In the southern hemisphere, and some areas of the north such as southeastern North America, there was a slight warming.
The presence of a distinct cold period at the end of the Late Glacial interval has been known for a long time.
The application of alkenone paleothermometers to high-resolution paleotemperature reconstructions of older glacial terminations have found that very similar Younger Dryas-like paleoclimatic oscillations occurred during Terminations II and IV.According to the GISP2 ice core from Greenland, the Oldest Dryas occurred between about 15,070 and 14,670 calendar years BP.In the Greenland Summit ice core chronology, the Younger Dryas corresponds to Greenland Stadial 1 (GS-1).The 11,000 radiocarbon years BP dates clearly pre-dates the boundary.The first (oldest) overlying Younger Dryas radiocarbon samples often yielded ages of 10,700–10,600 radiocarbon years BP without any evidence of either an intervening unconformity or other evidence of erosion or nondeposition.
Dating 40 Allerød
Within the Blytt-Sernander classification of north European climatic phases, the prefix ‘Younger’ refers to the recognition that this original ‘Dryas’ period was preceded by a warmer stage, the Allerød oscillation, which in turn was preceded by the Older Dryas around 14,000 calendar years BP.This is not securely dated, and estimates vary by 400 years, but it is generally accepted that it lasted around 200 years., separated by interstadials named after the type localities Bølling and Allerød in Denmark. The biostratigraphic sub-division has been extensively used in northwest Europe, usually in a chronostratigraphic sense, and is still widely used globally.It is thought to have been caused by a decline in the strength of the Atlantic meridional overturning circulation, which transports warm water from the equator towards the North Pole, and which in turn is thought to have been caused by an influx of fresh cold water from North America into the Atlantic.
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