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An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier. Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper, and an ice core contains ice formed over a range of years. Cores are drilled with hand augers for shallow holes or powered drills; they can reach depths of over two miles 3. The physical properties of the ice and of material trapped in it can be used to reconstruct the climate over the age range of the core. The proportions of different oxygen and hydrogen isotopes provide information about ancient temperatures , and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases such as carbon dioxide.
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East Antarctic Ice Sheet could cause sea levels to rise by up to 16 FEET by 2500, study warns

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Cryospheric Sciences | Ice Cores “For Dummies”

Research article 15 Jan Correspondence : F. Adolphi florian. Investigations of past climate dynamics rely on accurate and precise chronologies of the employed climate reconstructions. However, comparisons of climate records anchored on these chronologies are hampered by the precision and accuracy of both timescales. Here we use common variations in the production rates of 14 C and 10 Be recorded in tree-rings and ice cores, respectively, to assess the differences between both timescales during the Holocene.
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Climate records from ice cores

In the period between , and , years ago, Earth's climate was warmer than today. But how much warmer was it and what did the warming do to global sea levels? New research from the NEEM ice core drilling project in Greenland shows that the period was warmer than previously thought. The international research project is led by researchers from the Niels Bohr Institute and the very important results are published in the scientific journal, Nature. In the last millions years Earth's climate has alternated between ice ages lasting about , years and interglacial periods of 10, to 15, years.
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The ash layer is widespread in the North Atlantic region and serves as an important time marker linking ice cores with marine and lake sediment records beyond the range of C dating. According to the Greenland ice-core chronology, the ash layer has an age of 55, years; whereas a recent Ar-Ar dating of the ash layer based on material from Iceland suggests an age of 56, years. In the ice core, the NAAZ II ash layer is one of the most prominent out of a handful of visible ash layers in the , years covered by the ice cores. The brownish ash layer that is a few mm thick appears somewhat reworked in the core with agglomeration of smaller particles.
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