional ensemble Kalman filtering

B. R. Hunt, E. Kalnay, Eric Kostelich, E. Ott, D. J. Patil, T. Sauer, I. Szunyogh, J. A. Yorke, A. V. Zimin

Research output: Contribution to journalArticlepeer-review

189 Scopus citations


Ensemble Kalman filtering was developed as a way to assimilate observed data to track the current state in a computational model. In this paper we show that the ensemble approach makes possible an additional benefit: the timing of observations, whether they occur at the assimilation time or at some earlier or later time, can be effectively accounted for at low computational expense. In the case of linear dynamics, the technique is equivalent to instantaneously assimilating data as they are measured. The results of numerical tests of the technique on a simple model problem are shown.

Original languageEnglish (US)
Pages (from-to)273-277
Number of pages5
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Issue number4
StatePublished - Aug 2004

ASJC Scopus subject areas

  • Oceanography
  • Atmospheric Science


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