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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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NPG | Articles | Volume 25, issue 3
Nonlin. Processes Geophys., 25, 713–729, 2018
https://doi.org/10.5194/npg-25-713-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Numerical modeling, predictability and data assimilation in...

Nonlin. Processes Geophys., 25, 713–729, 2018
https://doi.org/10.5194/npg-25-713-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 19 Sep 2018

Research article | 19 Sep 2018

Nonlinear effects in 4D-Var

Massimo Bonavita et al.

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AR by Anna Wenzel on behalf of the Authors (03 Aug 2018)  Author's response
ED: Publish subject to minor revisions (review by editor) (08 Aug 2018) by Michael Ghil
AR by Lorena Grabowski on behalf of the Authors (20 Aug 2018)  Author's response
ED: Publish as is (21 Aug 2018) by Michael Ghil
Publications Copernicus
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Short summary
This paper deals with the effects of nonlinearity in a state-of-the-art atmospheric global data assimilation system. It is shown that these effects have become increasingly important over the years due to increased model resolution and use of nonlinear observations. The ability to deal with nonlinearities has thus become a crucial asset of data assimilation algorithms. At ECMWF this is done in a perturbative fashion. Advantages and limitations of this technique are discussed.
This paper deals with the effects of nonlinearity in a state-of-the-art atmospheric global data...
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