Based on Singular Spectral Analysis (SSA) analysis of global earth surface temperature and solar activity (sunspots), Le Mouël et al. (2020, https://doi.org/10.1029/2019EA000671) suggest that the variability in Earth surface temperature observed since 1850 is natural and controlled by the Sun. We cannot agree with their conclusions for several reasons: the lack of compelling results from the Fourier spectra and SSA estimates which are provided without confidence intervals, the small radiative forcing associated with the sunspot variability, and finally the simple evidence that the slowly varying components of the temperature and sunspots time show opposite trends in the last 30 years.

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JL LeMouël，F。Lopes和V. Courtillot对“过去150年全球地表温度从十年代到百年变化的特征时间尺度”的评论

LeMouël等人基于奇异光谱分析（SSA）对全球地球表面温度和太阳活动（太阳黑子）的分析。（2020，https://doi.org/10.1029/2019EA000671）提出，自1850年以来观测到的地球表面温度的变化是自然的，并且受太阳控制。由于以下几个原因，我们无法同意他们的结论：缺乏傅里叶光谱和SSA估计而没有令人信服的区间提供令人信服的结果；与太阳黑子变异性相关的辐射强迫小；最后有简单的证据表明，太阳黑子的组成缓慢变化在过去的30年中，温度和太阳黑子的时间显示出相反的趋势。