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The concentration of ice nucleating particles active at a given temperature generally

  • A.peaks near zero degrees Celsius
  • B.increases as the temperature falls
  • C.decreases as the temperature falls
  • D.stays constant at every temperature

Answer: B

More of the aerosol population becomes capable of nucleating as supercooling deepens. Empirical relations expressing this dependence are widely used in models, though they carry large uncertainties. Measurements of these particles vary widely between instruments.

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