English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In his mathematical theory, Milankovic finds a link between the heat receivedby the Earth surface per unit time as a function of the solar ephemerids andderives a model of climate changes at periods longer than a few thousand yearsand more. In this paper, we investigate the potential connections of globaltemperature and Earth rotation at much shorter periods, in the complementaryrange of one to a few hundred years. For temperature, we select the HadCrut05.For Earth rotation, defined by pole coordinates and length of day, we use theIERS data sets. Using iterative Singular Spectrum Analysis (iSSA), we extractthe trend and quasi-periodic components of these time series. The firstquasi-periodic components (period ~80-90 years) are expressions of theGleissberg cycle and are identical (at the level of uncertainty of the data).Taken together, the trend and Gleissberg components allow one to reconstruct87% of the variance of the data for lod and 48% for temperature. The next fouriSSA components, with periods ~40, 22, 15 and 9 years. The Lagrange and Laplacetheories imply that the derivative of pole motion should be identical to lodvariations: this strong check is passed by the trend + Gleissbergreconstructions. The annual oscillations of pole motion and lod are linked toannual variations in Sun-Earth distance, in agreement with an astronomical, butnot a climatic origin. The results obtained in this paper for the observedtemperature/rotation couple add to the growing list of evidence of solar andplanetary forcings of gravitational nature on a number of geophysical processes(including sea-level, sea-level pressure, sea-ice extent, oceanic climateindices).

On variations of global mean surface temperature: When Laplace meets Milankovic