How Has The Earth's
Climate Changed?
Coral cores may tell the tale.

A coral movie presentation...

4.6 Mb/32 Sec QuickTime

Coral skeleton is composed of calcium carbonate. The skeleton formed in the winter has a different density than that formed in the summer because of variations in growth rates related to temperature and cloud cover conditions. Thus corals exhibit seasonal growth bands very much like those observed in trees. Shown here are two scientists carefully drilling and removing a coral core.

 

 

 

 

 

Clipperton Atoll (10N, 109W): Photos by Maris Kazmers.

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Coral Paleoclimatology website by Heather Benway, NOAA Office of Global Programs, hosted by the NOAA Paleoclimatology Program. Please contact us if you have any comments and/or suggestions.