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Which quantity should be used when comparing parcel and environment for buoyancy?

  • A.Virtual temperature
  • B.Actual temperature, since it is what a thermometer measures and therefore what the observations provide
  • C.Potential temperature
  • D.Dew point temperature, which indicates how much water vapour the parcel is carrying with it as it rises

Answer: A

Buoyancy depends on density, and moist air is lighter than dry air at the same temperature, so the comparison must be made using virtual temperature. In the tropics the correction is comparable with the temperature excess of a convective plume, so neglecting it can change the sign of the buoyancy. Potential temperature is the right variable for comparing parcels at different levels but not for evaluating buoyancy at one level.

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