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DOI | 10.1175/JAS-D-17-0289.1 |
Interactions between Mesoscale and Submesoscale Gravity Waves and Their Efficient Representation in Mesoscale-Resolving Models | |
Wilhelm, Jannik1; Akylas, T. R.2; Boeloeni, Gergely1; Wei, Junhong1; Ribstein, Bruno3,4; Klein, Rupert5; Achatz, Ulrich1 | |
2018-07-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:7页码:2257-2280 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA; France |
英文摘要 | As present weather forecast codes and increasingly many atmospheric climate models resolve at least part of the mesoscale flow, and hence also internal gravity waves (GWs), it is natural to ask whether even in such configurations subgrid-scale GWs might impact the resolved flow and how their effect could be taken into account. This motivates a theoretical and numerical investigation of the interactions between unresolved submesoscale and resolved mesoscale GWs, using Boussinesq dynamics for simplicity. By scaling arguments, first a subset of submesoscale GWs that can indeed influence the dynamics of mesoscale GWs is identified. Therein, hydrostatic GWs with wavelengths corresponding to the largest unresolved scales of present-day limited-area weather forecast models are an interesting example. A large-amplitude WKB theory, allowing for a mesoscale unbalanced flow, is then formulated, based on multiscale asymptotic analysis utilizing a proper scale-separation parameter. Purely vertical propagation of submesoscale GWs is found to be most important, implying inter alia that the resolved flow is only affected by the vertical flux convergence of submesoscale horizontal momentum at leading order. In turn, submesoscale GWs are refracted by mesoscale vertical wind shear while conserving their wave-action density. An efficient numerical implementation of the theory uses a phase-space ray tracer, thus handling the frequent appearance of caustics. The WKB approach and its numerical implementation are validated successfully against submesoscale-resolving simulations of the resonant radiation of mesoscale inertia GWs by a horizontally as well as vertically confined submesoscale GW packet. |
英文关键词 | Dynamics Gravity waves Internal waves Subgrid-scale processes Resonance Parameterization |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435538400001 |
WOS关键词 | PSEUDO-INCOMPRESSIBLE EQUATIONS ; WEATHER PREDICTION MODELS ; KINETIC-ENERGY SPECTRA ; GENERAL-CIRCULATION ; DRAG PARAMETRIZATION ; MEAN MOTION ; PART II ; PARAMETERIZATION ; TURBULENCE ; CLIMATE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29715 |
专题 | 地球科学 |
作者单位 | 1.Goethe Univ Frankfurt, Inst Atmosphare & Umwelt, Frankfurt, Germany; 2.MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 3.Univ Paris Saclay, ENS Cachan, CNRS, Ctr Math & Leurs Applicat, Cachan, France; 4.CEA, DAM, DIF, Arpajon, France; 5.Free Univ Berlin, Inst Math, Berlin, Germany |
推荐引用方式 GB/T 7714 | Wilhelm, Jannik,Akylas, T. R.,Boeloeni, Gergely,et al. Interactions between Mesoscale and Submesoscale Gravity Waves and Their Efficient Representation in Mesoscale-Resolving Models[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(7):2257-2280. |
APA | Wilhelm, Jannik.,Akylas, T. R..,Boeloeni, Gergely.,Wei, Junhong.,Ribstein, Bruno.,...&Achatz, Ulrich.(2018).Interactions between Mesoscale and Submesoscale Gravity Waves and Their Efficient Representation in Mesoscale-Resolving Models.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(7),2257-2280. |
MLA | Wilhelm, Jannik,et al."Interactions between Mesoscale and Submesoscale Gravity Waves and Their Efficient Representation in Mesoscale-Resolving Models".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.7(2018):2257-2280. |
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