Abstract
Analyses of single shells of Orbulina universa and two other species show ranges of 2‰ in δ 18O and δ 13C at various levels in a box core from the western equatorial Pacific. Seasonal and inter-annual variations can account for only about half of this range; variations in depths of calcification and in metabolic effects must account for the rest. The large range must introduce considerable noise in multi-shell analysis unless the number of shells in the sample is of the order of 50 or more. We did not find a change in the range downcore; nor did we find any evidence for the deglacial “meltwater spike”.
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