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EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > OXYGEN ISOTOPES
Definition:
Isotopes of oxygen (O-18, O-16, O-13) are found in calcium carbonate in sea
water. The production of O18 is highly dependent on temperature. The oxygen
isotope record in marine sediments varies locally with temperature and globally
with variations in continental ice volume. Oxygen isotope analyses have been
carried out on deep sea cores from areas of calcareous sedimentation throughout
the world and similar variations in O18 are recorded everywhere. The O18 signal
is that of ice volume changes on the continents and concomitant changes in the
isotopic content of the oceans.
Reference:
Bradley, R.S. 1999. Paleoclimatology: Reconstructing Climates of the
Quaternary, 2nd edition. Harcourt Academic Press (especially Chapter 6.3).
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