Metraipolis › archive › dc_2d428aeef8ab

100,000-year problem — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/100,000-year_problem
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T11:36:51.952Z
SHA-256 of the archived text: a0c85d6a0931f05a479da3ab3e5d50907bba5cadf94cd27562cede54bf53ee66
Stable URL of this page: https://metraipolis.com/documento/dc_2d428aeef8ab

How to cite

100,000-year problem — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/100,000-year_problem (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_2d428aeef8ab (Metraipolis archive dc_2d428aeef8ab, sha256 a0c85d6a0931f05a479da3ab3e5d50907bba5cadf94cd27562cede54bf53ee66)

BibTeX

@misc{dc2d428aeef8ab,
  title = {100,000-year problem — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/100,000-year_problem},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_2d428aeef8ab; sha256 a0c85d6a0931f05a479da3ab3e5d50907bba5cadf94cd27562cede54bf53ee66},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/100,000-year_problem. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The 100,000-year problem (also 100 ky problem or 100 ka problem) of the Milankovitch theory of orbital forcing refers to a discrepancy between the reconstructed geologic temperature record and the reconstructed amount of incoming solar radiation, or insolation over the past 800,000 years. Due to variations in the Earth's orbit, the amount of insolation varies with periods of around 21,000, 40,000, 100,000, and 400,000 years. Variations in the amount of incident solar energy drive changes in the climate of the Earth, and are recognised as a key factor in the timing of initiation and termination of glaciations. While there is a Milankovitch cycle in the range of 100,000 years, related to Earth's orbital eccentricity, its contribution to variation in insolation is much smaller than those of precession and obliquity. The 100,000-year problem refers to the lack of an obvious explanation for the periodicity of ice ages at roughly 100,000 years for the past million years, but not before, when the dominant periodicity corresponded to 41,000 years. The unexplained transition between the two periodicity regimes is known as the Mid-Pleistocene Transition, dated to some 800,000 years ago. The related 400,000-year problem refers to the absence of a 400,000-year periodicity due to orbital eccentricity in the geological temperature record over the past 1.2 million years. The transition in periodicity from 41,000 years to 100,000 years can now be reproduced in numerical simulations that include a decreasing trend in carbon dioxide and glacially induced removal of regolith, as explained in more detail in the article Mid-Pleistocene Transition.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «100,000-year problem» — https://en.wikipedia.org/wiki/100,000-year_problem
Wikidata Q1149923 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q1149923
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/100,000-year_problem?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1375253824, consultata il 2026-10-07T11:18:59.781Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 501222adca620ddef7a5ae2183a6f7d3ed27b5cf5a5cb674750faecccebf77cb