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dc.contributor.authorSun, Wen-Yih  Concept link
dc.contributor.authorSun, Oliver M. T.  Concept link
dc.contributor.authorTsuboki, Kazuhisa  Concept link
dc.identifier.citationTellus A 64 (2012): 17516en_US
dc.description© The Author(s), 2012. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Tellus A 64 (2012): 17516, doi:10.3402/tellusa.v64i0.17516.en_US
dc.description.abstractIt is popular to use a horizontal explicit and a vertical implicit (HE-VI) scheme in the compressible nonhydrostatic (NH) model. However, when the aspect ratio becomes small, a small time-interval is required in HE-VI, because the Courant-Fredrich-Lewy (CFL) criterion is determined by the horizontal grid spacing. Furthermore, simulations from HE-VI can depart from the forward–backward (FB) scheme in NH even when the time interval is less than the CFL criterion allowed. Hence, a modified non-hydrostatic (MNH) model is proposed, in which the left-hand side of the continuity equation is multiplied by a parameter d (45d516, in this study). When the linearized MNH is solved by FB (can be other schemes), the eigenvalue shows that MNH can suppress the frequency of acoustic waves very effectively but does not have a significant impact on the gravity waves. Hence, MNH enables to use a longer time step than that allowed in the original NH. When the aspect ratio is small, MNH solved by FB can be more accurate and efficient than the NH solved by HE-VI. Therefore, MNH can be very useful to study cloud, Large Eddy Simulation (LES), turbulence, flow over complex terrains, etc., which require fine resolution in both horizontal and vertical directions.en_US
dc.publisherInternational Meteorological Instituteen_US
dc.rightsAttribution 4.0 International*
dc.subjectNon-hydrostatic modelen_US
dc.subjectAspect ratioen_US
dc.titleA modified atmospheric non-hydrostatic model on low aspect ratio gridsen_US

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Attribution 4.0 International
Except where otherwise noted, this item's license is described as Attribution 4.0 International