Minimal dynamical systems model of the Northern Hemisphere jet stream via embedding of climate data
Minimal dynamical systems model of the Northern Hemisphere jet stream via embedding of climate data
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DOI：
10.5194/esd-10-555-2019
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发表时间：
2018-11
影响因子：
7.3
通讯作者：
Davide Faranda;Yuzuru Sato;G. Messori;N. Moloney;P. Yiou
中科院分区：
文献类型：
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作者：
Davide Faranda;Yuzuru Sato;G. Messori;N. Moloney;P. Yiou
抽象的。通过嵌入大气数据并研究其在不同大气流态下的性质（分叉结构、稳定性、局部维数），我们导出了一个北方半球中纬度急流动力学的最小动力系统模型。推导是一个三步的过程：首先，我们得到一个1-D描述的中纬度急流计算的位置，在每个经度使用ERA-Interim的射流。接下来，我们使用嵌入过程来导出局部射流位置动态的地图。最后，我们介绍了大气湍流和地形扰动对急流的耦合和随机效应。然后，我们分析了不同制度的模型的动力学性质：一个，给出了最接近的表示从真实的数据中提取的属性;一个具有较强的射流（强耦合）;一个具有较弱的射流（弱耦合）;和一个修改的地形。我们的模型，尽管它的简单，提供了一个指导性的描述大气射流的动力学特性。
Abstract. We derive a minimal dynamical systems model for the Northern Hemisphere midlatitude jet dynamics by embedding atmospheric data and by investigating its properties (bifurcation structure, stability, local dimensions) for different atmospheric flow regimes. The derivation is a three-step process: first, we obtain a 1-D description of the midlatitude jet stream by computing the position of the jet at each longitude using ERA-Interim. Next, we use the embedding procedure to derive a map of the local jet position dynamics. Finally, we introduce the coupling and stochastic effects deriving from both atmospheric turbulence and topographic disturbances to the jet. We then analyze the dynamical properties of the model in different regimes: one that gives the closest representation of the properties extracted from real data; one featuring a stronger jet (strong coupling); one featuring a weaker jet (weak coupling); and one with modified topography. Our model, notwithstanding its simplicity, provides an instructive description of the dynamical properties of the atmospheric jet.