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- W2113674554 abstract "The orographic gravity‐wave drag produced in flow over an axisymmetric mountain when both vertical wind shear and non‐hydrostatic effects are important was calculated using a semi‐analytical two‐layer linear model, including unidirectional or directional constant wind shear in a layer near the surface, above which the wind is constant. The drag behaviour is determined by partial wave reflection at the shear discontinuity, wave absorption at critical levels (both of which exist in hydrostatic flow) and total wave reflection at levels where the waves become evanescent (an intrinsically non‐hydrostatic effect), which produces resonant trapped lee‐wave modes. As a result of constructive or destructive wave interference, the drag oscillates with the thickness of the constant‐shear layer and the Richardson number within it ( Ri ), generally decreasing at low Ri and when the flow is strongly non‐hydrostatic. Critical‐level absorption, which increases with the angle spanned by the wind velocity in the constant‐shear layer, shields the surface from reflected waves, keeping the drag closer to its hydrostatic limit. Although, for the parameter range considered here, the drag seldom exceeds this limit, a substantial drag fraction may be produced by trapped lee waves, particularly when the flow is strongly non‐hydrostatic, the lower layer is thick and Ri is relatively high. In directionally sheared flows with , the drag may be misaligned with the surface wind in a direction opposite to the shear, a behaviour that is due totally to non‐trapped waves. The trapped lee‐wave drag, the reaction force of which is felt on the atmosphere at low levels, may therefore have a distinctly different direction from the drag associated with vertically propagating waves, which acts on the atmosphere at higher levels." @default.
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- W2113674554 date "2014-11-07" @default.
- W2113674554 modified "2023-09-23" @default.
- W2113674554 title "Impact of non‐hydrostatic effects and trapped lee waves on mountain‐wave drag in directionally sheared flow" @default.
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- W2113674554 doi "https://doi.org/10.1002/qj.2459" @default.
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