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glacial period

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glacial period
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{{redirect|Glacial|the science fiction short story|Glacial (short story)}}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.JOURNAL, J. Severinghaus, E. Brook, Abrupt Climate Change at the End of the Last Glacial Period Inferred from Trapped Air in Polar Ice, Science, 286, 1999, 930–4,weblink 10.1126/science.286.5441.930, 10542141, 5441, The Holocene epoch is the current interglacial. A time when there are no glaciers on Earth is considered a greenhouse climate state.BOOK, Bralower, T.J., Premoli Silva, Malone, I., M.J., 2006, Leg 198 Synthesis : A Remarkable 120-m.y. Record of Climate and Oceanography from Shatsky Rise, Northwest Pacific Ocean, Abstract Summary, Proceedings of the Ocean drilling program., 47, 10.2973/odp.proc.ir.198.2002, 1096-2158, April 9, 2014, JOURNAL
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, Christopher M. Fedo, Grant M. Young, H. Wayne Nesbitt, Paleoclimatic control on the composition of the Paleoproterozoic Serpent Formation, Huronian Supergroup, Canada: a greenhouse to icehouse transition
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{{Wiktionary|glaciation}}

Quaternary ice age

File:Co2 glacial cycles 800k.png|320px|thumb|Glacial and interglacial cycles as represented by atmospheric CO2, measured from ice core samples going back 800,000 years. The stage names are part of the North American and the European Alpine subdivisions. The correlation between both subdivisions is tentative.]]Within the Quaternary glaciation (2.6 Ma to present), there have been a number of glacials and interglacials.

Last glacial period

The last glacial period was the most recent glacial period within the Quaternary glaciation of the Current 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 period

{{see also|Milankovitch cycles}}Since orbital variations are predictable,JOURNAL, F. Varadi, B. Runnegar, M. Ghil, Successive Refinements in Long-Term Integrations of Planetary Orbits, The Astrophysical Journal, 592, 2003, 620–630,weblink 10.1086/375560, 2003ApJ...592..620V, yes,weblink" title="web.archive.org/web/20071128074218weblink">weblink 2007-11-28, computer models that relate orbital variations to climate can predict future climate possibilities. Two caveats are necessary: that anthropogenic effects (human-assisted global warming) are likely to exert a larger influence over the short term; and that the mechanism by which orbital forcing influences climate is not well understood.Work by Berger and Loutre suggests that the current warm climate may last another 50,000 years.JOURNAL, Berger A, Loutre MF, Climate: An exceptionally long interglacial ahead?, Science, 297, 5585, 2002, 1287–8, 10.1126/science.1076120, 12193773,

See also

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References

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External links

{{Ice Ages}}

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