Ensemble-variational integrated localized data assimilation

Hybrid variational ensemble data assimilation (hybrid DA) is widely used in research and operational systems, and it is considered the current state of the art for the initialization of numerical weather prediction models. However, hybrid DA requires a separate ensemble DA to estimate the uncertainty in the deterministic variational DA, which can be suboptimal both technically and scientifically. A new framework called the ensemble variational integrated localized (EVIL) data assimilation addresses this inconvenience by updating the ensemble analyses using information from the variational deterministic system. The goal of EVIL is to encompass and generalize existing ensemble Kalman filter methods in a variational framework. Particular attention is devoted to the affordability and efficiency of the algorithm in preparation for operational applications.

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Author Auligné, Thomas
Ménétrier, Benjamin
Lorenc, Andrew C.
Buehner, Mark
Publisher UCAR/NCAR - Library
Publication Date 2016-10-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:25:55.258596
Metadata Record Identifier edu.ucar.opensky::articles:18943
Metadata Language eng; USA
Suggested Citation Auligné, Thomas, Ménétrier, Benjamin, Lorenc, Andrew C., Buehner, Mark. (2016). Ensemble-variational integrated localized data assimilation. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7m90bcw. Accessed 03 April 2025.

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