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   Posted by Dr. Emanuel on 02/25/2006 at 12:34

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In Reply to: Can you measure hurricanes in the past as far back as million of years or more? How and how far back? Do they leave fingerprints like ice ages do? Were there hurricanes during the partial ice ages? posted by Kat L., Katie K., Rachel S, Abby A. Caroline D. on 02/20/2006 at 16:47:

Good question! There is a technique being developed that might get us back a few hundred thousand years; perhaps a few million years. It makes use of the fact that hurricane rainfall is unusually depleted of a particular isotope of Oxygen (18O). This rain water is, in some places, incorporated into limestone formations such as stalactites in caves. By sectioning such a rock and detecting its 18O content, we might be able to find records of ancient hurricane activity.



  

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