Articles | Volume 4, issue 1
Research article
12 Jan 2023
Research article |  | 12 Jan 2023

Robust poleward jet shifts in idealised baroclinic-wave life-cycle experiments with noisy initial conditions

Felix Jäger, Philip Rupp, and Thomas Birner

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Cited articles

Birner, T., Thompson, J. D., and Shepherd, T.: Up-gradient eddy fluxes of potential vorticity near the subtropical jet, Geophys. Res. Lett., 40, 5988–5993, 2013. a
Charney, J. G.: The dynamics of long waves in a baroclinic westerly current, J. Atmos. Sci., 4, 136–162, 1947. a
Eady, E. T.: Long waves and cyclone waves, Tellus, 1, 33–52, 1949. a
Farrell, B. F. and Ioannou, P.: Generalized stability theory. Part I: Autonomous operators, J. Atmos. Sci., 53, 2025–2040,<2025:GSTPIA>2.0.CO;2, 1996. a
Feldstein, S. B.: An observational study of the intraseasonal poleward propagation of zonal mean flow anomalies, J. Atmos. Sci., 55, 2516–2529, 1998. a, b
Short summary
Mid-latitude weather is dominated by the growth, breaking and decay of baroclinic waves and associated jet shifts. A way to study this process is via idealised life-cycle simulations, which are often classified as LC1 (anticyclonic breaking, poleward shift) or LC2 (cyclonic breaking, equatorward shift), depending on details of the initial state. We show that all systems exhibit predominantly anticyclonic character and poleward net shifts if multiple wave modes are allowed to grow simultaneously.