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YDYoung Democrats
YDYounger Dryas (prehistoric climate period)
YDYear Date (date on a stamp; philately)
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References in periodicals archive ?
This record showed that around 13,000 years ago, the AMOC weakened about 400 years before the beginning of a major cold spell, known as the Younger Dryas, in which an abrupt temperature drop of about 6[degrees]C occurred over Greenland.
As for the chart generated from ice cores from Greenland concerning Younger Dryas which accompanied a recent letter from Geoffrey Evans, that too may well be rather local, as cores in Antarctica show warming.
Or in disaster movies." He does look back to the Younger Dryas, but no further.
No dating has been performed for the bottommost sand horizon, meaning that this horizon may have been accumulated, for example, during the cold Younger Dryas. Following this assumption, the Younger Dryas--Holocene boundary should have been recorded in the investigated profile, likely with a hiatus, whose occurrence is supported by an increase in gypsum crystals in coarse detritus gyttja (Fig.
The research focuses on the Younger Dryas, a cooling period that started when the North Atlantic current stopped circulating.
Two studies in the Journal of Geology describe samples taken (http://www.journals.uchicago.edu/doi/10.1086/695703) from ice and (http://www.journals.uchicago.edu/doi/abs/10.1086/695704) from sediment that back up the impact-driven climate change, a cold period known as the Younger Dryas. According to the researchers, chemical analysis of the samples, formed in the time of the impact event and taken from dozens of sites all over the world, suggests enough fires broke out to cloud the sky and block out the sun, which would have led to the roughly thousand-year cold era.
For decades, scientists speculated that a comet could have caused the drop in temperature that occurred during a period known as the Younger Dryas. This period is crucial in the history of humanity as it is pinpointed as the era during which agricultural practices began and the first Neolithic civilizations made their mark.
This toolkit persists throughout the Younger Dryas and early Holocene.
The results of OSL dating of sand dunes indicate a period of older activity (~14-15 ka) and confirmation of previous work that documented activity during the Younger Dryas cold period (~13-11.5 ka).
The study, of soil from Syria, is the latest to discredit the controversial theory that a cosmic impact triggered the Younger Dryas cold period.
The woody interval spans the Younger Dryas cooling event in the region (~11 000 to 10 000 yBP; Mayle and Cwynar 1995b) and although growth of ice masses is known to have occurred in some areas (Rampton, et al.