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Western boundary currents such as the Gulf Stream are

  • A.driven entirely by density differences
  • B.narrow, fast and warm
  • C.broad, slow and rather cool
  • D.confined entirely to the tropics

Answer: B

Correct answer: narrow, fast and warm

The Gulf Stream and the Kuroshio are a hundred kilometres wide and move at metres per second, against the thousand-kilometre width and centimetres per second of their eastern counterparts. The intensification arises because the Coriolis parameter varies with latitude, which crowds the return flow of each gyre against the western boundary - and it is why these currents dominate the poleward transport of heat.

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