期刊
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
卷 14, 期 8, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022MS003036
关键词
data assimilation; hybrid; ensemble Kalman filter
资金
- NOAA Physical Sciences Laboratory
- NOAA Unified Forecast System Research to Operation (UFS-R2O) Project - NOAA's Office of Science and Technology Integration (OSTI) of National Weather Service (NWS)
- Weather Program Office (WPO) of the Office of Oceanic and Atmospheric Research (OAR)
- Office of Naval Research (ONR) [N00014-19-1-2522, N00014-20-1-2580]
- NOAA [NA20OAR4600277]
This study compares two methods for incorporating a time-invariant, high-rank covariance estimate in an ensemble-based data assimilation system: the hybrid-covariance approach and the hybrid-gain approach. The results show that the simpler and less expensive hybrid-gain approach can achieve similar performance if the incremental normal-mode balance constraint applied to the ensemble-part of the hybrid-covariance update is turned off.
Two methods for incorporating a time-invariant, high-rank covariance estimate in an ensemble-based data assimilation system for global weather prediction are compared. The hybrid-covariance approach linearly combines the static and ensemble-based covariance estimate in a four-dimensional variational solver, whereas the hybrid-gain approach blends analysis increments computed separately using a three-dimensional variational solution and an ensemble Kalman filter solution. Results show that the simpler and less expensive hybrid-gain approach performs similarly if the incremental normal-mode balance constraint applied to the ensemble-part of the hybrid-covariance update is turned off.
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