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Discussion papers
https://doi.org/10.5194/acp-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Feb 2020

Submitted as: research article | 03 Feb 2020

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This preprint is currently under review for the journal ACP.

Sensitivities of the MJO Forecasts on Configurations of Physics in the ECMWF Global Model

Jun-Ichi Yano1 and Nils P. Wedi2 Jun-Ichi Yano and Nils P. Wedi
  • 1CNRM, Météo-France and CNRS, UMR 3589, 31057 Toulouse Cedex, France
  • 2European Center for Medium-Range Weather Forecast, Reading, UK

Abstract. Sensitivities of MJO forecasts to various different configurations of physics are examined with the ECMWF global model, IFS. A motivation behind this study is to explore a possibility of interpreting the MJO as a nonlinear free wave under active interactions with Rossby waves from and to higher latitudes. With this motivation in mind, various momentum dissipation terms as well as diabatic heating are selectively turned off over the tropics for the range of the latitudes 20° S–20° N, and it is examined how physical tendencies control the MJO dynamics. The former include eddy diffusivities as well as dissipations by both shallow and deep convection. The reduction of momentum dissipations tends to improve the MJO forecasts, but the effects are hardly additive, and their total removals rather lead to a rapid decay of the MJO, illustrating the complexity of interactions between the physics.

Jun-Ichi Yano and Nils P. Wedi

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Status: open (until 30 Mar 2020)
Status: open (until 30 Mar 2020)
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Jun-Ichi Yano and Nils P. Wedi

Jun-Ichi Yano and Nils P. Wedi

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