Discussion
The oxygen isotope ratio in ocean sediment carbonate records mainly
Answer: D
Correct answer: the volume of ice and the temperature
The oxygen isotope ratio in foraminiferal carbonate reflects both the temperature at which the shell formed and the isotopic composition of the seawater, which itself depends on how much light isotope is locked up in ice sheets. Separating the two contributions is the central difficulty of the method, and it is usually done by combining the record with an independent temperature proxy.
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