Methods of dating ice cores

Ice cores from Antarctica, from Greenland, and from a number of smaller glaciers around the world yield a wealth of information on past climates and environments. Ice cores offer unique records on past temperatures, atmospheric composition including greenhouse gases , volcanism, solar activity, dustiness, and biomass burning, among others. In Antarctica, ice cores extend back more than , years before present Jouzel et al. A few ice cores from high-elevation glaciers in the Himalayas Thompson et al. In order to make proper interpretation of ice core records, it is essential to establish accurate and precise ice core chronologies that assign an age to each depth segment of the core.

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Ice Cores and the Age of the Earth

Ice Core Dating

Find out why ice core research is so important for our understanding of climate change and how we drill and analyse the ice cores. For a detailed look at how ice cores are recovered from Antarctica watch this video. Why do scientists drill ice cores? What makes ice cores so useful for climate research? Where do you drill them? How deep are the ice cores drilled? What has so far been discovered with ice core research?
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Core questions: An introduction to ice cores

Ice consists of water molecules made of atoms that come in versions with slightly different mass, so-called isotopes. Variations in the abundance of the heavy isotopes relative to the most common isotopes can be measured and are found to reflect the temperature variations through the year. The graph below shows how the isotopes correlate with the local temperature over a few years in the early s at the GRIP drill site:.
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When archaeologists want to learn about the history of an ancient civilization, they dig deeply into the soil, searching for tools and artifacts to complete the story. The samples they collect from the ice, called ice cores, hold a record of what our planet was like hundreds of thousands of years ago. But where do ice cores come from, and what do they tell us about climate change? In some areas, these layers result in ice sheets that are several miles several kilometers thick.
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