Isotope sediment dating boundaries of dating book


28-Mar-2014 00:07

In polar ice cores, the measurement is relatively simple: less heavy oxygen in the frozen water means that temperatures were cooler.Oxygen isotopes in ice cores taken from mountain tops closer to the equator are more difficult to measure since heavy oxygen tends to fall near the equator regardless of temperature.At first, the rain contains a higher ratio of water made of heavy oxygen, since those molecules condense more easily than water vapor containing light oxygen.The remaining moisture in the air becomes depleted of heavy oxygen as the air continues to move poleward into colder regions.

Melting returns light oxygen to the water, and reduces the salinity of the oceans worldwide.

Thus, high concentrations of heavy oxygen in the ocean tell scientists that light oxygen was trapped in the ice sheets.



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