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Which diagram is used to track that oscillation operationally?

  • A.A tephigram
  • B.A Hovmoller diagram of the surface pressure anomaly along the equator over the preceding several months
  • C.A phase space diagram of two principal components
  • D.A wavenumber-frequency spectrum computed over the preceding ninety days of outgoing longwave radiation data

Answer: C

The Wheeler and Hendon diagram plots the two leading principal components of combined circulation and convection fields, so the state appears as a point moving anticlockwise through eight numbered phases. Amplitude and phase together summarise the oscillation compactly. Hovmoller diagrams are also used to display the propagation but the phase space plot is the standard operational index.

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