A data-Driven method for improving the correlation estimation in serial ensemble kalman filters

Michèle De La Chevrotière, JOHN Harlim

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A data-driven method for improving the correlation estimation in serial ensemble Kalman filters is introduced. The method finds a linear map that transforms, at each assimilation cycle, the poorly estimated sample correlation into an improved correlation. This map is obtained from an offline training procedure without any tuning as the solution of a linear regression problem that uses appropriate sample correlation statistics obtained from historical data assimilation outputs. In an idealized OSSE with the Lorenz-96 model and for a range of linear and nonlinear observation models, the proposed scheme improves the filter estimates, especially when the ensemble size is small relative to the dimension of the state space.

Original languageEnglish (US)
Pages (from-to)985-1001
Number of pages17
JournalMonthly Weather Review
Volume145
Issue number3
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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