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DOI | 10.1175/JAS-D-18-0333.1 |
The Control of Surface Friction on the Scales of Baroclinic Eddies in a Homogeneous Quasigeostrophic Two-Layer Model | |
Chang, Chiung-Yin1; Held, Isaac M.2 | |
2019-06-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:6页码:1627-1643 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | In idealized models of the extratropical troposphere, both beta and surface friction can control the equilibrated scales of baroclinic eddies by stopping the inverse cascade. A scaling theory on how surface friction alone sets these scales was proposed by Held in 1999 in the case of a quadratic drag law. However, the theory breaks down when friction is modeled by linear damping, and there are other reasons to suspect that it is oversimplified. An ideal system to test the theory is the homogeneous two-layer quasigeostrophic model in the beta = 0 limit with quadratic damping. This study investigates some numerical simulations of the model to analyze two causes of the theory's breakdown. They are 1) the asymmetry between two layers due to confinement of friction to the lower layer and 2) deviation from a spectrally local inverse energy cascade due to the spread of wavenumbers over which energy is input into the barotropic mode. The former is studied by comparing the simulations with drag appearing asymmetrically or symmetrically between the two layers. The latter is addressed with a heuristic modification of the theory. A regime where eddies equilibrate without an inverse cascade is also examined. A comparison is then made between quadratic and linear drag simulations. The connection to a competing theory based on the dynamics of equivalent barotropic vortices with thermal signatures is further discussed. Finally, we present an example of an inhomogeneous statistically steady state to argue that the diffusivity obtained from the homogeneous model has relevance to more realistic configurations. |
英文关键词 | Eddies Fluxes Turbulence Quasigeostrophic models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000469351300001 |
WOS关键词 | EDDY FLUXES ; TURBULENCE ; DRAG |
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/183878 |
专题 | 地球科学 |
作者单位 | 1.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08544 USA; 2.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA |
推荐引用方式 GB/T 7714 | Chang, Chiung-Yin,Held, Isaac M.. The Control of Surface Friction on the Scales of Baroclinic Eddies in a Homogeneous Quasigeostrophic Two-Layer Model[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(6):1627-1643. |
APA | Chang, Chiung-Yin,&Held, Isaac M..(2019).The Control of Surface Friction on the Scales of Baroclinic Eddies in a Homogeneous Quasigeostrophic Two-Layer Model.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(6),1627-1643. |
MLA | Chang, Chiung-Yin,et al."The Control of Surface Friction on the Scales of Baroclinic Eddies in a Homogeneous Quasigeostrophic Two-Layer Model".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.6(2019):1627-1643. |
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