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OxygenYes. Scientist look at the ratio of oxygen isotopes that make up the ice to determine temperature at the time the ice (then snow) was laid down. Scientists would expect to see much warmer or much colder temperatures during El Niño events, depending on where the ice core was taken from.More about ice cores: Back to top Anatomy of El Niño | Chasing El Niño | El Niño's Reach Dispatches | Resources | Mail | Site Map | El Niño Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |