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The Younger Dryas (YD, Greenland Stadial GS-1) [2] was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years Before Present (BP). [3] It is primarily known for the sudden or "abrupt" cooling in the Northern Hemisphere, when the North Atlantic Ocean cooled and annual air temperatures decreased by ~3 °C (5.4 °F) over North America, 2–6 °C (3.6–10.8 °F) in Europe ...
The Younger Dryas impact hypothesis (YDIH) proposes that the onset of the Younger Dryas (YD) cool period at the end of the Last Glacial Period, around 12,900 years ago was the result of some kind of cosmic event with specific details varying between publications. [1]: Sec 1 The hypothesis is widely rejected by relevant experts.
The Younger Dryas was the last stage of the Pleistocene epoch that spanned from 2,580,000 to 11,700 years BP and it preceded the current, warmer Holocene epoch. The Younger Dryas was the most severe and longest lasting of several interruptions to the warming of the Earth's climate, and it was preceded by the Late Glacial Interstadial , an ...
Articles relating to the Younger Dryas impact hypothesis and its depictions. It is a speculative attempt to explain the onset of the Younger Dryas (YD) as an alternative to the long-standing and widely accepted cause due to a significant reduction or shutdown of the North Atlantic "Conveyor" in response to a sudden influx of freshwater from Lake Agassiz and deglaciation in North America.
The Oldest, Older, and Younger Dryas are three stadials that occurred during the warming since the Last Glacial Maximum. The Older Dryas occurred between the Bølling and Allerød interstadials. All three periods are named for the arctic plant species, Dryas octopetala, which proliferated during these cold periods.
The draining of 13,000 years ago may be the cause of the Younger Dryas stadial. [ 2 ] [ 14 ] [ 15 ] [ 12 ] Although disputed, [ 16 ] the draining at 9,900–10,000 years ago may be the cause of the 8,200 yr climate event .
The last Ice Age was followed by the Late Glacial Interstadial, a period of global warming to 12.9 ka, and the Younger Dryas, a return to glacial conditions until 11.7 ka. Paleoclimatology holds that there was a sequence of stadials and interstadials from about 16 ka until the end of the Pleistocene.
The study, conducted under ONA head Andrew Marshall, modeled its prospective climate change on the 8.2 kiloyear event, precisely because it was the middle alternative between the Younger Dryas and the milder Little Ice Age. [29]