Application of the Ensemble Kalman Filter and Smoother to a Coupled Atmosphere-ocean Model

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Author(s)

    • Ueno Genta
    • The Institute of Statistical Mathematics, ROIS/Japan Science and Technology Agancy
    • Higuchi Tomoyuki
    • The Institute of Statistical Mathematics, ROIS/Japan Science and Technology Agancy
    • Hirose Naoki
    • Research Institute for Applied Mechanics, Kyushu University

Abstract

We report an application of the ensemble Kalman filter (EnKF) and smoother (EnKS) to an intermediate coupled atmosphere-ocean model of Zebiak and Cane, into which the sea surface height (SSH) anomaly observations by TOPEX/POSEIDON (T/P) altimetry are assimilated. Smoothed estimates of the 54,403 dimensional state are obtained from 1,981 observational points with 2,048 ensemble members. While assimilated data are SSH anomalies alone, the estimated sea surface temperature (SST) anomalies reproduce primary temporal characteristics of the actual SST. The smoothed estimate of the zonal wind anomalies is also consistent with the observation except for the westerly anomalies in the western Pacific.

Journal

  • SOLA

    SOLA (3), 5-8, 2007

    Meteorological Society of Japan

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