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DOI | 10.1073/pnas.1916272117 |
The vortex gas scaling regime of baroclinic turbulence | |
Gallet, Basile1; Ferrari, Raffaele2 | |
2020-03-03 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:9页码:4491-4497 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA |
英文摘要 | The mean state of the atmosphere and ocean is set through a balance between external forcing (radiation, winds, heat and freshwater fluxes) and the emergent turbulence, which transfers energy to dissipative structures. The forcing gives rise to jets in the atmosphere and currents in the ocean, which spontaneously develop turbulent eddies through the baroclinic instability. A critical step in the development of a theory of climate is to properly include the eddy-induced turbulent transport of properties like heat, moisture, and carbon. In the linear stages, baroclinic instability generates flow structures at the Rossby deformation radius, a length scale of order 1,000 km in the atmosphere and 100 km in the ocean, smaller than the planetary scale and the typical extent of ocean basins, respectively. There is, therefore, a separation of scales between the large-scale gradient of properties like temperature and the smaller eddies that advect it randomly, inducing effective diffusion. Numerical solutions show that such scale separation remains in the strongly nonlinear turbulent regime, provided there is sufficient drag at the bottom of the atmosphere and ocean. We compute the scaling laws governing the eddy-driven transport associated with baroclinic turbulence. First, we provide a theoretical underpinning for empirical scaling laws reported in previous studies, for different formulations of the bottom drag law. Second, these scaling laws are shown to provide an important first step toward an accurate local closure to predict the impact of baroclinic turbulence in setting the large-scale temperature profiles in the atmosphere and ocean. |
英文关键词 | oceanography atmospheric dynamics turbulence |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000518473500016 |
WOS关键词 | GEOSTROPHIC TURBULENCE ; EDDY FLUXES ; ENERGY ; MACROTURBULENCE ; FRICTION ; CASCADE ; EDDIES ; MODEL ; DRAG |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/249596 |
专题 | 地球科学 |
作者单位 | 1.Univ Paris Saclay, CNRS, Serv Phys Etat Condense, Commissariat Energie Atom Saclay,UMR 3680, F-91191 Gif Sur Yvette, France; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Gallet, Basile,Ferrari, Raffaele. The vortex gas scaling regime of baroclinic turbulence[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(9):4491-4497. |
APA | Gallet, Basile,&Ferrari, Raffaele.(2020).The vortex gas scaling regime of baroclinic turbulence.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(9),4491-4497. |
MLA | Gallet, Basile,et al."The vortex gas scaling regime of baroclinic turbulence".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.9(2020):4491-4497. |
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