This occurred at the end of the Pleistocene epoch and just before the present, warmer, Holocene epoch. About 14,500 years ago, Earth's climate began to shift from a cold glacial world to a warmer interglacial state. In northern Scotland , the glaciers were thicker and deeper during the Older Dryas than the succeeding Younger Dryas, and there is no evidence of human occupation of Britain . In July 2018, this was the subject of a Media blitz, establishing a narrative whereby the "same forces that were at work then" (deglaciation) could cause a sudden cooling now. If you would like to participate, you can choose to edit this article, or visit the project page for more information. Other proxy records, including varved lake sediments in Europe, also display these abrupt shifts (Brauer et al. Biology. [2] It reversed the gradual climatic warming which started around 20,000 years ago. The Younger Dryas, named after a small white and yellow arctic flower that flourished during the cold snap, has long fascinated scientists. A more northerly routing of meltwater has a greater impact on the salinity and density of the surface ocean in the North Atlantic, which can cause a slowing of the ocean's thermohaline circulation and climate changes around the world. One of two periods of cold and increased glaciation thousands of years before the present (Younger Dryas and Older Dryas). Dryas is the Duke of Leonster in Fire Emblem: Thracia 776 and the father of Selphina. Before the events of Thracia 776, Dryas had been training young Leonster knights under the protection of Hannibal of southern Thracia. Scientists have … ヤンガードリアスは、最終氷期が終わり温暖化が始まった状態から急激に寒冷化に戻った現象で、現在から12,900年から11,500年前にかけて北半球の高緯度で起こった。この変化は数十年の期間で起きたとされている。グリーンランドの氷床コアGISP2の同位体データはこの間、グリーンランドの山頂部では現在よりも15℃寒冷であったことを示している（Alley et. The time period to which the layer corresponds varies between regions, but it is generally dated as starting at 18.5-17 ka BP and ending 15-14 ka BP. 2011). It may have been caused by an influx of fresh, cold water from North America to the Atlantic. [citation needed As with the Younger and Older Dryas events, the stratigraphic layer is … ヤンガードリアス（ Younger Dryas ）は、更新世の終わりのヨーロッパの 気候区分 [要検証 – ノート] で、亜氷期の期間である。 ヤンガードライアス 、新ドリアス期 とも呼ばれる。 また、ヤンガードリアス期の寒冷化はヤンガードリアスイベント（YD）とも呼ばれる This page was last changed on 28 December 2020, at 19:27. The temperatures dropped massively entering into a near-glacial period where it was cold and windy and this is what is known as the Younger Dryas (YD)… The Younger Dryas is one of the most well known examples of abrupt change. It reversed the gradual climatic warming which started around 20,000 years ago. I had a reply here but on further thought I decided I would do some reading on Hancock’s contribution to the Younger Dryas hypothesis. The Younger Dryas occurred during the transition from the last glacial period into the present interglacial (the Holocene). 2007)… The effects were complex and variable. The turbulent conditions of the Younger Dryas event point to a much more cataclysmic demise of the North American Megafauna, rather than a gradual human-driven extinction. The Younger Dryas was a major and abrupt change of the world climate which happened from roughly 12,900 to around 11,700 before present time (BP). 2001). Wiki not only suggests that he wasn’t the first but that his contributions to theories largely amount to other claims which are just as hard to substantiate (ie cyclical nature of impacts) [0]. The ice core record at Dome C shows that climate changes in Antarctica were out-of-phase with those in the Northern Hemisphere (EPICA Community Members 2004). In the Southern Hemisphere and some areas of the Northern Hemisphere, such as southeastern North America, a slight warming occurred. The Younger Dryas" (em inglês)Lev Tarasov and W.R. Peltier, "Arctic freshwater forcing of the Younger Dryas cold reversal" letter, in Nature 435, 662-665 (2 June 2005) (em inglês)"Hugheus radiocarbon and climate shifts during the last deglaciation" The gradual warming since the Last Glacial Maximum (27,000 to 24,000 years BP) has been interrupted by two cold spells: the Older Dryas and the Younger Dryas (c. 12,900–11,650 BP). [1] It caused their main source of … He lost his right arm during a battle in Ulster. Partway through this transition, temperatures in the Northern Hemisphere suddenly returned to near-glacial conditions. The Younger Dryas is clearly observable in paleoclimate records from many parts of the world. 2004; Praetorius et al. The Younger Dryas is one of the most well known examples of abrupt change. [21] It is argued that the cold and dry Younger Dryas lowered the carrying capacity of the area and forced the sedentary Early Natufian population into a more mobile subsistence pattern. A devoted warrior and strategic mind who was willing to sacrifice anything for the future of Leonster, Dryas played a key role in ensuring the young prince Leif survived the kingdom's downfall, and years later served as a tactician and advisor to the prince in his revolutionary war against the Grannvale Empire's control of Leonster. 2008). This occurred at the end of the Pleistocene epoch and just before the present, warmer, Holocene epoch. A reduction in TSI as part of a 2,500 "quasicycle" : http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.483.2889&rep=rep1&type=pdf, https://wiki.iceagefarmer.com/index.php?title=Younger_Dryas&oldid=1319. The end of this period is claimed, by certain academic circles, to have witnessed a sky phenomena (namely a plasma / … At Dome C, the amount of the hydrogen isotope called deuterium, expressed here as δD, is proportional to temperature. This page was last edited on 14 July 2018, at 20:30. These 1200 years mark the transition out of the last great ice age. Scientists have hypothesized that, just prior to the Younger Dryas, meltwater fluxes were rerouted from the Mississippi River to the St. Lawrence River. Starting about 12,900 years ago, the Northern Hemisphere was abruptly gripped by centuries of cold, an era technically known as the Younger Dryas. The Oldest Dryas is a biostratigraphic subdivision layer corresponding to an abrupt cooling event, or stadial, which occurred during the last glacial retreat. The Younger Dryas (around 12,900 to 11,700 years ago) was a cold period. [4], The Younger Dryas was a period of climatic change. [5], From Simple English Wikipedia, the free encyclopedia, "Mapping Post-Glacial expansions: the peopling of Southwest Asia", "A new Greenland ice core chronology for the last glacial termination", https://simple.wikipedia.org/w/index.php?title=Younger_Dryas&oldid=7230631, Creative Commons Attribution/Share-Alike License. Two major dry fluctuations occurred; during the Younger Dryas and the short 8.2 kiloyear event. Nuorempi Dryas: 11 560–12 700 Allerød: 12 700–13 350 Vanhempi Dryas: 13 350–13 480 Bølling: 13 480–13 730 Vanhin Dryas: 13 780–13 860 Meiendorf: 13 860–14 500 Keski-Veiksel-kausi: LGM: 18 000–28 000 Denekamp: 28 000–32 000 Hengelo: 36 900–38 700 Moershoofd: Glinde: 48 000–51 000 Ebersdorf: Oerel: 55 400–57 700 Schalkholz In many parts of the Northern Hemisphere tropics, conditions also became drier (Hughen et al. The last glacial maximum (LGM) was about 27,000 to 24,000 years ago. The Younger Dryas (around 12,900 to 11,700 years ago) was a cold period. 2007), although other possible routings such as to the Mackenzie River cannot be ruled out presently. His theory came from studying the scarred landscapes of North America. Ice sheets covered most of North America in particular, and also Europe. The Younger Dryas and Older Dryas stadials are geological periods of cold temperature that are named after Dryas octopetala, which flourished during that time and is used as a fossil indicator of those periods. [1][2]. But then again, this paper suggests that even those who attribute the YD to AMOC are missing the boat -- they pin the blame on solar output dropping. This pattern, sometimes called the "bipolar see-saw," is observable when comparing the GISP2 and Dome C records for the Younger Dryas (EPICA Community Members 2004). The Younger Dryas is one of the best known examples of abrupt climate change.
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