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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Energy Spectrum and Energy Flow of the Arctic Oscillation in the Phase Speed Domain
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Energy Spectrum and Energy Flow of the Arctic Oscillation in the Phase Speed Domain

机译：相速度域中北极涛动的能谱和能流

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References(15) Cited-By(3) Supplementary materials(4) In this study, energy spectrum and energy flow of the large-scale atmospheric motions are examined in reference to the Arctic Oscillation index. Attention is concentrated to the barotropic component of the atmosphere in the framework of the 3D normal mode decomposition.According to the result of the observational analysis in the phase speed domain, the Arctic Oscillation (AO) is characterized as the energy increase at the meridional index l=3 with simultaneous decrease at l=5 of the zonal field. The result is consistent with the theory of the AO by the singular eigenmode of the global atmosphere. The accumulation of energy at the eigenmode of the AO is explained by the enhanced energy flux FZi associated with the zonal-wave interaction.It is found in this study that the energy flux FZi comes from eddies at the spherical Rhines speed cR where the planetary-scale Rossby wave becomes stationary. The result suggests that the low-frequency variability associated with the AO is maintained by energy flux from cR, which is compensated by the up-scale energy cascade from synoptic eddies in addition to the forced stationary planetary waves by topography.
机译：参考文献（15）被引用的文献（3）补充材料（4）在这项研究中，参照北极涛动指数研究了大规模大气运动的能谱和能量流。在3D正态分解的框架下，注意力集中在大气的正压分量上。根据相速度域的观测分析结果，北极涛动（AO）的特征是子午线能量在子午指数处增加l = 3，同时在纬向区域的l = 5处减小。结果与全球大气奇异本征模态与AO理论相吻合。 AO的本征模下的能量积累是通过与波与波的相互作用相关的增强的能量通量FZi来解释的。在这项研究中发现，能量通量FZi来自球面莱茵速度cR时的涡流，其中行星-规模的Rossby波变得平稳。结果表明，与AO相关的低频可变性由来自cR的能量通量来维持，该能量通量除了由地形强迫的固定行星波外，还由天气旋涡的高档能量级联所补偿。

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