Abstract
Glacial-interglacial differences in δ 18 O 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 δ 18 O values exceeding 2‰ are recorded. They can only be partly attributed to changes in the precipitation-evaporation regime, i.e., higher salinities and 18 O-enriched precipitation. An additional cooling of 1–2 °C as compared to CLIMAP9s results is required to balance the δ 18 O 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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