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Which seasonal movement does the convergence zone undergo?

  • A.It moves poleward in winter
  • B.It moves eastward around the globe with a period of about forty to fifty days in each hemisphere
  • C.It follows the sun with a lag of a month or two
  • D.It remains fixed at the equator throughout the year because that is where the heating is greatest

Answer: C

The zone migrates into the summer hemisphere, reaching well north of the equator over land in July and south in January, with a lag reflecting the thermal inertia of the surface. Its movement over land is much larger than over ocean because the sea responds slowly. The forty to fifty day eastward propagation describes the Madden-Julian Oscillation, which is a separate intraseasonal phenomenon. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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