Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0045.1 |
A New Interpretation of Vortex-Split Sudden Stratospheric Warmings in Terms of Equilibrium Statistical Mechanics | |
Yasuda, Yuki1,3; Bouchet, Freddy2; Venaille, Antoine2 | |
2017-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; France |
英文摘要 | Vortex-split sudden stratospheric warmings (S-SSWs) are investigated by using the Japanese 55-year Reanalysis, a spherical barotropic quasigeostrophic (QG) model, and equilibrium statistical mechanics. The statistical mechanics theory predicts a large-scale steady state as the most probable outcome of turbulent stirring, and such a state can be computed without describing all the details of the dynamics. The theory is applied to a disk domain that is modeled on the polar cap north of 45 degrees N in the stratosphere. The equilibrium state is obtained by computing the maximum of an entropy functional. In the range of parameters relevant to the winter stratosphere, this state is anticyclonic. By contrast, cyclonic states are quasi-stationary states corresponding to saddle points of the entropy functional. These results indicate that the mean state of the stratosphere associated with the polar vortex is not close to an equilibrium state but to a quasi-stationary state. The theoretical calculations are compared with the results of a quasi-static experiment in which a wavenumber-2 topographic amplitude is increased linearly and slowly with time. The results suggest that the S-SSW can be qualitatively interpreted as the transition from the cyclonic quasi-stationary state toward the anticyclonic equilibrium state. The polar vortex splits during the transition toward the equilibrium state. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427864800002 |
WOS关键词 | POLAR VORTEX ; VACILLATION MODEL ; SURFACE WEATHER ; DYNAMICS ; EVENTS ; WAVES ; VARIABILITY ; STATES ; VORTICITY ; 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/29650 |
专题 | 地球科学 |
作者单位 | 1.Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba, Japan; 2.Univ Claude Bernard, Univ Lyon, CNRS, Lab Phys,ENS Lyon, Lyon, France; 3.Mitsubishi UFJ Morgan Stanley Secur Co Ltd, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Yasuda, Yuki,Bouchet, Freddy,Venaille, Antoine. A New Interpretation of Vortex-Split Sudden Stratospheric Warmings in Terms of Equilibrium Statistical Mechanics[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(12). |
APA | Yasuda, Yuki,Bouchet, Freddy,&Venaille, Antoine.(2017).A New Interpretation of Vortex-Split Sudden Stratospheric Warmings in Terms of Equilibrium Statistical Mechanics.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(12). |
MLA | Yasuda, Yuki,et al."A New Interpretation of Vortex-Split Sudden Stratospheric Warmings in Terms of Equilibrium Statistical Mechanics".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.12(2017). |
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