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Which horizontal tilt characterises the decaying stage?

  • A.A tilt that spreads momentum away from the jet
  • B.A tilt that reverses direction every few hours as the disturbance oscillates about its equilibrium state
  • C.A tilt whose momentum flux converges into the jet
  • D.No horizontal tilt at all, the eddy remaining symmetric about its own axis throughout the whole life cycle

Answer: C

During barotropic decay the eddies tilt so that their momentum flux converges into the jet, accelerating it and drawing energy out of the eddy. This eddy driven jet maintenance is a central feature of the general circulation. A symmetric eddy transports no momentum, and the flux direction is systematic rather than oscillatory.

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