Milankovitch Cycles (overview)
First published: 2023
Brief summary
General reference on Earth's orbital cycles (eccentricity, obliquity, axial precession) and their role in ice age timing, including the unresolved '100 kyr problem'.
Article
Milankovitch Cycles (overview) is an encyclopedic / general reference published by Wikipedia (hosted via Harvard course page) in 2023. It presents a general reference on Earth's orbital cycles (eccentricity, obliquity, axial precession) and their role in ice age timing, including the unresolved '100 kyr problem'.
The analysis focuses on 41 kyr (obliquity), ~100 kyr (eccentricity, dominant in last 1 Myr). It also considers notes shift from 41 kyr to 100 kyr dominant mode ~1 Myr ago, cause unresolved. This gives the cycle claim a specific numerical and evidential setting rather than presenting periodicity only as a visual impression.
The article reports the following result: Some researchers interpret climate records of the last million years as showing a single spectral peak at 100 ka periodicity. From 1-3 million years ago climate had a dominant mode matching the 41 ka obliquity cycle; after 1 million years ago this changed to 100 ka. The interpretation is strongest when it survives proxy uncertainty, model choice, dating error and comparison with established solar, orbital and ocean-atmosphere forcing.
For cycles researchers, the article brings together milankovitch cycles, orbital eccentricity, obliquity, axial precession. It is relevant to climate-cycle research because observed periodicities may arise from orbital forcing, solar variability, ocean-atmosphere dynamics or internal stochastic behaviour.
Because this is an encyclopedic / general reference, it is best used as an accessible introduction or perspective rather than as conclusive evidence. Forum discussion should follow its references back to the primary data and original research wherever possible.
Source details and credits
- Source / publisher: Wikipedia (hosted via Harvard course page)
- Source type: Encyclopedic / general reference
- URL type: PDF
- Credits: Wikipedia (hosted via Harvard course page)
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