Ice core dating methods
If there is a lot of snow accumulation each year, the record will provide a lot of detail.
What has so far been discovered with ice core research? In addition, other dating methods using radioactive isotopes and known volcanic horizons can give a precise means of dating the layers.3. The ideal place to drill an ice core is an ice cap or glacier which has very little sideways movement of the ice over time.
In the upper atmosphere, exposure to cosmic rays can transform a stable krypton isotope into a slow-decaying radioactive isotope.
PHOTOS: Using krypton to gauge the age of ancient ice Scientists say that air bubbles in polar ice will contain some of these radioisotopes.
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Find out why ice core research is so important for our understanding of climate change and how we drill and analyse the ice cores. Therefore when the scientists are working in the mountain glaciers of warmer, temperate regions, they like to get the highest, coldest ice they can find.4. The deepest ice cores have been drilled in the polar ice caps – Antarctica and Greenland, reaching a depth of over three kilometres.
Scientists say they have developed a means of accurately dating Earth's oldest and densest polar ice by analyzing the composition of krypton gas trapped within ancient air bubbles.
As the snow accumulates each year it builds up into a sequence of layers that contain a surprising amount of information.
What makes ice cores so useful for climate research?