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Thread: Ice Core Data Dating

  1. #1 Ice Core Data Dating 
    Forum Masters Degree Golkarian's Avatar
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    Just wondering how the ice core data about CO2 is dated. Can carbon dating be used? Or do you need to know how much C14/C12 is in the atmosphere at the time (and wouldn't that require ice core data)? Perhaps it just adds a small error to the calculation?


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  3. #2  
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    There's a whole range of dating methods. The easiest to understand is probably direct counting of annual layers, sort of like counting tree rings. This works in places where the layer wasn't melted away; in Vostok Antarctica, for example, there are still clear annual layers at over 1500m deep.

    Where the layers might not be as clear, there are many other methods including isotope ratios of their trapped gases and comparison to known event dates, such as a volcanic dust layer etc.


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  4. #3  
    Forum Masters Degree Golkarian's Avatar
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    Thanks, so is the idea is that extra layers are only added in the winter in some regions?
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  5. #4  
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    Quote Originally Posted by Golkarian
    Thanks, so is the idea is that extra layers are only added in the winter in some regions?
    It's so much in what season during the year the ice is added but whether the summer warmth, rains or sublimation entirely eliminates the layer or not.
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