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Minimal dynamical systems model of the Northern Hemisphere jet stream via embedding of climate data
Univ Paris Saclay, Lab Sci Climat & Environm, UMR CEA CNRS UVSQ 8212, IPSL, F-91191 Gif Sur Yvette, France;London Math Lab, 8 Margravine Gardens, London W6 8RH, England.ORCID iD: 0000-0001-5001-5698
London Math Lab, 8 Margravine Gardens, London W6 8RH, England;Hokkaido Univ, RIES Dept Math, Kita Ku, Kita 20 Nichi 10, Sapporo, Hokkaido 0010020, Japan.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden;Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm, Sweden.ORCID iD: 0000-0002-2032-5211
London Math Lab, 8 Margravine Gardens, London W6 8RH, England;Univ Reading, Dept Math & Stat, Reading RG6 6AX, Berks, England.
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2019 (English)In: Earth System Dynamics, ISSN 2190-4979, E-ISSN 2190-4987, Vol. 10, no 3, p. 555-567Article in journal (Refereed) Published
Abstract [en]

We derive a minimal dynamical systems model for the Northern Hemisphere midlatitude jet dynamics by embedding atmospheric data and by investigating its properties (bifurcation structure, stability, local dimensions) for different atmospheric flow regimes. The derivation is a three-step process: first, we obtain a 1-D description of the midlatitude jet stream by computing the position of the jet at each longitude using ERA-Interim. Next, we use the embedding procedure to derive a map of the local jet position dynamics. Finally, we introduce the coupling and stochastic effects deriving from both atmospheric turbulence and topographic disturbances to the jet. We then analyze the dynamical properties of the model in different regimes: one that gives the closest representation of the properties extracted from real data; one featuring a stronger jet (strong coupling); one featuring a weaker jet (weak coupling); and one with modified topography. Our model, notwithstanding its simplicity, provides an instructive description of the dynamical properties of the atmospheric jet.

Place, publisher, year, edition, pages
COPERNICUS GESELLSCHAFT MBH , 2019. Vol. 10, no 3, p. 555-567
National Category
Climate Research
Identifiers
URN: urn:nbn:se:uu:diva-395460DOI: 10.5194/esd-10-555-2019ISI: 000486705600001OAI: oai:DiVA.org:uu-395460DiVA, id: diva2:1366972
Funder
EU, European Research Council, 338965-A2C2Swedish Research Council, 2016-03724EU, Horizon 2020, A2C2 (338965)Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-10-31Bibliographically approved

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