Discussion
The variation in geostrophic winds with height, in particular, at the atmospheric boundary layer, considering the variation in pressure gradient as a function of height, is referred to as __________.
Answer: C
This is the Thermal wind.
The thermal wind is the vertical shear of the geostrophic wind: the difference between the geostrophic winds at two levels. It arises because horizontal temperature gradients make the pressure gradient change with height, and it blows parallel to the mean isotherms with cold air to the left in the Northern Hemisphere.
The isallobaric wind is the ageostrophic part driven by pressure changing with time. The gradient wind adds curvature (centripetal) effects to the geostrophic balance, and the cyclostrophic wind is the balance of pressure gradient and centripetal force alone, as in tornadoes. None of these describes a change with height.
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