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The material rate of change of pressure following a parcel is denoted by _____.

  • A.w, which is the symbol conventionally used for the vertical velocity in height coordinates instead
  • B.psi
  • C.chi, which is the velocity potential from which the divergent part of the horizontal wind is derived
  • D.omega

Answer: D

Omega is the vertical velocity in pressure coordinates and is negative for ascent because pressure decreases with height. The symbol w denotes the geometric vertical velocity, psi is the streamfunction of the rotational wind, and chi is the velocity potential of the divergent wind. Keeping the four symbols distinct saves a great deal of confusion when reading the literature.

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