Ice cores dating

If the date of the eruption is not known, but it can be identified in multiple cores, then dating the ice can in turn give a date for the eruption, which can then be used as a reference layer. These data can be combined to find the climate model that best fits all the available data. IPICS International Partnerships in Ice Core Sciences has produced a series of white papers outlining future challenges and scientific goals for the ice core science community. This flow-thinning means that annual layer counting eventually becomes impossible in all deep cores. This is a result of the high snowfall rate on Law Dome, which leaves a thick layer of snow every year. Ice from Greenland cores contains dust carried by wind; the dust appears most strongly in late winter, and appears as cloudy grey layers.

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The results have to be corrected for the presence of 14 C produced directly in the ice by cosmic rays, and the amount of correction depends strongly on the location of the ice core.

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Australian Antarctic Division: Leading Australia’s Antarctic Program

Environmental and Scientific Stewardship. Many cores however come from regions where the yearly snowfall accumulation is too small for the annual layers to be distinguished, and other methods of dating must be used. Ice core Mass balance. Another complication is that in areas with low accumulation rates, deposition from fog can increase the concentration in the snow, sometimes to the point where the atmospheric concentration could be overestimated by a factor of two. The dashed lines indicate the winter layers and define the annual layers.

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