A parametrization scheme accounting for non-hydrostatic effects on the momentum flux of vertically-propagating orographic gravity waves: formulae and preliminary tests in the Model for Prediction Across Scales (MPAS)

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Xu, X., Zhang, R., Teixeira, M. A. C. ORCID: https://orcid.org/0000-0003-1205-3233, van Niekerk, A., Xue, M., Lu, Y., Xue, H., Li, R. and Wang, Y. (2024) A parametrization scheme accounting for non-hydrostatic effects on the momentum flux of vertically-propagating orographic gravity waves: formulae and preliminary tests in the Model for Prediction Across Scales (MPAS). Journal of the Atmospheric Sciences, 81 (5). pp. 805-817. ISSN 1520-0469 doi: 10.1175/JAS-D-23-0020.1

Abstract/Summary

The momentum transport by orographic gravity waves (OGWs) plays an important role in driving the large-scale circulation throughout the atmosphere and is subject to parameterization in numerical models. Current parameterization schemes, which were originally developed for coarse-resolution models, commonly assume that unresolved OGWs are hydrostatic. With the increase in the horizontal resolution of state-of-the-art numerical models, unresolved OGWs are of smaller horizontal scale and more influenced by nonhydrostatic effects (NHE), thus challenging use of the hydrostatic assumption. Based on the analytical formulae for nonhydrostatic OGWs derived in our recent study, the orographic gravity wave drag (OGWD) parameterization scheme in the Model for Prediction Across Scales is revised by accounting for NHE. Global simulations with 30-km horizontal resolution are conducted to investigate NHE on the momentum transport of OGWs and their impacts on the large-scale circulation in boreal winter. NHE are evident in regions of complex terrain such as the Tibetan Plateau, Rocky Mountains, Southern Andes and Eastern Antarctica. The parameterized surface wave momentum flux can be either reduced or enhanced depending on the relative importance of NHE and model physics-dynamics interactions. The NHE corrections to the OGWD scheme significantly reduce the easterly biases in the polar stratosphere of the Northern Hemisphere, due to both weakened OGWD in the upper troposphere and lower stratosphere and suppressed upward propagation of resolved waves into the stratosphere. However, the revised OGWD scheme only has a weak influence on the large-scale circulation in the Southern Hemisphere during boreal winter.

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Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/115552
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Uncontrolled Keywords	Orographic gravity waves, gravity wave drag, flow over mountains, linear wave theory, orographic drag parametrization, non-hydrostatic effects, vertical wave propagation, MPAS meteorological model
Publisher	American Meteorological Society
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Date Deposited:	05 Mar 2024 10:15	Date item deposited into CentAUR
Last Modified:	25 Jan 2025 00:19	Date item last modified

References

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