Weak interaction between zonal jets on a β plane

Kiori Obuse, Shin Ichi Takehiro, Michio Yamada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We investigate the weak interaction between two zonal jets superposed upon a small-scale sinusoidal transversal flow on a β plane. Using analytical steady solutions of isolated zonal jets (Obuse et al. in Phys D 240:1825-1834, 2011) of weakly nonlinear model, introduced by Manfroi and Young (J Atmos Sci 56:784-800, 1999), we estimate the time derivative of the distance between two identical zonal jets by a perturbation method. It is confirmed that two identical zonal jets placed apart attract each other, and the attraction becomes stronger as the distance between them gets shorter. The result is in agreement with the numerically obtained behaviour of two zonal jets. This is also consistent with gradual mergers and disappearances of zonal jets seen in forced two-dimensional barotropic incompressible flows on a rotating sphere and on a β plane.

Original languageEnglish
Pages (from-to)111-127
Number of pages17
JournalJapan Journal of Industrial and Applied Mathematics
Issue number1
Publication statusPublished - Feb 2013
Externally publishedYes


  • Barotropic flow
  • Cahn-Hilliard equation
  • Jets' interaction
  • Rotating fluid
  • Turbulence
  • Zonal jet

ASJC Scopus subject areas

  • Engineering(all)
  • Applied Mathematics


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