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- W2980462757 abstract "Abstract We apply singular spectral analysis (SSA) to series of monthly mean values of surface air temperatures T , International sunspot number (ISSN), and polar faculae PF (1850–2017 for T and ISSN). The efficiency of the SSA algorithm that we use has been regularly improved. For the T , ISSN, and PF series, the SSA eigenvalues and first components are shown with their Fourier spectrum. Components of T , ISSN, or PF share similar periods. Most are found in solar activity. The ~22‐ and ~11‐year components are modulated and drift in phase, reflecting slight differences in spectra. On the shorter‐period side, components at ~9, ~5.5, and ~4.7 years are in good agreement. They have been identified in solar activity. The 60‐year component is prominent in T . It is not immediately apparent in ISSN but can be extracted with an appropriate choice of SSA window. Other types of data allow one to explore longer periods and confirm climatic variations at ~60, ~35, and ~22 years and at 50–150 and 200–500 years. When we consider a longer ISSN series starting in 1700 and recalculate the SSA first component, the trends of solar activity and temperature over the time span from 1850 to 2017 are very similar, with slower rise before 1900 and after the late 1900s, separating a faster rise in much of the twentieth century. These trends, extracted over only 150 years, could be parts of longer, multicentennial changes in solar activity. Much of the variability of surface temperatures could be linked to the Sun." @default.
- W2980462757 created "2019-10-25" @default.
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- W2980462757 date "2020-04-01" @default.
- W2980462757 modified "2023-10-12" @default.
- W2980462757 title "Characteristic Time Scales of Decadal to Centennial Changes in Global Surface Temperatures Over the Past 150 Years" @default.
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- W2980462757 doi "https://doi.org/10.1029/2019ea000671" @default.
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