MOUNTAIN DRAG AND ADJUSTMENT TO EQUILIBRIUM: A NUMERICAL STUDY

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FARAHANI M.M.; WU R.

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Journal Paper

Paper Information

Journal: Journal of the Earth and Space Physics Year:2003 | Volume:29 | Issue:1 Page(s): 1-12

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Title

MOUNTAIN DRAG AND ADJUSTMENT TO EQUILIBRIUM: A NUMERICAL STUDY

Author(s)

FARAHANI M.M. | WU R. | Issue Writer Certificate

Keywords

ADJUSTMENT

FRONT

MOUNTAIN DRAG

ENERGETIC OF ADJUSTMENT PROCESS

Abstract

Series of experiments is carried out to investigate the influence of a mountain on air flows around and over it. Experiments were concentrated on the role of orography in the ADJUSTMENT process. Based on the results of experiments, we find that: (1) the final equilibrium state of the atmosphere is not geostropically balanced. The height of mountain influences the ADJUSTMENT period; higher mountains make the ADJUSTMENT period longer. (II) FRONTs are not observed during geostrophic ADJUSTMENT, unlike what was suggested before. Although FRONTal features appear on the maps, their length scales are shorter than those of the atmospheric FRONTs. (III) The ratios of kinetic energy to the potential energy released during ADJUSTMENT are smaller and larger than those predicted by the theory when, kinetic energy is computed from respectively geostrophic and actual winds. (IV) For small Froude numbers, the relation between MOUNTAIN DRAG and Froude number is more complicated than what has already been suggested. (V) In the nonlinear regime studied here, splitting of flow and vertically propagating internal gravity waves are found as other major mechanisms for drag development in addition to the three possibilities suggested by Smith for linear regimes.

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APA: Copy

FARAHANI, M.M., & WU, R.. (2003). MOUNTAIN DRAG AND ADJUSTMENT TO EQUILIBRIUM: A NUMERICAL STUDY. JOURNAL OF THE EARTH AND SPACE PHYSICS, 29(1), 1-12. SID. https://sid.ir/paper/545803/en

Vancouver: Copy

FARAHANI M.M., WU R.. MOUNTAIN DRAG AND ADJUSTMENT TO EQUILIBRIUM: A NUMERICAL STUDY. JOURNAL OF THE EARTH AND SPACE PHYSICS[Internet]. 2003;29(1):1-12. Available from: https://sid.ir/paper/545803/en

IEEE: Copy

M.M. FARAHANI, and R. WU, “MOUNTAIN DRAG AND ADJUSTMENT TO EQUILIBRIUM: A NUMERICAL STUDY,” JOURNAL OF THE EARTH AND SPACE PHYSICS, vol. 29, no. 1, pp. 1–12, 2003, [Online]. Available: https://sid.ir/paper/545803/en

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