Triskeles and Symmetries of Mean Global Sea-Level Pressure

Lopes, Fabrício Martins; Courtillot, Vincent; Mouël, Jean‐Louis Le

doi:10.3390/atmos13091354

Cited by 8 publications

(19 citation statements)

References 80 publications

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“…[69][70][71]) and variations in the trends of global atmospheric pressure (cf. [6]). These spatial and temporal variations seem to be better explained by Taylor-Couette type flow forced by variations in polar motion (rotation), in essentially the same way as envisioned by Laplace [11].…”

Section: Discussionmentioning

confidence: 99%

“…We have successively analyzed polar motion and length of day [1][2][3], the oceanic climate indices MJO, PDO, ENSO, etc. [4][5][6], and global surface temperatures [7,8], and contributed to the understanding of the solar-terrestrial relationship of sunspot numbers via ISSN [9,10]. The determination of a comprehensive range of pseudo-periodic components of ISSN has even allowed us to propose a prediction of the ongoing solar cycle, Cycle 25.…”

Section: Introductionmentioning

confidence: 99%

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On the Annual and Semi-Annual Components of Variations in Extent of Arctic and Antarctic Sea-Ice

et al. 2023

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In this paper, the 1978–2022 series of northern (NHSI) and southern (SHSI) hemisphere sea ice extent are submitted to singular spectral analysis (SSA). The trends are quasi-linear, decreasing for NHSI (by 58,300 km2/yr) and increasing for SHSI (by 15,400 km2/yr). The amplitude of annual variation in the Antarctic is double that in the Arctic. The semi-annual components are in quadrature. The first three oscillatory components of both NHSI and SHSI, at 1, 1/2, and 1/3 yr, account for more than 95% of the signal variance. The trends are respectively 21 (Antarctic) and 4 times (Arctic) less than the amplitudes of the annual components. We next analyze variations in pole position (PM for polar motion, coordinates m1, m2) and length of day (lod). Whereas the SSA of the lod is dominated by the same first three components as sea ice, the SSA of the PM contains only the 1-yr forced annual oscillation and the Chandler 1.2-yr component. The 1-yr component of NHSI is in phase with that of the lod and in phase opposition with m1, while the reverse holds for the 1-yr component of SHSI. The semi-annual component appears in the lod and not in m1. The annual and semi-annual components of NHSI and SHSI are much larger than the trends, leading us to hypothesize that a geophysical or astronomical forcing might be preferable to the generally accepted forcing factors. The lack of modulation of the largest (SHSI) forced component does suggest an alternate mechanism. In Laplace’s theory of gravitation, the torques exerted by the Moon, Sun, and planets play the leading role as the source of forcing (modulation), leading to changes in the inclination of the Earth’s rotation axis and transferring stresses to the Earth’s envelopes. Laplace assumes that all masses on and in the Earth are set in motion by astronomical forces; more than variations in eccentricity, it is variations in the inclination of the rotation axis that lead to the large annual components of melting and re-freezing of sea-ice.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Annual and Semi-Annual Components of Variations in Extent of Arctic and Antarctic Sea-Ice

et al. 2023

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“…This recent theory contradicts the currently most accepted theory (e.g., Lambeck, 2005), which attributes a key role to atmospheric dynamics (Brzeziński et al, 2002). In this latter theory, seasonal oscillations present in many datasets, including polar motion (e.g., Lambeck, 2005;Le Mouël et al, 2021a;Courtillot et al, 2022b;Lopes et al, 2022b), have generally been considered in terms of angular momentum and interpreted as resulting from mass redistribution of the atmosphere on the rotating Earth. This current theory has not yet been quantitatively validated (see Lambeck (2005), introduction of chapter 7).…”

Section: On Laplace's Theorymentioning

confidence: 90%

On the external forcing of global eruptive activity in the past 300 years

Le Mouël,

Gibert,

Courtillot

et al. 2023

Front. Earth Sci.

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The decryption of the temporal sequence of volcanic eruptions is a key step in better anticipating future events. Volcanic activity results from a complex interaction between internal and external processes, with time scales spanning multiple orders of magnitude. We review periodicities that have been detected or correlated with volcanic eruptions/phenomena and interpreted as resulting from external forces. Taking a global perspective and longer time scales than a few years, we approach this interaction by analyzing three time-series using singular spectral analysis: the global number of volcanic eruptions (NVE) between 1700 and 2022, the number of sunspots (ISSN), a proxy for solar activity, and polar motion (PM) and length of day (lod), two proxies for gravitational force. Several pseudo-periodicities are common to NVE and ISSN, in addition to the 11-year Schwabe cycle that has been reported in previous work, but NVE shares even more periodicities with PM. These quasi-periodic components range from −5 to −130 years. We interpret our analytical results in light of the Laplace’s paradigm and propose that, similarly to the movement of Earth’s rotation axis, global eruptive activity is modulated by commensurable orbital moments of the Jovian planets together with Pluto, whose influence is also detected in solar activity.

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“…There are no other possibilities of natural motion at first order. Inside as well as at its surface the pattern of fluid motion must be the same (cf [33,56]; see [57,58], for some illustrations). We have applied Singular Spectrum Analysis (SSA, eg [61]) in order to extract the trend (this sub-section) and the annual and semi-annual components (next subsection) from the three time series of sea-level at Brest, magnetic field at CLF and length of day.…”

Section: The Magnetostatic Fieldmentioning

confidence: 99%

Is the Earth's magnetic field a constant ? a legacy of Poisson

Mouël¹,

Lopes²,

Courtillot³

et al. 2023

Preprint

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In the report he submitted to the Académie des Sciences, Poisson imagined a set of concentric spheres at the origin of the Earth's magnetic field. It may come as a surprise to many that Poisson as well as Gauss both considered the magnetic field to be constant. We propose in this study to test this surprising assertion for the first time evoked by Poisson (1826). First, we will present a development of Maxwell's equations in the framework of a static electric field and a static magnetic field in order to draw the necessary consequences for the Poisson hypothesis. In a second step, we will see if the observations can be in agreement with Poisson (1826). To do so, we have chosen to compare 1) the polar motion drift and the secular variation of the Earth's magnetic field, 2) the seasonal pseudo-cycles of day length together with those of the sea level recorded by different tide gauges around the globe and those of the Earth's magnetic field recorded in different magnetic observatories. We then propose a mechanism, in the spirit of Poisson, to explain the presence of the 11-year in the magnetic field. We test this mechanism with observations and finally we study closely the evolution of the g10 coefficient *

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Triskeles and Symmetries of Mean Global Sea-Level Pressure

Cited by 8 publications

References 80 publications

On the Annual and Semi-Annual Components of Variations in Extent of Arctic and Antarctic Sea-Ice

On the Annual and Semi-Annual Components of Variations in Extent of Arctic and Antarctic Sea-Ice

On the external forcing of global eruptive activity in the past 300 years

Is the Earth's magnetic field a constant ? a legacy of Poisson

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