Oxygen isotope dating
Since it is lighter than O and can alter their distribution throughout the globe.
In addition to the effects of evaporation and precipitation, the amount of ice near the poles affects the delta-O-18 ratio.
The equation to obtain this value is: Delta-O-18 changes directly as a result of temperature fluctuations, so it provides a very good record of the climate.
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– The laboratory also automatically includes stable oxygen isotope measurements for carbonates in the radiocarbon dating service and offers the service on a standalone basis.
This relationship can be used to calibrate the isotope ratio thermometer, although the calibration changes a little during ice age climates.
Plotting either O or D with depth along the length of an ice core reveals the seasonal oscillations in temperature and researchers can also count annual layers in order to date them.