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| Home > Publications database > Modeling orographic gravity waves from source to termination to improve parameterization schemes in climate models |
| Home > Publications database > Modeling orographic gravity waves from source to termination to improve parameterization schemes in climate models |
| Book/Dissertation / PhD Thesis | FZJ-2024-02560 |
2024
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-750-9
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Please use a persistent id in citations: doi:10.34734/FZJ-2024-02560
Abstract: Gravity waves (GWs) are one of the most important drivers of middle atmospheric circulations and strongly affect the polar vortex of the winter hemisphere. These waves are of comparatively small horizontal scales and are generated by a multitude of processes, of which wind flow over orography and convection are the most common. The resolution of today’s climate models is, however, too coarse for resolving GWs explicitly; therefore, they need to be parameterized within long-term climate projections. These parameterizations are a first approximation of the GW’s effect on the atmosphere. A technical shortcoming common to parameterization schemes is their vertical column-wise application without the possibility of horizontal communication between adjacent grid cells due to computation-cost intensity. Hence, parametrization schemes do not account for the horizontal propagation of GWs, even though many studies show the far propagation of gravity waves (and especially mountain waves, MWs) from their sources. This horizontal propagation transports the momentum carried by the orographic GWs away from regions of high orographic variability; thereby spreading the effect of the orography on the atmosphere dynamics. Studies attribute highvariability and model biases in the southern hemisphere to this lack of horizontal propagation of mountain waves within climate models.
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