A Barotropic Envelope Rossby Soliton Model for Block Eddy Interaction. Part I: Effect of Topography
A Barotropic Envelope Rossby Soliton Model for Block Eddy Interaction. Part I: Effect of Topography
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DOI：
10.1175/1186.1
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发表时间：
2005
影响因子：
3.1
通讯作者：
D. Luo
中科院分区：
文献类型：
--
作者：
D. Luo
本文提出了一个新的等效正压β平面通道中的强迫包络Rossby孤立子模型，用以描述初始块体（行星尺度）与短尺度天气尺度涡旋的相互作用。该模型基于两个假设，其动机是：（i）行星尺度波和天气尺度波之间存在纬向尺度分离;（ii）天气尺度纬向波数的范围与行星尺度纬向波数相当。这些假设允许进行分析处理。行星尺度块的演变的天气尺度涡的影响下描述的强迫非线性薛定谔方程，数值求解，而块的发展对预先存在的天气尺度涡的反馈解析推导。结果表明，天气尺度涡旋之间非线性相互作用的行星尺度投影是行星尺度B波放大和衰减的最重要贡献者。
Abstract A new forced envelope Rossby soliton model in an equivalent barotropic beta-plane channel is proposed to describe the interaction between an incipient block (planetary scale) and short synoptic-scale eddies. This model is based on two assumptions, motivated by observations that (i) there exists a zonal scale separation between the planetary-scale and synoptic-scale waves and (ii) that the range of synoptic-scale zonal wavenumber is comparable to the planetary-scale zonal wavenumber. These assumptions allow an analytical treatment. The evolution of the planetary-scale block under the influence of synoptic-scale eddies is described by a forced nonlinear Schrodinger equation that is solved numerically, while the feedback of block development on the preexisting synoptic-scale eddies is derived analytically. It is shown that the planetary-scale projection of the nonlinear interaction between synoptic-scale eddies is the most important contributor to the amplification and decay of the planetary-scale b...