Why is the Earth System Oscillating at a 6-Year Period?

Anny Cazenave, Julia Pfeffer, Mioara Mandea, Véronique Dehant, Nicolas Gillet

Abstract readReview

In one paragraph

Review in Surveys in geophysics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it

0cells of the map it votes in

1citing papers in PubMed

–field-weighted citation impact

1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

Variability of annual polar motion and its relationship to the Chandler wobble.Proceedings of the National Academy of Sciences of the United States of America · 2025
Article

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Anny CazenaveUniversité Toulouse III, LEGOS (CNES/CNRS/IRD/UT3), 18 Avenue Edouard Belin, 31401 Toulouse, Cedex 9, France.ORCID 0000-0002-2289-1858

Julia PfefferMagellium, 1 Rue Ariane, 31520 Ramonville-Saint-Agne, France.

Mioara MandeaCentre National d'Etudes Spatiales, CNES, 2 Place Maurice Quentin, Paris, France.

Véronique DehantRoyal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium.

Nicolas GilletUniversite. Grenoble Alpes, Universite. Savoie Mont Blanc, CNRS, IRD, Universite Gustave Eiffel, ISTerre, 38000 Grenoble, France.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

A 6-year cycle has long been recognized to influence the Earth's rotation, the internal magnetic field and motions in the fluid Earth's core. Recent observations have revealed that a 6-year cycle also affects the angular momentum of the atmosphere and several climatic parameters, including global mean sea level rise, precipitation, land hydrology, Arctic surface temperature, ocean heat content and natural climate modes. In this review, we first present observational evidences supporting the existence of a 6-year cycle in the Earth system, from its deep interior to the climate system. We then explore potential links between the Earth's core, mantle and atmosphere that might explain the observations, and investigate various mechanisms that could drive the observed 6-year oscillation throughout the whole Earth system.

Indexed as

6-year cycleClimateCore motionsEarth’s rotationGravity fieldMagnetic field

Identifiers

PMID40458537

DOI10.1007/s10712-024-09874-4

PMCPMC12126356

What OpenQuestion holds

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LicenceCC BY

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.