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Which climatic consequence does that stomatal response have?

  • A.Additional warming over vegetated land through reduced evaporative cooling
  • B.Additional cooling over vegetated land because the reduced transpiration allows more cloud to form above it
  • C.No consequence
  • D.A reduction in runoff, since less water is returned to the atmosphere and therefore less falls as rainfall

Answer: A

Reduced transpiration means less of the available energy is used for evaporation and more goes into sensible heat, warming the near surface air over vegetated land. Runoff increases rather than decreases, since more of the rainfall reaches the rivers. The effect is modest but is included in modern land surface schemes and contributes to the projected pattern of continental warming.

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