Modelling cycles in climate series: The fractional sinusoidal waveform process
气候序列中的周期建模:分数阶正弦波过程AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要核心是持续周期、分数阶噪声、自协方差及谱结构的时间序列建模,应用对象为气候序列。
气候序列中的周期建模:分数阶正弦波过程AI 解读 ↓
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The paper proposes a novel model for time series displaying persistent stationary cycles, the fractional sinusoidal waveform process. The underlying idea is to allow the parameters that regulate the amplitude and phase to evolve according to fractional noise processes. Its advantages with respect to popular alternative specifications, such as the Gegenbauer process, are twofold: the autocovariance function is available in closed form, which opens the way to exact maximum likelihood estimation; secondly, the model encompasses deterministic cycles, so that discrete spectra arise as a limiting case. A generalization of the process, featuring multiple components, an additive ‘red noise’ component and exogenous variables, provides the basic model for climate time series with mixed spectra. Our illustrations deal with the change in amplitude and phase of the intra-annual component of carbon dioxide concentrations in Mauna Loa, and with the estimation and the quantification of the contribution of orbital cycles to the variability of paleoclimate time series.
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