Which of the following accurately describes 18O/16O ratios of the oceans?
A) During the winter, 16O is high in the ocean; during warmer periods the isotope ratio is lower.
B) The 18O/16O ratio in the ocean is low during the winter because temperatures are too low for 16O to evaporate.
C) The ratio of oceanic 18O/16O in the late summer is high, because the most of the 16O has evaporated by then.
D) Because 18O evaporates more readily than 16O, the oceans have a higher relative abundance of 16O during the summer.
A
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