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Which vertical structure does the divergent circulation above deep convection have?

  • A.Convergence at low levels and divergence near the tropopause
  • B.Divergence at low levels and convergence aloft, which is the pattern found over a subtropical high
  • C.Uniform divergence
  • D.Convergence through the whole depth of the troposphere as air is drawn towards the heated column

Answer: A

Deep convection draws air in near the surface and expels it near the tropopause, giving the familiar pattern of low level convergence and upper level divergence with a level of non-divergence in between. The upper outflow is what the velocity potential field displays. The reverse pattern occurs over regions of large-scale subsidence such as the eastern subtropical oceans.

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