Dating greenland ice cores

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The Minoan eruption was a major catastrophic volcanic eruption that devastated the Aegean island of Thera now called Santorini in around BCE. Although there are no clear ancient records of the eruption, its plume may have been described in the Egyptian Tempest Stele , [8] and the ensuing volcanic winter coincides with a cold wave mentioned in the Chinese Bamboo Annals. Geological evidence shows the Thera volcano erupted numerous times over several hundred thousand years before the Minoan eruption. In a repeating process, the volcano would violently erupt, then eventually collapse into a roughly circular seawater-filled caldera , with numerous small islands forming the circle. The caldera would slowly refill with magma, building a new volcano, which erupted and then collapsed in an ongoing cyclical process. Immediately before the Minoan eruption, the walls of the caldera formed a nearly continuous ring of islands, with the only entrance between Thera and the tiny island of Aspronisi.
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Core questions: An introduction to ice cores

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Oldest ice-core ever drilled dates back million years

Ice cores from Greenland contain information about climate changes in the past over the Greenland ice sheet and the surrounding areas. Likewise, cores drilled from the sea bed or from the sediments in a lake tell about past temperatures and other climate indicators in the oceans and over continents. The different cores all give their story of the climate of the past from their respective geographical locations, and they agree on one thing: Climate has always been changing. On millennial time scales, the climate oscillates between cold and warm periods. However, one question which is still under investigation is to what degree the climate oscillates in phase all over the Earth or whether there are regional differences during climate shifts. Solving this question is hampered by the uncertainty on the dating of the different records.
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Ice Dynamics, Paleoclimate, and Ice Cores

In , US Army scientists drilled down through nearly a mile of ice in northwestern Greenland -- and pulled up a fifteen-foot-long tube of dirt from the bottom. Then this frozen sediment was lost in a freezer for decades. It was accidentally rediscovered in
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Based on an early Greenland ice core record produced back in , versions of the graph have, variously, mislabeled the x-axis, excluded the modern observational temperature record and conflated a single location in Greenland with the whole world. More recently, researchers have drilled numerous additional ice cores throughout Greenland and produced an updated estimate past Greenland temperatures. This modern temperature reconstruction, combined with observational records over the past century, shows that current temperatures in Greenland are warmer than any period in the past 2, years.
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