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Which relationship holds between the area and the strength of vertical motion?

  • A.Large areas support stronger vertical motion because more mass is available to be lifted at one time
  • B.There is no relationship
  • C.The strength depends on latitude rather than on the horizontal extent of the region of ascent involved
  • D.Small areas support much stronger vertical motion

Answer: D

Continuity requires that the same mass flux be achieved either by weak motion over a wide area or by strong motion over a narrow one, so a convective updraught a kilometre across can reach several metres per second while a synoptic system a thousand kilometres across manages only centimetres. The inverse relationship between area and intensity runs through the whole of atmospheric science. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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