A nonlinear oscillator describing storm track variability
A nonlinear oscillator describing storm track variability
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DOI：
10.1002/qj.2352
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发表时间：
2014-10-01
影响因子：
8.9
通讯作者：
Novak, Lenka
中科院分区：
文献类型：
--
作者：
Ambaum, Maarten H. P.;Novak, Lenka
我们构建了一个双变量模型，描述了当地斜压性和涡动热通量之间的相互作用，以了解风暴路径的方差方面。它是一个接近斜压中性的非绝热强迫斜压不稳定的启发式模式。双变量模型具有非线性振子的结构。它表现出观测到的风暴轴变化的一些现实属性，最显着的涡动活动的间歇性。这表明，明显的阈值行为可以更准确和简洁地描述了一个简单的非线性。一个类比是绘制与对流事件的触发。
We construct a two-variable model that describes the interaction between local baroclinicity and eddy heat flux in order to understand aspects of the variance in storm tracks. It is a heuristic model for diabatically forced baroclinic instability close to baroclinic neutrality. The two-variable model has the structure of a nonlinear oscillator. It exhibits some realistic properties of observed storm track variability, most notably the intermittent nature of eddy activity. This suggests that apparent threshold behaviour can be more accurately and succinctly described by a simple nonlinearity. An analogy is drawn with the triggering of convective events.