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Which chart displays the pressure on an isentropic surface?

  • A.A thickness chart
  • B.A cross section, which displays the vertical structure of the atmosphere along a chosen line through the domain
  • C.An isentropic analysis
  • D.A constant pressure chart, on which the geopotential height of a chosen pressure surface is contoured instead

Answer: C

An isentropic chart contours the pressure or the Montgomery streamfunction on a surface of constant potential temperature, and the flow across the pressure contours shows the vertical motion directly. Constant pressure charts contour height on a pressure surface, which is the complementary construction. Both display the same three dimensional field from different slices. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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