Seasonal Oxygen Isotopic Variations in Living Planktonic Foraminifera off Bermuda

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Science  26 Oct 1979:
Vol. 206, Issue 4417, pp. 447-449
DOI: 10.1126/science.206.4417.447


Seasonal variations in the oxygen-18/oxygen-16 ratio of calcite shells of living planktonic foraminifera in the Sargasso Sea off Bermuda are a direct function of surface water temperature. Seasonal occurrence as well as depth habitat are determining factors in the oxygen isotopic composition of planktonic foraminifera. These relationships may be used to determine the seasonal temperature contrast of oceans in the past.