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Which quantity must be known besides the shear to obtain the absolute wind?

  • A.The stratification
  • B.The horizontal extent of the region over which the temperature gradient has been measured accurately
  • C.The wind at one reference level
  • D.The temperature at the surface, from which the wind at every level above may then be derived directly

Answer: C

The thermal wind gives only a difference, so an absolute wind profile requires a boundary value at some level, which in the atmosphere is usually the observed surface or upper level wind. This is the same difficulty the oceanographic dynamic method faces with its level of no motion. Surface temperature gives no wind information, and stratification and domain size do not enter the integration constant at all.

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