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Which conditions maximise the urban heat island?

  • A.Strong daytime sunshine, since the effect depends upon the absorption of solar radiation by the dark surfaces
  • B.Clear skies and light winds
  • C.Overcast skies with strong winds, which allow the stored heat to be released most rapidly into the air above
  • D.Heavy rainfall

Answer: B

The island arises because the countryside cools strongly while the city does not, and rural cooling requires clear calm conditions, so the difference is greatest then. Wind and cloud suppress the rural cooling and therefore the contrast. Daytime absorption contributes to the heat stored but the effect itself is a nocturnal phenomenon.

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