The Younger Dryas, which occurred circa 12,900 to 11,700 years BP, was a return to glacial conditions which temporarily reversed the gradual climatic warming after the Last Glacial Maximum (LGM), which lasted from circa 27,000 to 20,000 years BP. The Younger Dryas was the last stage of the Pleistocene epoch that … See more The presence of a distinct cold period at the end of the LGM interval has been known for a long time. Paleobotanical and lithostratigraphic studies of Swedish and Danish bog and lake sites, as in the Allerød clay pit … See more Analyses of stable isotopes from Greenland ice cores provide estimates for the start and end of the Younger Dryas. The analysis of Greenland Summit ice cores, as part of … See more The Younger Dryas is thought to have been caused primarily by significant reduction or shutdown of the North Atlantic "Conveyor" – … See more • 8.2 kiloyear climate event – Rapid global cooling around 8,200 years ago • Preboreal oscillation - Cooling episode within the preboreal • Heinrich event – Large groups of icebergs traverse the North Atlantic. See more Since 1916 and the onset and the subsequent refinement of pollen analytical techniques and a steadily-growing number of pollen diagrams, palynologists have concluded that the … See more In Western Europe and Greenland, the Younger Dryas is a well-defined synchronous cool period. Cooling in the tropical North Atlantic may, however, have preceded it by a … See more The end of the Younger Dryas was caused by an increase in carbon dioxide levels and a shift in Atlantic Meridional Overturning Circulation See more WebSep 8, 2024 · The Younger Dryas (YD), arguably the most widely studied millennial-scale extreme climate event, was characterized by diverse hydroclimate shifts globally and …
New evidence that an extraterrestrial collision 12,800 years ago ...
WebMar 13, 2024 · He's talking about the Younger Dryas Impact Hypothesis, which postulates that a fragmented comet slammed into the Earth close to 12,800 years ago, causing rapid climatic changes, megafaunal... WebJun 26, 2024 · Geologists call this blip of frigid conditions the Younger Dryas, and its cause is a mystery. Most researchers suspect that a large pulse of freshwater from a melting ice sheet and glacial... fully 27.5 zoll
A comet impact may have paved the way for human …
WebThe Younger Dryas event describes the climatic period as the earth moved out of the ice age. Geological evidence is revealing how conditions … WebApr 4, 2024 · The chronology is pinned on accelerator mass spectrometry radiocarbon-dated terrestrial macrofossils at the base of a widespread red-clay bed deposited during flooding from the Lake Superior basin. We illustrate the utility of this record by examining ice-margin retreat and melting through the late Younger Dryas and across the Holocene boundary. fully auto ak 47 for sale