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Geology; August 1998; v. 26; no. 8; p. 675-678; DOI: 10.1130/0091-7613(1998)026<0675:OIVCKT>2.3.CO;2
© 1998 Geological Society of America
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Oxygen isotopes versus CLIMAP (18 ka) temperatures: A comparison from the tropical Atlantic

Tobias Wolff1, Stefan Mulitza1, Helge Arz1, Jürgen Pätzold1 and Gerold Wefer1

1 Fachbereich Geowissenschaften, Universität Bremen, 28334 Bremen, Germany

Glacial-interglacial differences in {delta}18O values of Globigerinoides sacculifer have been mapped in the western and central tropical Atlantic using data from surface and core sediments. Glacial-interglacial differences in the western tropical Atlantic, if attributed to temperature changes only, are at odds with temperature reconstructions performed by CLIMAP. In the Ceara Rise region delta {delta}18O values exceeding 2{per thousand} are recorded. They can only be partly attributed to changes in the precipitation-evaporation regime, i.e., higher salinities and 18O-enriched precipitation. An additional cooling of 1–2 °C as compared to CLIMAP's results is required to balance the {delta}18O record. Thus, temperature changes from glacial to modern times amount to 2– 3 °C in the tropical Atlantic off the northern coast of Brazil.




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