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How Planetary And Solar Oscillations Affect Earth’s Temperature Cycles

by Antero OIlila, Ph.D., guest post
January 04, 2023, 8:07 AM
in News and Opinion
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solar earthThe mechanism and even the existence of the Atlantic Multidecadal Oscillation (AMO) have remained under debate among climate researchers, and the same applies to general temperature oscillations of a 60- to 90-year period.

The recently published study of Ollila and Timonen has found that these oscillations are real and they are related to 60- and 88-year periodicities originating from the planetary and solar activity oscillations.

These oscillations can be observed in the Atlantic Multidecadal Oscillation (AMO), the Pacific Multidecadal Oscillation (PMO), and actually in the global surface temperature (GST). The similarities between the GST, AMO, PMO, and AHR (Astronomical Harmonic Resonances) are obvious in Fig. 1.

Fig. 1. The 60-year fluctuations of AMO, PMO, AHR, and temperature trend of HadCRUT5. The AHR trend is from the study of Ollila (2017), and the PMO has been digitized from Figure 5 of Chen et al. (2016) with 2-year steps.

The oscillations are not limited only to temperatures. Researchers have studied oscillations of day lengths, magnetic field magnitudes, sunspot lengths, auroral records, cosmogenic isotopes like 14C and 10Be, Indian moons intensities, sediments of NE Pacific, 14C of tree-rings, and sea carbonates.

The oscillations periods of these studies vary from 60 to 90 years. The most common and prominent periodicity is 88 years and is called the Gleissberg cycle. Named after Wolfgang Gleissberg, who discovered in 1958 that solar cycles weaken and strengthen over about 80 years.

The sun has been suggested to be the origin of an 88-year oscillation since this period can be connected to the repetitive occurrence of the basic Schwabe cycle of 11 years. This solar cycle length varies typically from 10 to 14 years, which explains why the Gleissberg cycle length varies around 88 years.

The other main periodicity of the research studies is around 60 years. The researchers normally suggest no origin for this periodicity.

Ermakov, Scafetta, and Ollila have analyzed that the orbital periods of Jupiter and Saturn can create temperature variations of 60 years by moving the solar system barycenter, which causes variations in the cosmic dust amount entering the atmosphere. The temperature effect happens through cloudiness variations.

The authors have studied how well the variations of astronomical harmonic resonances (AHR) could explain the 60-year temperature variations, which are based on instrumental records and on the tree-ring data of the supra-long Scots pine tree-ring record for northern Finnish Lapland (subsequently called the Finnish timberline pine chronology (FTPC)), stretching to the year 5634 BC.

The strong feature of the FTPC tree-sing signal is the one-year accuracy of the tree-ring method and therefore it is the most effective form of proxy information on the past climate.

The radial growth of (tree-ring width) is regulated by the average summer temperature in cool areas and precipitation in arid areas. The minimum factor for pine growth in Lapland (the northern part of Finland) is temperature.

The FTPC tree-ring series is the longest tree-type series in the world. The explanation is that so-called pine subfossils once sank into the oxygen-free swamps and the bottom mud of lakes for millennia.

The FFT (Fast Fourier Transform) analysis was carried for finding out the main periods for the FTPC signal, the AHR signal, and the Ljungqvist temperature proxy data, Fig. 2.

Fig. 2. FFT (Fast Fourier Transform) of the tree-ring data (FTPC), AHR, and Ljungqvist temperature proxy data.

These analyses show that the well-known Gleissberg cycle of 80 to 90 years is the dominating cycle caused by the sun’s activity changes but the observed 60-year cycle can be connected to the dominant frequency of the AHR signal.

The authors have combined the AHR signal and the Gleissberg signal. These signals had a common maximum in 1941 which explains the warm period of the 1930s.

These two oscillations may also be in opposite phases or close maximum or minimum phases. In Fig. 3 the combined signal of 60- and the 88-year signal is the blue break line curve and the red curve is the FTPC signal.

Fig. 3. FTPC signal and combined effect of 60- and 88-year signals.

It is easy to see by the naked eye that the ups and downs of these two trends happen close to each other. The FTPC curve is spikier and the authors have identified that the identified volcanic eruptions are the main causes of these deviations.

The IPCC does not recognize non-anthropogenic temperature variations originating from changes in the Sun’s activity or planetary oscillations.

The 60- and 88-year oscillations explain the well-known temperature oscillations for the 1900s and our study shows that these oscillations are a permanent phenomenon affecting the global surface temperature on a millennia scale.

This study utilized detrended temperature data of HadCRUT5 and the purpose was not to find out the long-term (from 100 to 1,000 years) temperature effects of solar activity changes.

The maximum combined temperature effect of AMO and Gleissberg oscillations was in 2020, and now their impact is slowly descending. In addition to these oscillations’ impacts, the Sun’s activity seems to also decrease.

The original study has been published by Wiley Online Library (The Royal Meteorological Society) and it contains more detailed analyses and figures: https://doi.org/10.1002/joc.7912


Dr. Antero OIlila is the author of 21 climate research articles. His results are not in line with the IPCC science like greenhouse effect specification, climate sensitivity, anthropogenic CO2 amount, and residence time. His website is https://www.climatexam.com.

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  1. Spurwing Plover says:
    2 years ago

    Solar flares and sun spots also effect our weather more then our back yard BBQ.s and SUV,s do

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