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Ship tracks visible in satellite imagery of marine stratocumulus are caused by

  • A.exhaust particles acting as additional condensation nuclei
  • B.heat released by the ships warming the cloud layer
  • C.water vapour emitted directly by the ships
  • D.the physical disturbance of the sea surface by the hull

Answer: A

The added nuclei produce more and smaller droplets along the track, brightening the cloud in a narrow line. They are among the clearest natural demonstrations of the first indirect effect available. The tracks persist for hours and can be traced for hundreds of kilometres.

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