Glacial period(Redirected from Glaciation)
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate between glacial periods. The last glacial period ended about 15,000 years ago. The Holocene epoch is the current interglacial. A time with no glaciers on Earth is considered a greenhouse climate state.
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Quaternary ice ageEdit
Last glacial periodEdit
The last glacial period was the most recent glacial period within the Quaternary Ice Age, occurring in the Pleistocene epoch, which began about 110,000 years ago and ended about 15,000 years ago. The glaciations that occurred during this glacial period covered many areas of the Northern Hemisphere and have different names, depending on their geographic distributions: Wisconsin (in North America), Devensian (in Great Britain), Midlandian (in Ireland), Würm (in the Alps), Weichsel (in northern central Europe), Dali (in East China), Beiye (in North China), Taibai (in Shaanxi) Luojishan (in Southwest Sichuan), Zagunao (in Northwest Sichuan), Tianchi (in Tianshan Mountains) Qomolangma (in Himalaya), and Llanquihue (in Chile). The glacial advance reached its maximum extent about 18,000 BP. In Europe, the ice sheet reached Northern Germany. In the last 650,000 years, there were, on average, seven cycles of glacial advance and retreat.
Next glacial periodEdit
Since orbital variations are predictable, computer models that relate orbital variations to climate can predict future climate possibilities. Duration of last intermissions between glacial periods is about 10.000-12.000 years. Modern warm period is about 10 000 years and new ice age could in principle start at any moment.
Work by Berger and Loutre suggests that the current warm climate may last another 50,000 years. The amount of heat trapping gases emitted into Earth's Oceans and atmosphere will prevent the next glacial period (ice age), which otherwise would begin in around 1,000 years, and likely more glacial cycles.
- Geologic time scale
- Glacial history of Minnesota
- Greenhouse and Icehouse Earth
- Ice age
- Interglacial and Interstadial periods
- Last Glacial Maximum
- Last Glacial Period
- Penultimate Glacial Period
- Milankovitch cycles
- Precession (astronomy)
- Quaternary glaciation
- Snowball Earth
- Timeline of glaciation
- Yarkovsky effect
- YORP effect
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