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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/esd-2020-8
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-2020-8
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Mar 2020

06 Mar 2020

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This preprint is currently under review for the journal ESD.

A Dynamical Systems Characterisation of Atmospheric Jet Regimes

Gabriele Messori1,2,, Nili Harnik3,, Erica Madonna4,5, Orli Lachmy6, and Davide Faranda7,8,9 Gabriele Messori et al.
  • 1Department of Earth Sciences, Uppsala University, Uppsala, Sweden
  • 2Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 3Department of Geosciences, Tel Aviv University, Tel Aviv, Israel
  • 4Geophysical Institute, University of Bergen, Bergen, Norway
  • 5Bjerknes Centre for Climate Research, Bergen, Norway
  • 6Department of Natural Sciences, Open University of Israel, Ra’anana, Israel
  • 7Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
  • 8London Mathematical Laboratory, London, U.K.
  • 9LMD/IPSL, Ecole Normale Superieure, PSL research University, Paris, France
  • These authors contributed equally to this work.

Abstract. Atmospheric jet streams are typically separated into primarily eddy-driven, or polar-front jets and primarily thermally-driven, or "subtropical" jets. Some regions also display merged jets, resulting from the (quasi) co-location of the regions of eddy generation with the subtropical jet. The different locations and driving mechanisms of these jets issue from very different underlying mechanisms, and result in very different jet characteristics. Here, we link our understanding of the dynamical jet maintenance mechanisms, mostly issuing from conceptual or idealised models, to the phenomena observed in reanalysis data. We specifically focus on developing a unitary analysis framework, grounded in dynamical systems theory, which may be applied to both idealised model and reanalysis data, and allow for direct intercomparison. Our results provide a proof-of-concept for using dynamical systems indicators to diagnose jet regimes in a versatile, conceptually intuitive and computationally efficient fashion.

Gabriele Messori et al.

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Gabriele Messori et al.

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Latest update: 29 Sep 2020
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Short summary
Atmospheric jets are a key component of the climate system and of our everyday lives. Indeed, they affect human ativities by influencing the weather in many mid-latitude regions. However, we still lack a complete understanding of their dynamical properties. In this study, we try to relate the understanding gained in idealised computer simulations of the jets to our knowledge from observations of the real atmosphere.
Atmospheric jets are a key component of the climate system and of our everyday lives. Indeed,...
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